Worcester County ADU Rules 2026: 35% Size Cap, Parking, No Owner-Occupancy Rule & HB 1466 Conflict

Worcester County already allows accessory apartments, but its current published rules do not yet line up cleanly with Maryland’s 2026 ADU standards. The County allows one accessory apartment in or alongside an existing single-family dwelling, but the local code still uses a 35% / 900-square-foot cap and requires an additional parking space. Maryland’s HB 1466 framework says qualifying ADUs may not be capped below 75% of the primary dwelling and imposes conditions on extra parking requirements. Until Worcester adopts or publishes a replacement framework, homeowners should treat the County as a transition / source-conflict jurisdiction.

The safest way to plan in Worcester County is to separate the currently published zoning code from Maryland’s newer statewide ADU requirements. The County’s 2025 Housing Study says ADUs are already allowed by right in zones where single-family dwellings are permitted and recommends expanding ADU access, but I could not verify a 2026 County ordinance that replaces the older accessory-apartment standards yet. Properties inside Berlin, Ocean City, Pocomoke City or Snow Hill should also be checked separately because those municipalities have their own boundaries and local land-use authority.

Last verified: September 13, 2026. No enacted 2026 Worcester County ADU replacement ordinance was verified in the official records reviewed. This page is informational and is not legal, zoning, architectural, engineering or permitting advice.

Worcester County ADU status at a glance

What Worcester County’s current accessory-apartment rule says

Section ZS 1-338 allows an accessory apartment either inside the principal dwelling or inside an accessory building. Manufactured or mobile homes do not qualify as accessory apartments under this provision. The County allows no more than one accessory apartment per existing single-family dwelling.

The rule also says the accessory apartment does not count against permitted density for the parcel under this zoning section, although other regulations can still affect density calculations.

The 35% / 900-sq-ft size conflict

Worcester County’s published code sets a minimum accessory-apartment size of 500 square feet. The maximum is the lesser of 35% of the principal dwelling’s gross floor area or 900 square feet. The same maximum applies whether the apartment is inside the principal dwelling or in an accessory building.

Maryland Department of Planning’s HB 1466 guidance says local jurisdictions may not limit qualifying ADUs below 75% of the size of the primary dwelling. That creates a material source conflict. Until Worcester County publishes an updated local rule or implementation guidance, do not assume the older 35% / 900-sq-ft cap is the final ceiling that will govern a 2026 permit application.

Does Worcester County require owner occupancy?

No owner-occupancy requirement appears in the current § ZS 1-338 accessory-apartment standards. The code’s editor note says the former condition requiring the owner to occupy one of the dwelling units was repealed on November 17, 2020 by Bill 20-8.

This is an important difference from several other Maryland counties that still publish owner-occupancy conditions. Rental licensing, short-term-rental rules and private covenants can still create separate restrictions, so owner occupancy should not be confused with permission for every form of rental use.

How much parking is required?

Worcester County’s current parking schedule requires one off-street motor-vehicle space per accessory apartment, in addition to the parking required for the principal use. The code lists a maximum of two spaces for the accessory apartment.

Maryland’s HB 1466 guidance says a jurisdiction that requires additional ADU parking must have completed the required parking study and provide a waiver process. I did not verify a Worcester-specific HB 1466 parking waiver in the current accessory-apartment text reviewed, so homeowners should confirm the County’s 2026 implementation before designing around the extra-space requirement.

Detached ADUs: the 100-foot rule and accessory-building setbacks

If the accessory apartment is in an accessory building, Worcester’s code generally requires the entire perimeter of that building to be within 100 feet of the principal building. A greater separation can be approved through the County’s administrative-adjustment process where the property is outside the Chesapeake or Atlantic Coastal Bays Critical Area.

General accessory-building rules also matter. In residential and related districts, accessory buildings are generally required to remain at least six feet from other buildings, rights-of-way and adjoining lot lines unless another provision controls. Parcel-specific setbacks, floodplain rules, Critical Area restrictions and easements can still change the buildable area.

Wastewater and septic capacity are an early feasibility test

Section ZS 1-338 expressly conditions accessory apartments on adequate wastewater-disposal capacity as determined by Worcester County Environmental Programs. That makes wastewater review a threshold issue rather than a late-stage permit formality.

The County’s septic permit materials also make clear that sewage-disposal areas must remain free of structures, driveways and other encroachments and that bedroom count is used to calculate sewage flow. If the property is not served by public sewer, confirm septic capacity and reserve-area constraints before finalizing the ADU footprint.

Berlin, Ocean City, Pocomoke City and Snow Hill need separate checks

Worcester County contains four incorporated municipalities: Berlin, Ocean City, Pocomoke City and Snow Hill. County GIS also identifies municipal areas separately from County zoning. A Worcester County mailing address therefore does not by itself establish that County § ZS 1-338 controls the property.

Use the Maryland ADU Jurisdiction Finder before relying on the County numbers if the parcel is near or inside a municipal boundary.

What Worcester County homeowners should do now

1. Confirm the controlling jurisdiction. County rules may not control parcels inside Berlin, Ocean City, Pocomoke City or Snow Hill.
2. Confirm the zoning district. Accessory apartments are allowed in multiple districts, but the parcel still has to qualify for the underlying residential use.
3. Do not design to the old 35% / 900-sq-ft cap without confirmation. Ask the County how HB 1466 is being implemented for 2026 applications.
4. Check the one-space parking rule. Ask whether the County has adopted or is applying an HB 1466 parking-study/waiver process.
5. Check detached placement. The 100-foot rule and general accessory-building setbacks can materially affect siting.
6. Resolve wastewater first. On septic properties, capacity and reserve-area constraints can determine whether the project works at all.
7. Separate long-term and short-term rental rules. Worcester permits accessory apartments to be rented, but short-term rentals are separately regulated.
8. Re-check before spending. Get the controlling 2026 rule confirmed before paying for architectural plans, prefab deposits or site work.

Primary sources used for this Worcester County guide

• Worcester County Code § ZS 1-338 — Accessory apartments
• Worcester County Code § ZS 1-320 — Off-street parking
• Worcester County general accessory-structure standards
• 2025 Worcester County Housing Study
• Worcester County Environmental Programs — septic permit materials
• Maryland Department of Planning — HB 1466 ADU FAQ

For statewide comparison, use the Maryland County ADU Rules Tracker. Maryland ADU Guide is maintained by Gijo John as an independent research publication.