# Maryland ADU Guide

> Independent Maryland ADU rules, costs & planning resources.


## Posts

- [Wicomico County ADU Rules 2026: Bill 2026-08, Size, Parking & October 19 Effective Date](https://marylandaduguide.com/wicomico-county-adu-rules/): Wicomico County enacted Bill 2026-08, but it does not take effect until October 19, 2026. See the current rules, 50% size conflict, parking requirements, setbacks, Salisbury carve-out and septic/Critical Area checks.
- [St. Mary’s County ADU Rules 2026: Size, Owner Occupancy, Parking & Septic](https://marylandaduguide.com/st-marys-county-adu-rules/): St. Mary’s County still publishes legacy accessory-apartment rules that conflict with Maryland’s 2026 ADU baseline on size and parking. See what is verified now, what needs local confirmation, and how septic and Critical Area rules can affect feasibility.
- [Calvert County ADU Rules 2026: 75% Size Rule, Parking Waiver, Owner Occupancy & Permits](https://marylandaduguide.com/calvert-county-adu-rules/): Calvert County now has an updated ADU framework. See the 75% size rule, owner-occupancy requirement, parking waiver, permit steps, Critical Area issues and the separate rules for Chesapeake Beach and North Beach.
- [Havre de Grace ADU Rules 2026: Current Law & Ordinance 1232](https://marylandaduguide.com/havre-de-grace-adu-rules/): Havre de Grace ADU rules: current size, parking, owner-occupancy and Board approval requirements, plus Ordinances 1229–1233 and the September 21 hearing.
- [Charles County ADU Rules 2026: Enacted Size, Parking, Detached ADUs & Permits](https://marylandaduguide.com/charles-county-adu-rules/): Charles County Bill 2026-06 is enacted and effective August 21, 2026. See the current ADU size rules, detached-unit path, parking, septic/water review, permits and property-specific checks.
- [Harford County ADU Rules 2026: Family-Only Legacy Rules vs. Maryland’s New ADU Standard](https://marylandaduguide.com/harford-county-adu-rules/): Harford County currently allows one attached or interior ADU for a relative, with a 300-sq-ft minimum and a cap of the lesser of 1,500 sq ft or 50% of the main home. Here’s what applies now and what still needs 2026 alignment.
- [Queen Anne’s County ADU Rules 2026: Current 1,500-Sq-Ft Rule & Ordinance 26-15](https://marylandaduguide.com/queen-annes-county-adu-rules/): Queen Anne’s County currently allows one accessory guest residence/apartment up to 1,500 sq ft under §18:1-48. Ordinance 26-15 proposes a new by-right ADU framework for 2026; here’s what applies now and what remains pending.
- [Carroll County ADU Rules 2026: Attached vs Detached, Zoning Districts & Approved Changes](https://marylandaduguide.com/carroll-county-md-adu-rules/): Carroll County’s current ADU rules differ sharply by zoning district. Residential attached units use an 800-sq-ft/one-third formula, Agricultural/Conservation detached units need 3 acres and must be within 50 feet of the main home, while 2026 amendments remain pending.
- [Aberdeen MD ADU Rules 2026: Sept. 14 Amendments & Pending Status](https://marylandaduguide.com/aberdeen-md-adu-rules/): Aberdeen is considering three ADU ordinances on September 14, 2026 covering zoning standards, growth-management exemptions and utility-related fee exemptions. See what the current code says, what is only proposed, and what homeowners should verify now.
- [Will an ADU Increase Property Taxes in Maryland? 2026 Assessment Guide](https://marylandaduguide.com/maryland-adu-property-taxes/): An ADU can increase a Maryland property’s assessment because SDAT considers new improvements and renovations. Learn how reassessment timing, the $100,000 new-construction threshold, Homestead credit rules and local tax rates can affect the bill.
- [Chesapeake Beach ADU Rules 2026: Size, Parking Study, Setbacks & HB 1466 Transition](https://marylandaduguide.com/chesapeake-beach-adu-rules/): Chesapeake Beach has its own ADU zoning rules separate from Calvert County. Compare the current 650-sq-ft legacy cap, owner occupancy, parking conflict, 5-ft accessory-building setback, 2026 draft changes and HB 1466 transition.
- [Annapolis ADU Rules 2026: 850-Sq-Ft Limit, Historic Districts & HB 1466 Transition](https://marylandaduguide.com/annapolis-adu-rules/): Annapolis has its own ADU zoning rules separate from Anne Arundel County. Compare the current 850-sq-ft rule, owner occupancy, special exceptions, parking, stormwater, historic-district review and the 2026 HB 1466 transition.
- [Frederick City vs. Walkersville ADU Rules 2026: Municipal Carve-Outs Explained](https://marylandaduguide.com/frederick-city-walkersville-adu-rules/): A Frederick, MD mailing address does not tell you which ADU zoning rules apply. Compare unincorporated Frederick County, the City of Frederick and Walkersville across size, parking, setbacks, owner occupancy and permit responsibility.
- [Maryland ADU Setback Requirements 2026: Side & Rear Rules by County](https://marylandaduguide.com/maryland-adu-setback-rules/): Maryland has no single ADU setback number. State law generally caps side/rear ADU setbacks at the local accessory-structure setback. Compare current county examples including 2½-ft, 5-ft, 6-ft and district-specific rules.
- [Baltimore City ADU Rules 2026: Rowhouses, Carriage Houses, CHAP & HB 1466](https://marylandaduguide.com/baltimore-city-adu-rules/): Baltimore City has its own ADU legislation, zoning code, carriage-house rules, parking law and CHAP historic-district review. Track Council Bill 26-0195, the 75% size proposal, rowhouse limits and what homeowners should verify before October 1, 2026.
- [Frederick County ADU Rules 2026: Permits, 1,000-Sq-Ft Rule & Bill 26-15](https://marylandaduguide.com/frederick-county-adu-rules/): Frederick County uses a 1,000-sq-ft threshold: smaller ADUs follow the permitted pathway and larger units require a special exception. See owner occupancy, parking, septic, impact fees and pending Bill 26-15.
- [Do I Need Extra Parking for an ADU in Maryland? 2026 County-by-County Rules](https://marylandaduguide.com/maryland-adu-parking-rules/): Maryland ADU parking rules changed under HB 1466. See which counties require extra parking, where a parking study has been located, whether a waiver exists, and which jurisdictions are still in transition.
- [Maryland Garage Conversion ADU Rules 2026: Attached vs Detached, Permits & Costs](https://marylandaduguide.com/maryland-garage-conversion-adu/): Yes, a Maryland garage can potentially become an ADU—but attached and detached garages follow different zoning paths. Check permits, setbacks, size, fire separation, utilities and county rules before converting.
- [Maryland ADU Deadline: What Happens If Your County Isn’t Ready by October 1, 2026?](https://marylandaduguide.com/maryland-adu-october-1-deadline/): Maryland jurisdictions must adopt local ADU laws by October 1, 2026 under HB 1466. Here is what the deadline actually requires, what the statute does not say happens on October 2, and how homeowners can navigate a county still in transition.
- [Anne Arundel County ADU Rules 2026: Size, Parking, Permits & Bill 61-26](https://marylandaduguide.com/anne-arundel-county-adu-rules/): Anne Arundel currently allows interior, attached and detached ADUs with no additional parking. See the 800-sq-ft/50% detached cap, setbacks, permits and pending Bill 61-26 before paying for plans.
- [Why Maryland ADU Costs Escalate: From Headline Quote to All-In Project Budget](https://marylandaduguide.com/maryland-adu-cost-escalation/): Why a Maryland ADU builder or prefab quote can be far below the final project budget, with a scope-gap checker for site work, utilities, septic, delivery, permits and other exclusions.
- [How to Hire a Maryland ADU Architect: 12 Questions Before You Pay for Plans](https://marylandaduguide.com/hiring-maryland-adu-architect/): A Maryland-specific screening guide for hiring an ADU architect or design-build firm before paying for plans.
- [Maryland ADU vs. Assisted Living Cost Planner](https://marylandaduguide.com/maryland-adu-vs-assisted-living/): Compare the cash outlay of a Maryland ADU with assisted living using your own ADU budget, in-home care needs and the latest verified Maryland assisted-living median. The tool keeps housing and care costs separate.
- [Baltimore County ADU Rules 2026: Permits, Size & HB 1466 Transition](https://marylandaduguide.com/baltimore-county-adu-rules/): Baltimore County still uses its legacy accessory-apartment framework: interior units use a Use Permit, detached units require a Special Hearing plus Use Permit, and BCZR 400.4 sets current size and family-occupancy rules while the 2026 HB 1466 transition remains unresolved.
- [How to Finance an ADU in Maryland: HELOCs, Loans & Cash-Out Refinancing](https://marylandaduguide.com/financing-maryland-adu/): Compare HELOCs, home equity loans, cash-out refinancing, FHA 203(k) and Fannie Mae HomeStyle Renovation for Maryland ADU projects, with Maryland-specific cautions and lender questions.
- [Maryland ADU Costs 2026: Budget Calculator & Contractor Bid Comparison](https://marylandaduguide.com/maryland-adu-costs/): Plan a Maryland ADU budget with transparent editable assumptions, compare published Maryland cost ranges, and score contractor bids for missing scope before you sign.
- [Maryland ADU Builders & Prefab Options: Modular, Site-Built & Turnkey Companies](https://marylandaduguide.com/maryland-adu-builders-prefab/): Compare Maryland ADU builders, modular providers and prefab kit options. See service scope, company-published pricing, Maryland licensing details and the questions to ask before signing a contract.
- [Maryland ADU Septic & Well Requirements 2026: Capacity, Perc Tests & Reserve Areas](https://marylandaduguide.com/maryland-adu-septic-well-rules/): An ADU may be possible on private septic and well in Maryland, but capacity is not automatic. Check bedroom load, reserve area, perc/water-table testing, well setbacks and Health Department review before paying for plans.
- [How Big Can an ADU Be in Maryland? 75% Rule & County Size Limits](https://marylandaduguide.com/how-to-measure-adu-size-maryland/): How big can an ADU be in Maryland? Learn the 75% state rule, why Howard County uses exterior footprint, how Montgomery and Anne Arundel differ, and how to use SDAT without mistaking assessment data for a zoning measurement.
- [Prince George’s County ADU Rules 2026: Status, Permits & Pending Bills](https://marylandaduguide.com/prince-georges-county-adu-rules/): PG County is still finalizing its 2026 ADU rules through CB-074 and CB-092. See the current legislative status, municipal/jurisdiction issues and what homeowners should verify before buying plans.
- [Montgomery County ADU Rules 2026: Size, Parking, Permits & ZTA 26-06](https://marylandaduguide.com/montgomery-county-adu-rules/): Montgomery County’s 2019 ADU framework remains active while ZTA 26-06 moves through the 2026 legislative process. Compare current size, parking, transit and approval rules with the proposed changes.
- [Howard County ADU Rules 2026: 75% Footprint, Owner Occupancy & No Short-Term Rentals](https://marylandaduguide.com/howard-county-adu-rules/): Howard County’s CB 3-2026 is effective. Learn the 75% exterior-footprint size rule, owner-occupancy requirement, short-term-rental ban, $25 application and the parking issue homeowners should verify before designing.
- [Maryland ADU HOA Rules: Can Your HOA Block an ADU?](https://marylandaduguide.com/maryland-adu-hoa-rules/): Maryland HB 1466 limits HOA restrictions on ADUs but does not eliminate HOA authority. Learn what counts as an unreasonable limitation, what HOAs may still regulate, and how voting and assessments work.
- [Maryland ADU Guide 2026: HB 1466 Rules, Size, Setbacks & Local Requirements](https://marylandaduguide.com/maryland-adu-guide/): A primary-source guide to Maryland HB 1466: ADU size, local approval, setbacks, parking, HOA rules, utilities, property taxes and real homeowner questions ahead of the October 1, 2026 local-law deadline.
- [Building an ADU for Aging Parents in Maryland: Planning Guide (2026)](https://marylandaduguide.com/maryland-adu-for-aging-parents/): Planning a Maryland ADU for a parent? Check property feasibility, ADU type, accessibility, septic and utilities, future rental use, budget and care needs before paying for plans.
- [Buying a Maryland Home for an ADU: 12 Due-Diligence Checks Before You Make an Offer](https://marylandaduguide.com/buying-maryland-home-for-adu-due-diligence/): Buying a Maryland property because you want to add an ADU? Check jurisdiction, zoning, surveys, setbacks, septic, utilities, overlays, HOA rules and rental restrictions before you make an offer.
- [Who Reviews a Maryland ADU? Zoning, Building, Health and Utility Approvals Explained](https://marylandaduguide.com/maryland-adu-approvals-zoning-building-health-utilities/): One of the easiest ADU mistakes is asking a single office, “Can I build this?” and treating the answer as approval of the whole project. Maryland ADUs can involve several review tracks. Zoning can answer one question while building, Environmental Health or a utility answers another. The exact offices vary by property. This guide explains ... Read more
- [Maryland ADU Permit Checklist: What to Gather Before You Apply](https://marylandaduguide.com/maryland-adu-permit-application-checklist/): An ADU permit package in Maryland is not one universal form. Zoning, building, health and utility review can be handled differently by each county or municipality. The useful approach is to assemble the property evidence first, then confirm the exact submission list with the authority that reviews your address. Maryland’s ADU law requires local governments ... Read more
- [Can You Build an ADU on Vacant Land in Maryland? What the State ADU Law Actually Covers](https://marylandaduguide.com/maryland-adu-vacant-land-primary-home-requirement/): Short answer: Maryland’s statewide ADU framework is written for an accessory dwelling unit on the same lot, parcel, or tract as a primary single-family detached dwelling. A vacant lot with no primary dwelling does not fit that state ADU definition. That does not mean a vacant parcel can never be developed with more than one ... Read more
- [Maryland ADU Construction Contract Checklist: What to Check Before You Sign](https://marylandaduguide.com/maryland-adu-construction-contract-checklist/): Quick answer: Before signing a Maryland ADU construction contract, verify the contractor’s current Maryland licensing, make sure the written agreement identifies the exact contracting entity and scope, and check that design, permits, site work, utilities, allowances, payment milestones, change orders and project closeout are addressed in writing. Maryland Home Improvement Commission (MHIC) rules also impose ... Read more
- [Montgomery County Bill 41-26: ADU Owner-Occupancy & Fee Changes](https://marylandaduguide.com/montgomery-county-bill-41-26-adu-owner-occupancy-fees/): Montgomery County Bill 41-26 would remove the ADU rental-license owner-occupancy requirement and create fee relief for qualifying affordable ADUs. Track what is proposed, what applies now, and the October 6, 2026 hearing.
- [Maryland ADUs in Historic Districts: HB 1466, Design Review & HB 1236](https://marylandaduguide.com/maryland-adu-historic-district-rules/): Quick answer: Historic status does not create one simple statewide “yes” or “no” answer for a Maryland ADU. A property can be eligible for an ADU under HB 1466 and still need separate historic-preservation review. The first question is what kind of historic status applies: a local historic district, an individually designated local landmark, a ... Read more
- [Maryland ADUs in the Critical Area: 900 Sq Ft, Buffers & Lot Coverage](https://marylandaduguide.com/maryland-adu-critical-area-rules/): Quick answer: A Maryland property can be eligible for an ADU and still face a separate Chesapeake Bay or Atlantic Coastal Bays Critical Area review. The most important first step is to determine whether the parcel is inside the Critical Area and, if so, whether it is classified as an IDA, LDA or RCA. The ... Read more
- [Existing Maryland ADUs After HB 1466: Legal, Nonconforming & Unpermitted Units](https://marylandaduguide.com/existing-unpermitted-maryland-adu-hb-1466/): Quick answer: HB 1466 does not automatically legalize an old or unpermitted Maryland ADU, and it does not spell out a statewide rule for every ADU that existed before a new local ordinance. Maryland Department of Planning says HB 1466 is silent on existing ADUs and recommends that local governments recognize legally existing ADUs when ... Read more
- [Maryland ADU Building Code 2026: Fire Sprinklers, Separation & Egress](https://marylandaduguide.com/maryland-adu-building-code-fire-sprinklers/): Quick answer: Maryland’s statewide ADU law does not waive building or fire-safety requirements. Maryland Department of Planning says state law requires residential fire sprinkler systems in newly constructed one- and two-family dwellings, which includes newly constructed ADUs. Existing-house conversions, garage conversions, manufactured homes and attached ADUs can follow different code paths, and local building departments ... Read more
- [Chevy Chase View MD ADU Rules 2026: Ordinance 105, 75% Size, 7-Ft Setbacks & No Extra Parking](https://marylandaduguide.com/chevy-chase-view-md-adu-rules/): Chevy Chase View adopted Ordinance 105 in July 2026 to bring its ADU rules into compliance with Maryland law. The ordinance removes the old 15-ft/25-ft detached-ADU setbacks, uses ordinary accessory-building setbacks with height/length modifiers, removes the extra ADU parking requirement, and caps ADUs below 75% of the main building. See the Town and Montgomery County permit path before building.
- [Town of Somerset MD ADU Rules 2026: Town Permit, Setback Formula, Parking & County Approval](https://marylandaduguide.com/town-of-somerset-md-adu-rules/): The Town of Somerset requires its own ADU permit in addition to Montgomery County approvals. Current Town rules use height- and length-based accessory-building setbacks, a one-space ADU parking rule, rear-yard coverage limits and Town Council review. See how Town and County requirements interact before planning an ADU.
- [Town of Chevy Chase MD ADU Rules 2026: Ordinance 26-03, 75% Size & New Setbacks](https://marylandaduguide.com/town-of-chevy-chase-md-adu-rules/): The Town of Chevy Chase adopted Ordinance 26-03 on July 8, 2026, effective August 7, revising ADU setbacks to match ordinary accessory-building rules and setting a 75% size limit. See interior/corner-lot setbacks, height/length increases, rear-yard coverage, nonconforming structures and the Town/Montgomery County permit split.
- [Garrett Park MD ADU Rules 2026: Ordinance 2026-7, No Special ADU Parking & Sept. 28 Vote](https://marylandaduguide.com/garrett-park-md-adu-rules/): Garrett Park introduced Ordinance 2026-7 on September 14, 2026 to bring Town accessory-building and parking rules into compliance with Maryland’s ADU law. The Town declined an ADU traffic study, so the proposal avoids a special ADU parking requirement. See current 5-ft setbacks, privacy/lighting changes, the Sept. 28 adoption meeting and what homeowners should verify.
- [Laytonsville MD ADU Rules 2026: Draft Ordinance 03-26, Sept. 1 Hearing & Historic District Review](https://marylandaduguide.com/laytonsville-md-adu-rules/): Laytonsville held a September 1, 2026 public hearing on Draft Ordinance 03-26 to bring its zoning code into compliance with Maryland’s ADU law. See what is confirmed, what the older zoning code says, how historic-district review fits in, and what homeowners should verify before planning an ADU.
- [Smithsburg MD ADU Rules 2026: Accessory Apartments, Detached Units, Water Fees & State-Law Transition](https://marylandaduguide.com/smithsburg-md-adu-rules/): Smithsburg’s current code defines accessory apartments as internal, attached or detached second dwellings and Maryland’s ADU inventory documents them in TR/TC with special-exception treatment in SR. See setback, height, parking, water-allocation and 2026 state-law issues to verify before building.
- [Sharpsburg MD ADU Rules 2026: 5-Ft Setback, Detached-Unit Gap & State-Law Transition](https://marylandaduguide.com/sharpsburg-md-adu-rules/): Sharpsburg’s current zoning ordinance says an accessory building does not include a separate detached living unit, while Town records show officials began working on HB 1466 ADU zoning amendments in 2025. See the 5-ft accessory-structure setback, current zoning baseline, and what homeowners should verify before planning an ADU.
- [Keedysville MD ADU Rules 2026: Oct. 7 Hearing, 5-Ft Setback Benchmark & What to Verify](https://marylandaduguide.com/keedysville-md-adu-rules/): Keedysville posted a September 18 notice for an October 7, 2026 public hearing on a zoning amendment to permit and regulate ADUs. See the Town’s current accessory-building setback and height rules, Maryland’s 75% standard, and what homeowners should verify before planning an ADU.
- [Taneytown MD ADU Rules 2026: Ordinance 10-2026 Adopted Sept. 14 & What Homeowners Should Verify](https://marylandaduguide.com/taneytown-md-adu-rules/): Taneytown adopted Ordinance 10-2026 on September 14, 2026 to authorize accessory dwelling units on lots with existing single-family detached homes. See the current accessory-building setbacks, Maryland’s 75% rule, parking-study context, permit path and what homeowners should confirm before building.
- [Westminster MD ADU Rules 2026: Water Allocation, Real ADU Approvals & What Zoning Still Needs to Clarify](https://marylandaduguide.com/westminster-md-adu-rules/): Westminster has approved real ADUs through its water/sewer allocation process, including projects at Bond Street and Kate Wagner Court, but its current zoning code does not surface a clean dedicated ADU section. See what homeowners should verify about zoning, water capacity, setbacks, permits and rental licensing.
- [New Windsor MD ADU Rules 2026: 1/3 / 800 Sq Ft Cap, R-1/R-2 Conditional Use & State-Law Conflict](https://marylandaduguide.com/new-windsor-md-adu-rules/): New Windsor already allows ADUs as conditional uses in R-1 and R-2 and permits attached or detached units within 100 feet of the main house, but its one-third / 800-sq-ft cap conflicts with Maryland’s current 75% ADU standard. See owner occupancy, outbuilding, conversion and rental-license rules to verify before building.
- [Mount Airy MD ADU Rules 2026: 30% Family Apartment Rule, Pre-1951 Accessory Apartments & State-Law Conflict](https://marylandaduguide.com/mount-airy-md-adu-rules/): Mount Airy’s current code has two older ADU-type pathways: a 30% family-apartment rule and an accessory-apartment rule limited to older homes, while a separate provision treats garage residences as accessory apartments. See what homeowners should verify under Maryland’s 2026 ADU law.
- [Hampstead MD ADU Rules 2026: Ordinance 561, 800 Sq Ft Cap, Parking & Sept. 8 Hearing](https://marylandaduguide.com/hampstead-md-adu-rules/): Hampstead introduced Ordinance 561 to create ADU rules and held a public hearing September 8, 2026. The proposal uses an 800-sq-ft / 50% cap, 7,500-sq-ft minimum lot, owner occupancy, 10-ft setbacks and two extra parking spaces. See what is proposed, what current accessory-building rules say, and what homeowners should verify before building.
- [Manchester MD ADU Rules 2026: Ordinance 276, Oct. 13 Hearing & Current Accessory-Structure Ban](https://marylandaduguide.com/manchester-md-adu-rules/): Manchester introduced Ordinance 276 on September 8, 2026 to add and regulate ADUs, with a public hearing set for October 13. See what the Town’s current code says now, what the proposal is meant to change, and what homeowners should verify before planning an ADU.
- [Pocomoke City MD ADU Rules 2026: Ordinance 2027-O-1, Sept. 28 Hearing & What Applies Now](https://marylandaduguide.com/pocomoke-city-md-adu-rules/): Pocomoke City introduced Ordinance 2027-O-1 on September 8, 2026 to create ADU regulations, with a public hearing scheduled for September 28. See what the City has officially confirmed, what the current zoning code says now, and what homeowners should verify before planning an ADU.
- [Snow Hill MD ADU Rules 2026: 50% / 800 Sq Ft Cap, R-1/R-2, Historic & Critical Area](https://marylandaduguide.com/snow-hill-md-adu-rules/): Snow Hill allows ADUs in R-1 and R-2, including internal conversions, additions, standalone units and garage additions, but its 50% / 800-sq-ft cap conflicts with Maryland’s current 75% ADU standard. See parking, setbacks, Historic District, Critical Area and permit rules to verify before building.
- [Goldsboro MD ADU Rules 2026: 50% / 800 Sq Ft Cap, Detached Units & HB 1466 Conflict](https://marylandaduguide.com/goldsboro-md-adu-rules/): Goldsboro’s 2022 zoning ordinance has a detailed ADU section allowing internal conversions, garage conversions, additions and detached units, but its 50% / 800-sq-ft maximum conflicts with Maryland’s current 75% ADU standard. See the local districts, setbacks, parking language and permit checks to verify before building.
- [Ridgely MD ADU Rules 2026: R-3 ADU Zoning Signal, Rental Registration & What to Verify](https://marylandaduguide.com/ridgely-md-adu-rules/): Ridgely’s current planning page warns that online zoning may not include recent updates, while a September 2025 Town workshop document describes R-3 as including single-family homes with ADUs. See what is verified, what remains unclear, and what homeowners should ask the Town before planning an ADU.
- [Preston MD ADU Rules 2026: 50% / 1,500 Sq Ft Overlay Rule, Special Exception & State-Law Conflict](https://marylandaduguide.com/preston-md-adu-rules/): Preston’s current zoning code allows ADUs by special exception in its Village Overlay / Redevelopment areas, capped at 50% of the principal structure and 1,500 sq ft. That 50% limit now conflicts with Maryland’s 2026 75% ADU standard. See what homeowners should verify before applying.
- [Federalsburg MD ADU Rules 2026: Critical Area 900 Sq Ft Rule, Tiny Houses & State Deadline](https://marylandaduguide.com/federalsburg-md-adu-rules/): Federalsburg’s current code expressly regulates ADUs in the Chesapeake Bay Critical Area, including a 100-foot / 900-sq-ft RCA standard, but its general zoning code does not surface a clear townwide ADU category. See what homeowners should verify under Maryland’s 2026 ADU law.
- [Greensboro MD ADU Rules 2026: 500/800 Sq Ft Legacy Rules, Parking & HB 1466](https://marylandaduguide.com/greensboro-md-adu-rules/): Greensboro’s published zoning ordinance contains two different accessory-apartment standards: one uses a 33%/800-sq-ft cap and four parking spaces, while another uses 500 sq ft, internal conversion only, owner occupancy and no extra parking. See what homeowners should verify under Maryland’s 2026 ADU law.
- [Betterton MD ADU Rules 2026: No Final ADU Ordinance Found, Critical Area & Permit Checks](https://marylandaduguide.com/betterton-md-adu-rules/): Betterton has a 2025 zoning ordinance and a new 2026 Comprehensive Plan, but we did not find a separately posted final HB 1466 ADU ordinance in the Town’s current public library. See what homeowners can verify now, including Critical Area, permits, water/sewer and the October 1 state deadline.
- [Chestertown MD ADU Rules 2026: 50% Size Rule, 1-Bedroom Cap, Historic Review & State-Law Conflict](https://marylandaduguide.com/chestertown-md-adu-rules/): Chestertown allows attached and detached ADUs in R-3 through R-6, but its March 2026 zoning code still uses a 50% / 2,000-sq-ft formula, one-bedroom cap, two-family lot-area threshold and owner-occupancy rule. See what homeowners should verify before applying under Maryland’s 2026 ADU framework.
- [Millington MD ADU Rules 2026: 60% / 1,000 Sq Ft Cap, Parking & Two-County Permit Check](https://marylandaduguide.com/millington-md-adu-rules/): Millington’s July 2025 zoning amendment allows internal, attached, detached and accessory-building ADUs, but its 60% / 1,000-sq-ft maximum is more restrictive than Maryland’s 2026 75% standard. See what applies now and what homeowners should verify.
- [Galena MD ADU Rules 2026: Proposed Ordinance 2026-09 & What Applies Now](https://marylandaduguide.com/galena-md-adu-rules/): Galena has posted Proposed Unsigned Ordinance 2026-09 for accessory dwelling units, while its existing zoning ordinance already includes an accessory-apartment category. See what is confirmed now, what remains proposed, and what homeowners should verify before planning an ADU.
- [Burkittsville MD ADU Rules 2026: New Ordinance Passed Sept. 15, Septic & Historic Checks](https://marylandaduguide.com/burkittsville-md-adu-rules/): Burkittsville announced passage of a new ADU ordinance on September 15, 2026. See what is confirmed, what the public ordinance viewer does not yet make easy to verify, and the septic, historic and permit checks homeowners should complete before planning an ADU.
- [Port Deposit MD ADU Rules 2026: 30% Legacy Cap, Historic Review & Critical Area](https://marylandaduguide.com/port-deposit-md-adu-rules/): Port Deposit already regulates ADUs in ST, RM and CCD districts, but its 30% legacy size cap conflicts with Maryland’s 2026 ADU standard. See the Town rules, historic review, Critical Area limits and permit path to verify before building.
- [Perryville MD ADU Rules 2026: 25% Legacy Cap, Critical Area & Permit Process](https://marylandaduguide.com/perryville-md-adu-rules/): Perryville’s current zoning ordinance still defines an accessory apartment at 25% of the primary building or 750 sq ft, while Maryland’s 2026 ADU framework requires a less restrictive size standard. See what homeowners should verify before applying.
- [Charlestown MD ADU Rules 2026: Critical Area, Historic Review & State Deadline](https://marylandaduguide.com/charlestown-md-adu-rules/): Charlestown’s 2025 Comprehensive Plan calls for a zoning update to allow ADUs, while its Critical Area code already contains a 900-sq-ft RCA accessory-dwelling standard. See what homeowners should verify before applying.
- [Rising Sun MD ADU Rules 2026: Special Exception, 30% Legacy Cap & State-Law Change](https://marylandaduguide.com/rising-sun-md-adu-rules/): Rising Sun already allows accessory apartments by special exception, but its legacy 30% internal-unit size cap is tighter than Maryland’s 2026 ADU standard. See what homeowners should verify before planning an ADU.
- [Maryland ADU Privacy & Soundproofing: Entrances, Windows, Walls & Noise Control](https://marylandaduguide.com/maryland-adu-privacy-soundproofing/): Plan ADU privacy before construction with practical guidance on entrances, windows, shared walls, floor/ceiling sound control, plumbing noise, landscaping and mechanical equipment.
- [Maryland ADU Appraisal & Resale Value: What Appraisers and Lenders Look For](https://marylandaduguide.com/maryland-adu-appraisal-resale-value/): Learn how a legal ADU may affect appraisal, comparable sales, market rent, financing and resale in Maryland—and why there is no fixed value-add percentage.
- [Maryland ADU Cost Breakdown: Where the Project Budget Actually Goes](https://marylandaduguide.com/maryland-adu-cost-breakdown/): Break a Maryland ADU budget into design, site work, foundation, structure, MEP, interiors, kitchen/bath, utilities and closeout with an editable bid-anatomy calculator.
- [Maryland ADU Construction Timeline: From Site Work to Final Inspection](https://marylandaduguide.com/maryland-adu-construction-timeline/): See the practical ADU build sequence in Maryland from site prep and foundation through framing, MEP rough-ins, insulation, finishes, trade finals and final inspection.
- [Maryland ADU Floor Plans: 400, 600, 800 & 1,000 Sq Ft Layout Guide](https://marylandaduguide.com/maryland-adu-floor-plans/): Compare 400, 600, 800 and 1,000 sq ft Maryland ADU layouts with original planning diagrams, room-by-room tradeoffs and checks to make before paying for final plans.
- [Maryland ADU Site Plan Guide 2026: What to Show Before You Apply](https://marylandaduguide.com/maryland-adu-site-plan-guide/): Learn what a Maryland ADU site plan should show, with an original annotated example covering setbacks, property lines, easements, septic, utilities, parking and the buildable area.
- [Thurmont MD ADU Rules 2026: Town Zoning, State Deadline & What to Verify](https://marylandaduguide.com/thurmont-md-adu-rules/): Thurmont has its own zoning authority and Maryland’s October 1, 2026 ADU deadline is approaching. Learn what the Town currently says, what is still unclear, and what homeowners should verify before buying plans.
- [Middletown MD ADU Rules 2026: Town Zoning, County Permits & Rental Licensing](https://marylandaduguide.com/middletown-md-adu-rules/): Middletown administers its own zoning while Frederick County handles most building permits. Learn the 2026 ADU transition, zoning-certificate process, review timing, rental licensing and what to verify before buying plans.
- [Chesapeake City MD ADU Rules 2026: New Zoning Code, Historic District & Permits](https://marylandaduguide.com/chesapeake-city-md-adu-rules/): Chesapeake City adopted an entirely new zoning ordinance on September 15, 2026. Learn why older zoning materials may be stale and what ADU homeowners should verify about Planning Commission, Historic District, Critical Area, floodplain and site-plan requirements.
- [Rock Hall MD ADU Rules 2026: 850-Sq-Ft Cap, Parking, Setbacks & Rentals](https://marylandaduguide.com/rock-hall-md-adu-rules/): Rock Hall has detailed ADU standards covering detached units, an 850-sq-ft/50% size cap, one bedroom, owner occupancy, parking, setbacks and 90-day rentals. See what needs a 2026 state-law recheck.
- [North East MD ADU Rules 2026: Section 6-27, Special Exceptions & Permits](https://marylandaduguide.com/north-east-md-adu-rules/): North East has a dedicated ADU ordinance in §6-27. Learn the R-1/R-2 Special Exception route, R-4 Planning Commission approval, one-ADU limit, Town-to-County permit sequence and 2026 issues to verify.
- [Brunswick MD ADU Rules 2026: ZTA 26-02, Size, Parking & Detached Units](https://marylandaduguide.com/brunswick-md-adu-rules/): Brunswick is updating its ADU zoning through ZTA 26-02. Learn the 2026 status, Frederick County vs City jurisdiction, detached-unit and parking checks, and what to verify before buying plans.
- [Indian Head MD ADU Rules 2026: Draft 06-01-26, Size, Garage Units & Rentals](https://marylandaduguide.com/indian-head-md-adu-rules/): Indian Head already has detailed accessory-apartment rules and now lists Draft Ordinance 06-01-26 for ADUs. Learn the legacy 30% internal-unit cap, accessory-building rules, owner occupancy, utilities and what to verify in 2026.
- [New Market MD ADU Rules 2026: Ordinance 2026-05, Zoning & Utilities](https://marylandaduguide.com/new-market-md-adu-rules/): New Market is actively updating its ADU rules through Ordinance 2026-05. Learn the latest September 2026 status, Town zoning, Frederick County water/sewer split and what to verify before buying ADU plans.
- [La Plata MD ADU Rules 2026: Ordinance 26-20, Permits, Fees & Rentals](https://marylandaduguide.com/la-plata-md-adu-rules/): La Plata adopted Ordinance 26-20 for accessory dwelling units in 2026. Learn the Town permit, occupancy, utility/facility-fee, detached-unit and rental checks homeowners should complete before buying plans.
- [Berlin MD ADU Rules 2026: Draft Ordinance 2026-07, Size, Amnesty & Parking](https://marylandaduguide.com/berlin-md-adu-rules/): Berlin’s draft Ordinance 2026-07 proposes detailed ADU rules for size, owner occupancy, parking, historic properties, utilities and an amnesty pathway for older units. See what is proposed and what homeowners should verify before acting.
- [Elkton MD ADU Rules 2026: Special Exception, 30% Legacy Cap, Critical Area & Permits](https://marylandaduguide.com/elkton-md-adu-rules/): Elkton’s legacy accessory-apartment rules require a Special Exception and contain a 30% size cap, while its Critical Area ordinance recognizes ADUs. See the 2026 conflicts, permits and parcel checks before designing.
- [Denton MD ADU Rules 2026: Size, Parking, Garage Conversions & Permits](https://marylandaduguide.com/denton-md-adu-rules/): Denton’s detailed ADU proposal covers basement and attic conversions, detached units, garage conversions, parking and size. Learn the 60%/1,000-sq-ft draft versus Maryland’s 75% standard and what to verify in 2026.
- [Centreville MD ADU Rules 2026: 75% Draft, Parking Waiver, Detached Units & Critical Area](https://marylandaduguide.com/centreville-md-adu-rules/): Centreville is actively rewriting its ADU rules. See the July 2026 draft 75% size standard, parking waiver, owner occupancy, detached-unit rules, Critical Area issues and what to verify before designing.
- [Trappe MD ADU Rules 2026: Zoning, Permits, Rentals & HB 1466](https://marylandaduguide.com/trappe-md-adu-rules/): Trappe has its own zoning, permits, rental licensing and utilities. Learn what homeowners should verify for an ADU under the Town’s 2025 zoning ordinance and Maryland’s 2026 HB 1466 transition.
- [Oxford MD ADU Rules 2026: Critical Area, 900-Sq-Ft Rule, Sewer & Historic Review](https://marylandaduguide.com/oxford-md-adu-rules/): Oxford has its own ADU, Critical Area and Historic District rules. Learn the published RCA 900-sq-ft/100-foot provision, sewer requirement, HB 1466 transition and parcel checks before designing.
- [St. Michaels MD ADU Rules 2026: Size, Setbacks, Garage Conversions & Rentals](https://marylandaduguide.com/st-michaels-md-adu-rules/): St. Michaels has detailed ADU rules for size, owner occupancy, detached units, garage-related ADUs, setbacks, design and short-term rentals. See the 2026 HB 1466 issues to verify before designing.
- [Easton MD ADU Rules 2026: Ordinance 861, Size, Parking & Permits](https://marylandaduguide.com/easton-md-adu-rules/): Easton has its own ADU zoning rules and a major 2026 update underway through Ordinance 861. See what applies now, what is proposed, and what homeowners should verify before spending money.
- [Cambridge MD ADU Rules 2026: Size, Parking, Approval & HB 1466 Transition](https://marylandaduguide.com/cambridge-md-adu-rules/): Cambridge has existing ADU rules, but Maryland HB 1466 creates an important 2026 transition. Learn the old 40% size rule, the state’s 75% standard, parking, Board of Appeals review, owner occupancy and what to verify before designing an ADU.
- [Cheverly ADU Rules 2026: Town + County Permits, Rental License, Lot Coverage & Active ADU Review](https://marylandaduguide.com/cheverly-adu-rules/): Cheverly ADU projects can trigger both Town and Prince George’s County permits, annual Town rental licensing, local accessory-structure and lot-coverage rules, and an active 2026 Town Planning Board review of ADU regulations.
- [District Heights ADU Rules 2026: City Building Permits, Rental License & County ADU Transition](https://marylandaduguide.com/district-heights-adu-rules/): District Heights adds its own building-permit, rental-license and housing-inspection layer on top of Prince George’s County ADU zoning. This guide separates the City process from the County’s still-pending 2026 ADU legislation.
- [New Carrollton ADU Rules 2026: County + City Permits, Annual Rental License & Inspections](https://marylandaduguide.com/new-carrollton-adu-rules/): New Carrollton ADU projects can require both Prince George’s County and City building permits. The City also runs its own inspection process and annual rental licensing, making New Carrollton materially different from a county-only approval path.
- [Mount Rainier ADU Rules 2026: NCOZ, Design Review, City Permits & Rental Licensing](https://marylandaduguide.com/mount-rainier-adu-rules/): Mount Rainier ADU projects require more than checking Prince George’s County zoning. The City adds its own permit and rental-license layer, while the Mount Rainier Neighborhood Conservation Overlay Zone and Design Review Board can affect design, height, accessory structures and variance review.
- [Hyattsville ADU Rules 2026: County Zoning, Rental License, Historic Review & City Policy](https://marylandaduguide.com/hyattsville-adu-rules/): Hyattsville ADU projects follow Prince George’s County zoning and building approval, while the City adds annual rental licensing and inspections, certain local site permits, and coordination with County historic-preservation review.
- [Greenbelt ADU Rules 2026: County Bills, Dual Permits, Rental License & NCO Zone](https://marylandaduguide.com/greenbelt-adu-rules/): Greenbelt homeowners face a distinctive ADU approval stack: Prince George’s County zoning, a City building permit, annual City rental licensing, and for many historic-core properties the Greenbelt Neighborhood Conservation Overlay Zone.
- [Bowie ADU Rules 2026: Prince George’s County Zoning, City Permits & Rental Licensing](https://marylandaduguide.com/bowie-adu-rules/): Bowie homeowners face a two-layer approval system: Prince George’s County controls zoning and construction-code approval, while the City of Bowie adds its own building permit and rental-license requirements. This 2026 guide explains what applies now and what is still changing before Maryland’s October 1 ADU deadline.
- [College Park ADU Rules 2026: County ADU Bills, City Permits, Rentals & Old Town](https://marylandaduguide.com/college-park-adu-rules/): College Park ADU planning requires more than checking Prince George’s County zoning. The City adds its own building permit, rental-occupancy rules and Old Town historic-district review, while County ADU legislation remains in motion in September 2026.
- [Maryland ADU Height Rules 2026: How Tall Can a Detached ADU Be?](https://marylandaduguide.com/maryland-adu-height-rules/): There is no single statewide ADU height limit in Maryland. This guide explains how local accessory-structure rules, detached ADU design, setbacks, lot coverage and 2026 law changes affect how tall an ADU can be.
- [Capitol Heights ADU Rules 2026: Draft ADU Proposal, Size & Parking — What Applies Now?](https://marylandaduguide.com/capitol-heights-adu-rules/): Capitol Heights considered an ADU proposal in 2026, but we could not verify it as adopted law. See what the draft proposed and what homeowners should verify now.
- [Bel Air MD ADU Rules 2026: Current Approval Process & Maryland Deadline](https://marylandaduguide.com/bel-air-md-adu-rules/): Bel Air already recognizes accessory dwelling units, but some residential ADUs require special-development approval. Here is what homeowners should verify before Maryland’s October 1, 2026 deadline.
- [Hagerstown ADU Rules 2026: Proposed 75% Size, No Extra Parking & Alley Limits](https://marylandaduguide.com/hagerstown-adu-rules/): Hagerstown’s proposed ADU rules allow one attached, internal or detached unit up to 75% of the main house with no extra parking—but alley-only access may block a detached ADU.
- [Salisbury ADU Rules 2026: Proposed 75% Standard, Parking & Rental Debate](https://marylandaduguide.com/salisbury-adu-rules/): Salisbury is replacing its restrictive 500-sq-ft accessory-apartment framework for Maryland’s October 1 deadline. See what applies now, what is proposed, and what homeowners must verify.
- [Does a Maryland ADU Get a Separate Address, Mailbox or 911 Address? (2026 Guide)](https://marylandaduguide.com/maryland-adu-separate-address-mailbox-911/): A Maryland ADU does not automatically receive a separate street address. Learn how local addressing rules, Unit B designations, USPS mail delivery and emergency/911 addressing can differ by jurisdiction.
- [Maryland ADU Insurance 2026: What Homeowners Should Check Before Building or Renting](https://marylandaduguide.com/maryland-adu-insurance/): Building or renting an ADU can change the property, liability and rental risks your insurance policy needs to address. Here is a Maryland-focused checklist for talking with your insurer before construction or tenancy begins.
- [Can You Rent an ADU in Maryland? Long-Term Rentals, Airbnb & Short-Term Rental Rules (2026)](https://marylandaduguide.com/maryland-adu-rental-airbnb-short-term-rules/): Maryland law protects the ability to offer many ADUs for rent, but it does not create a statewide right to operate an ADU as an Airbnb or other short-term rental. Here is what homeowners should verify in 2026.
- [Maryland ADU Utilities 2026: Water, Sewer, Meters & Connection Fees](https://marylandaduguide.com/maryland-adu-utilities-water-sewer-meters-connection-fees/): Do Maryland ADUs need separate water or sewer connections? Learn what Maryland’s statewide ADU law says about utility capacity, shared water meters and connection fees—and what homeowners still need to verify locally.
- [The Lot Coverage Bottleneck: Why Your Maryland ADU Footprint Depends on More Than Zoning](https://marylandaduguide.com/maryland-adu-lot-coverage-rules/): Maryland ADU lot coverage rules, impervious area and stormwater review explained—with a worked example, the 5,000-square-foot disturbance distinction and local verification steps.
- [Maryland Basement ADU Conversions: Walk-Out Access, Ceiling Height and Egress](https://marylandaduguide.com/maryland-basement-adu-conversion/): Before converting a walk-out basement into a Maryland ADU, check finished ceiling heights, bedroom escape openings, separation, utilities and the local approval route.
- [Maryland ADU Permits to Completion: A Homeowner’s Step-by-Step Guide](https://marylandaduguide.com/maryland-adu-permits-construction-guide/): Move from ADU plans and applications through review comments, construction inspections, final approvals and handover—with local requirements clearly separated.
- [North Beach ADU Rules 2026: 800-Sq-Ft Cap, Parking & HB 1466 Transition](https://marylandaduguide.com/north-beach-adu-rules/): North Beach has its own municipal accessory-apartment rules. See the current 5,000-sq-ft lot minimum, 800-sq-ft detached cap, parking and owner-occupancy rules, the Calvert County permit split, and the 2026 HB 1466 transition.
- [Laurel ADU Rules 2026: Ordinance 2057 Pending & City Zoning](https://marylandaduguide.com/laurel-adu-rules/): Laurel is actively creating its own ADU rules through Ordinance 2057 / Text Amendment 270. See the September 15, 2026 Planning Commission hearing, current city zoning authority, permit path, and what homeowners should verify before relying on proposed rules.
- [Takoma Park ADU Rules 2026: Montgomery County Zoning, City Permits & Rental Licensing](https://marylandaduguide.com/takoma-park-adu-rules/): Takoma Park does not have its own ADU zoning. Montgomery County controls zoning and building review, while the City adds municipality-letter, tree, stormwater, historic-district and rental-licensing requirements.
- [Gaithersburg ADU Rules 2026: 49% Size Cap, Parking, Setbacks & HB 1466 Conflict](https://marylandaduguide.com/gaithersburg-adu-rules/): Gaithersburg has its own ADU zoning rules separate from Montgomery County. See the current 49% attached-unit cap, detached limits, parking, setbacks, short-term-rental ban and 2026 HB 1466 conflict.
- [Rockville ADU Rules 2026: 75% Size Rule, No Parking Requirement & Owner Occupancy](https://marylandaduguide.com/rockville-adu-rules/): Rockville has its own ADU rules separate from Montgomery County. See the 75% size rule, owner-occupancy requirement, no-parking rule, detached ADU standards, permits and rental licensing.
- [Allegany County ADU Rules 2026: Accessory Apartments, Zoning Split & HB 1466 Transition](https://marylandaduguide.com/allegany-county-adu-rules/): Allegany County’s current zoning code separates residential accessory apartments from commercial/industrial accessory dwelling units. See what applies now, why HB 1466 creates a 2026 transition, and what homeowners should verify before planning an ADU.
- [Kent County ADU Rules 2026: Current Rules, Owner Occupancy, Parking & Town Exceptions](https://marylandaduguide.com/kent-county-adu-rules/): Kent County's current ADU framework allows one accessory dwelling in several County zoning districts. See owner-occupancy, parking, rental, permit and town-jurisdiction rules, plus the remaining HB 1466 parking question.
- [Garrett County ADU Rules 2026: No Countywide Zoning, Deep Creek Rules & HB 1466 Transition](https://marylandaduguide.com/garrett-county-adu-rules/): Garrett County is unique in Maryland because it has no countywide zoning. Learn what applies outside zoned areas, what changes in the Deep Creek Watershed and incorporated towns, and what HB 1466 means for 2026 ADU planning.
- [Dorchester County ADU Rules 2026: 800-Sq-Ft Cap, Owner Occupancy, Parking & HB 1466 Conflict](https://marylandaduguide.com/dorchester-county-adu-rules/): Dorchester County still publishes a legacy accessory-apartment framework with an 800-sq-ft/one-third size cap, owner occupancy and one extra parking space. See how those rules compare with Maryland HB 1466, plus septic, floodplain and Cambridge jurisdiction checks.
- [Caroline County ADU Rules 2026: 50% Size Cap, Owner Occupancy, 30-Day Notice & HB 1466 Conflict](https://marylandaduguide.com/caroline-county-adu-rules/): Caroline County already allows attached, detached and converted ADUs, but its current 50%/1,000-sq-ft framework needs to be reconciled with Maryland HB 1466 before the October 1, 2026 deadline.
- [Washington County ADU Rules 2026: 75% Size Rule, 1,200-Sq-Ft Cap, Parking & Hagerstown Exception](https://marylandaduguide.com/washington-county-adu-rules/): Washington County adopted a dedicated ADU ordinance in 2025. See the 75% size rule, 1,200-sq-ft cap, parking waiver, setbacks, septic review and the separate Hagerstown pathway.
- [Talbot County ADU Rules 2026: Size Limits, Detached Lot Minimums, Parking & HB 1466 Conflict](https://marylandaduguide.com/talbot-county-adu-rules/): Talbot County allows interior and detached accessory dwellings, but current 35%/900-sq-ft interior limits, detached lot-size rules and parking requirements now need to be read alongside Maryland HB 1466.
- [Somerset County ADU Rules 2026: 50% Size Cap, Owner Occupancy, Parking & HB 1466 Conflict](https://marylandaduguide.com/somerset-county-adu-rules/): Somerset County already permits several ADU forms, but its current 50% size cap and owner-occupancy rule must be read alongside Maryland’s 2026 HB 1466 requirements. See current size, parking, Critical Area and municipal considerations.
- [Worcester County ADU Rules 2026: 35% Size Cap, Parking, No Owner-Occupancy Rule & HB 1466 Conflict](https://marylandaduguide.com/worcester-county-adu-rules/): Worcester County already allows accessory apartments, but its published 35%/900-sq-ft size cap and extra-parking rule now conflict with Maryland's 2026 ADU framework. See what applies now, the owner-occupancy change, wastewater rules, municipal carve-outs and what homeowners should verify before spending.
- [Cecil County ADU Rules 2026: Current Accessory-Apartment Limits, HB 1466 Conflict & What to Verify](https://marylandaduguide.com/cecil-county-adu-rules/): Cecil County still publishes an older accessory-apartment framework while Maryland's HB 1466 requires broader ADU standards by October 1, 2026. See the current size, owner-occupancy, parking, septic and municipal-rule issues homeowners should verify now.

## Pages

- [Get Help With Your Maryland ADU Project](https://marylandaduguide.com/maryland-adu-project-help/): Planning a Maryland ADU? Prepare your property information and learn how our homeowner-to-professional matching pilot will work.
- [Maryland ADU 2026 County Framework Status Dataset](https://marylandaduguide.com/maryland-adu-2026-county-status-dataset/): This is a research dataset, not a ranking. It tracks the current county-level ADU framework or 2026 transition status for all 24 Maryland county-level jurisdictions, including Baltimore City. Each row links to an official source and shows when that status was last verified. Dataset snapshot: September 19, 2026 · Coverage: 24 county-level jurisdictions · Underlying ... Read more
- [Terms of Service](https://marylandaduguide.com/terms-of-service/): Last updated: September 17, 2026 These Terms of Service (“Terms”) govern your access to and use of MarylandADUGuide.com and its articles, databases, calculators, checkers, planning tools, downloads, email resources, reader-revenue features, and other services (collectively, the “Site”). By using the Site, you agree to these Terms. If you do not agree, please do not use ... Read more
- [Maryland ADU Builder Directory](https://marylandaduguide.com/maryland-adu-builders-map/): Find Maryland ADU builders, architects, designers and other professionals by county and project type. Listings distinguish independently checked and self-reported information.
- [Maryland ADU Jurisdiction Finder](https://marylandaduguide.com/maryland-adu-jurisdiction-finder/): Identify a Maryland property’s county, municipality and zoning authority, then see the local ADU research record and any details that still need confirmation.
- [Maryland ADU Property Feasibility Checker](https://marylandaduguide.com/maryland-adu-feasibility-checker/): Screen a Maryland ADU project for county status, dwelling type, 75% size, utilities, HOA restrictions and budget readiness before spending.
- [Maryland ADU Planning Tools](https://marylandaduguide.com/maryland-adu-planning-tools/): Plan your Maryland ADU from local jurisdiction and feasibility through size, site constraints, budget and contractor bids. Start with the Maryland ADU Jurisdiction Finder, then build your property verification checklist. The saved workspace needs JavaScript. You can still use the planning guides and links below without saving answers. Use these Maryland ADU planning tools before ... Read more
- [Home](https://marylandaduguide.com/): Maryland ADU planning starts here Understand what’s possible for your Maryland property. Find who reviews your ADU, understand the local rules, and turn property questions into a practical plan. Find Who Reviews My Property → Start with your street address. A mailing city or ZIP code alone may point to the wrong authority. Already started? ... Read more
- [Maryland ADU Rules by County & City: 2026 Tracker](https://marylandaduguide.com/maryland-adu-rules-tracker/): Can you build an ADU in Maryland in 2026? It depends on the county or municipality that controls the property. Some jurisdictions already have enforceable ADU rules, while others are still transitioning before the October 1, 2026 state compliance deadline. Use the status labels below to separate active rules from pending proposals, then open the ... Read more
- [Contact](https://marylandaduguide.com/contact/): Maryland ADU Guide welcomes factual corrections, official-source suggestions, questions about our research, and feedback about homeowner planning resources. Contact: Gijo JohnEmail: gijo.j@marylandaduguide.com Send a correction or source If you believe a Maryland ADU rule, local requirement, fee, process, or government link on this site is outdated or incorrect, please include the page you are referring ... Read more
- [Disclaimer](https://marylandaduguide.com/disclaimer/): Maryland ADU Guide provides general educational and research information about accessory dwelling units, zoning, permitting, costs, planning, and related topics in Maryland. Not professional advice The information on this website is not legal, architectural, engineering, surveying, tax, financial, real-estate, construction, zoning, or other professional advice. Reading this site does not create a professional-client relationship with ... Read more
- [Editorial & Research Policy](https://marylandaduguide.com/editorial-research-policy/): Maryland ADU Guide is built around a simple standard: if a homeowner could make a planning, permitting, or financial decision based on something we publish, the information should be traceable, clearly scoped, and as current as we can reasonably make it. Our source hierarchy We prefer primary government sources over summaries from builders, blogs, forums, ... Read more
- [About Maryland ADU Guide](https://marylandaduguide.com/about/): Maryland ADU Guide is an independent research and planning publication created to help Maryland homeowners understand accessory dwelling unit rules, costs, permits, and project decisions in plain English. We are not a government agency, architecture firm, engineering practice, contractor, law firm, or permit-expediting service. Our role is to organize public information, explain what it means ... Read more
- [Privacy Policy](https://marylandaduguide.com/privacy-policy/): Last updated: September 17, 2026 Maryland ADU Guide (“Maryland ADU Guide,” “we,” “us,” or “our”) respects your privacy. This Privacy Policy explains how information may be collected, used, disclosed, and protected when you visit MarylandADUGuide.com, use our planning tools, submit a form, download a resource, subscribe to communications, or otherwise interact with the website. Maryland ... Read more

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