Last researched: September 18, 2026. Denton deserves its own ADU guide because the Town has been comprehensively rewriting Chapter 128 and published a detailed ADU proposal covering internal conversions, additions, detached units, garage conversions, parking and size. Those Town rules are not the same as Caroline County’s ADU rules.
Important 2026 status: Denton’s published zoning-update materials show a proposed §128-89 with a 60% / 1,000-square-foot size cap. Maryland’s newer HB 1466 framework requires covered local laws to accommodate an ADU up to 75% of the primary detached home. Before paying for plans, confirm which Denton ordinance is currently enacted and which size standard the Town is administering.
Denton ADU rules at a glance
| Question | Denton-specific answer |
|---|---|
| County or Town zoning? | Inside Denton, start with Town Planning & Codes and Chapter 128—not Caroline County’s ADU limits. |
| Number proposed | One ADU per lot. |
| Eligible principal home | Same lot as a detached single-family dwelling. |
| Creation methods | Existing living area/attic/basement conversion, addition, stand-alone unit, or adding to/repurposing an accessory building such as a garage. |
| Published draft size | 60% of principal dwelling living area or 1,000 sq ft, whichever is smaller. Verify 2026 HB 1466 alignment before design. |
| Parking proposal | No additional space if on-street parking is permitted and adequate; otherwise one additional space under the draft framework. |
| Historic District | Exterior changes to properties in Denton’s Historic District can require Historic & Architectural Review Commission approval. |
| Critical Area | Denton publishes a Critical Area map and permit materials; parcel-specific environmental review may apply. |
| Permits | Town Planning & Codes administers building and zoning applications and inspections. |
1. Denton is not Caroline County zoning
If your parcel is inside the Town of Denton, do not automatically apply Caroline County’s 50% accessory-dwelling cap, owner-occupancy language or County process. Denton maintains its own zoning ordinance, maps, Planning Commission, Board of Appeals and permit department.
If the property is outside Town jurisdiction, use our Caroline County ADU Rules guide. Confirm jurisdiction before comparing any numbers.
2. Denton’s proposed ADU rule recognizes four very different project types
Denton’s published draft §128-89 says an ADU may be created by converting existing living area, an attic or basement; adding floor area to the home; constructing a stand-alone unit; or adding onto/repurposing an existing accessory building, including an existing garage.
That is useful because the best Denton ADU may not be a backyard cottage. On a constrained lot, a basement or attic conversion can avoid some detached-building siting issues. A garage conversion, however, still needs zoning and building-code confirmation.
3. The 60% / 1,000-sq-ft draft cap is not a safe final 2026 design number
Denton’s zoning-update presentation states that an ADU could be no larger than 60% of the principal dwelling’s living area or 1,000 square feet, whichever is smaller. The March 2025 Planning Commission draft contains the same basic ADU framework.
Maryland’s subsequent HB 1466 framework requires covered local ADU legislation to accommodate the state’s up-to-75% definition. That means homeowners should not order final plans using Denton’s older 60%/1,000-sq-ft draft without confirming the Town’s current implementation.
Example: 60% of a 1,800-sq-ft home is 1,080 sq ft, so the old draft would cap it at 1,000. Seventy-five percent is 1,350 sq ft—a 350-sq-ft difference. Use our 75% ADU Size Calculator for a planning benchmark, then verify the Town’s enacted rule.
4. Denton’s parking proposal is more nuanced than “one extra space”
The published draft says no additional parking space is required for the ADU where on-street parking is permitted and adequate. Where on-street parking is not feasible, the draft calls for one additional space; the zoning-update summary also notes an additional space when the ADU is constructed simultaneously with the main dwelling.
Because Maryland’s newer law regulates additional ADU parking mandates, ask Planning & Codes what parking standard is currently effective for your address rather than paving a new space based on an older draft.
5. Garage conversion: possible concept, not automatic approval
The draft expressly contemplates repurposing an existing accessory building such as a garage. But an existing garage was not necessarily built to residential standards. A conversion can require review of structural work, insulation/energy code, emergency escape, fire separation, plumbing, electrical, ceiling height and legal setbacks.
Denton’s FAQ confirms that accessory structures themselves require building permits. Bring the existing garage location and dimensions to Planning & Codes before paying for a conversion design.
6. A detached backyard ADU still has to fit the lot
Even when a stand-alone ADU is an allowed creation method, the maximum percentage is not a guaranteed building footprint. Denton’s density/dimensional regulations, accessory-building standards, easements, lot coverage, utilities and environmental overlays can shrink the practical envelope.
Get the zoning district and a survey before selecting a prefab model. “Maryland compliant” does not mean “fits this Denton lot.”
7. Historic District properties need an earlier design check
Denton’s official FAQ says properties in the Historic District require Historic & Architectural Review Commission approval when owners make exterior changes, with examples including siding, windows, decks and additions. The Town publishes a Historic District map and an architectural/historic review application.
If your ADU involves a visible addition or detached building on a covered property, check historic review before finalizing architecture—not after the plans are complete.
8. Critical Area status can change the site plan
Denton publishes a Critical Area map and separate Critical Area permit information, buffer-management and lot-coverage materials. For affected parcels, environmental rules can matter independently of ordinary zoning setbacks.
Ask Planning & Codes whether your parcel is in the Critical Area and whether buffer, lot-coverage, stormwater or other requirements affect the proposed ADU location.
9. Water and sewer costs deserve an early conversation
Denton publishes residential water/sewer connection fees—currently listing $5,000 for single-family water, $6,000 for sewer and a $600 meter fee on its fee page. Those figures do not establish that every ADU will owe a separate full connection charge. They show why you should ask whether the ADU may share existing service, needs a separate meter, or triggers capacity/connection charges before finalizing the budget.
10. Denton homeowner checklist before paying a designer
- Confirm the parcel is inside Denton.
- Get the current zoning district.
- Ask which version of §128-89 is legally effective.
- Ask how Denton has implemented HB 1466’s 75% standard.
- Choose internal, addition, detached or garage-conversion concept.
- For detached units, verify setbacks, lot coverage, height and easements.
- Confirm the currently effective parking requirement.
- Check the Historic District map before exterior design.
- Check Critical Area status and environmental permit needs.
- Ask whether water/sewer can share existing service and what fees apply.
- Map building, mechanical, electrical and plumbing approvals.
- Only then commission final plans or order a prefab unit.
Denton MD ADU FAQs
Are Denton ADU rules the same as Caroline County?
No. Denton maintains its own Chapter 128 zoning ordinance and permit department. County rules should not automatically be applied to an in-Town parcel.
How big can a Denton ADU be?
Denton’s published 2025 draft used 60% of the principal dwelling or 1,000 sq ft, whichever is smaller. Maryland’s newer HB 1466 framework creates a 2026 alignment issue. Confirm the Town’s currently enacted maximum before designing.
Can I turn my basement or attic into an ADU?
The published Denton draft expressly lists conversion of existing living area, attic or basement as an ADU creation method. Building and life-safety requirements still apply.
Can I convert my garage?
The draft expressly contemplates repurposing an accessory building such as a garage. Confirm legal setbacks, residential building-code upgrades and utilities before purchasing plans.
Can I build a detached backyard ADU?
A stand-alone unit is one of the creation methods in Denton’s published draft. The lot must still satisfy applicable dimensional, accessory-structure, environmental and building requirements.
Do I need an extra parking space?
The published draft says no additional ADU space where on-street parking is permitted and adequate, and otherwise contemplates one additional space. Verify the effective 2026 rule before modifying the site.
What if my house is in Denton’s Historic District?
Denton says exterior changes to Historic District properties require Historic & Architectural Review Commission approval. Check this before finalizing an exterior addition or detached unit.
What if my property is in the Critical Area?
Denton has separate Critical Area maps and permit materials. Buffer, lot-coverage, stormwater or other environmental requirements can affect ADU siting.
Will I pay another full water and sewer connection fee?
Do not assume either way. Denton publishes residential connection fees, but the charge applicable to an ADU depends on how the Town treats the additional unit and utility connection. Ask before budgeting.
Should I buy a prefab ADU first?
No. Confirm the effective size rule, zoning, buildable envelope, parking, Historic/Critical Area status and utilities first. A prefab model can comply with a statewide concept yet fail on a specific Denton parcel.
Primary sources checked
- Town of Denton — Zoning Ordinance Comprehensive Review
- Town of Denton — Planning Commission Draft Zoning Ordinance
- Town of Denton — Zoning Update Presentation
- Town of Denton — Planning & Codes FAQ
- Town of Denton — Applications & Permits
- Town of Denton — Zoning & Permit Fees
Maryland ADU Guide is an independent research publication, not the Town of Denton, Caroline County, a law firm, architect or contractor. Draft ordinance language can change. Confirm the currently enacted requirements with Denton Planning & Codes before spending money on design or construction.
What to do next
Start by finding the office that reviews your property. A mailing city or a county guide does not establish your parcel’s authority.
- Find Who Reviews My Property.
- Obtain your parcel identifier, survey, floor plans and utility records.
- Ask the reviewing office which current rules, supporting documents and approvals apply.
- Continue to your planning workspace.
Enable JavaScript to prepare a downloadable next-step brief. Planning guidance is not permit approval.