ADUs are allowed in Rock HallTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Rock Hall, MD
Is your property eligible for an ADU?
# of Properties
958
Owner-occupied
42%
Zoning districts
12
Avg Home Value
$275,680
Median Lot Size
0.31 acres
Avg Income
$85,623
Residential Types:
958 housing units
Other
100%
Zoning Districts:
1,133 parcels · 12 districts
R1
63%(716)
R3
12%(135)
MREC
6%(68)
C3
4%(47)
Other
15%(167)
ADU Rules
What can you build in Rock Hall, MD?
Rock Hall, MD follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: By Right
- –Detached ADU: By Right
Interior / Attached ADU Size Limits
- –Maximum of 850 sq ft or 50% of the primary dwelling’s building footprint, whichever is less.
Detached ADU Size Limits
- –Maximum ADU floor area of 850 sq ft or 50% of the principal building footprint, whichever is less
Max Units
- –Single-family detached: 1 ADU/lot (incl. MREC)
- –Duplex/triplex/townhouse/multifamily: 0
Owner Occupancy
- –Owner must occupy the principal dwelling.
Parking
- –1 space/ADU; Planning Commission may approve up to 20% reduction; off-site within 500 ft or joint use; C-3 District may waive off-street parking if nearby public parking is available
Rental Restrictions
- –90-day minimum initial lease; after term, month-to-month tenancy. Short-term rentals prohibited. 90-day minimum not required for immediate family tenants of the owner; deed restrictions must be recorded reflecting these requirements.
ADU State Law
What can you build in Maryland?
- –Local-law mandate: By Oct 1, 2026, each legislative body must adopt a local law authorizing ADUs under this section.
- –Local zoning mostly remains: The subtitle generally does not alter local zoning power except as provided, but locals must establish policies that further the subtitle's intent.
- –Definition-based size cap: An ADU must be ≤ 75% of the size of the primary SF detached dwelling and subordinate in use; ADUs may be detached or attached.
- –Density/growth limits: ADUs must be excluded from density calculations and from measures limiting residential growth that pertain to the lot/parcel/tract.
- –Setbacks: Local law cannot set side/rear setbacks that exceed existing accessory-structure setbacks.
- –Parking: If a jurisdiction adds off-street parking requirements, it must consider specified factors and provide a waiver process, and must complete a parking study before adopting such requirements.
- –Alley access option: Local law may prohibit converting an accessory structure to an ADU if only vehicular access is from an alley.
- –Codes/adequate facilities: Local law must provide for ADU construction meeting public health/safety/welfare standards, including building codes and adequate public facilities provisions.
What's allowed on your lot?
These are the municipality-wide rules. What's allowed on a specific property also depends on state laws, setbacks, floor area ratio, lot coverage, environmental constraints, topography, and other property-specific factors. Search your address on FutureLot to see what's allowed on your property.
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ADU rules in other Maryland municipalities
Rules change at the town line. Check the municipality your property is actually in.
Kent County