ADUs are allowed in CentrevilleTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Centreville, MD
Is your property eligible for an ADU?
# of Properties
1,726
Owner-occupied
84%
Zoning districts
13
Avg Home Value
$330,548
Median Lot Size
0.23 acres
Avg Income
$109,242
Residential Types:
1,726 housing units
Other
100%
Zoning Districts:
2,020 parcels · 13 districts
R-1
51%(1,022)
R-2
36%(732)
CBD
6%(117)
PBD
2%(37)
Other
6%(112)
ADU Rules
What can you build in Centreville, MD?
Centreville, 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: Conditional Use Permit
Detached ADU Size Limits
- –Maximum size of 900 sq ft when located in the Critical Area RCA and within 100 ft of the primary dwelling.
Max Units
- –R-1/R-3 (single-family): 1 internal ADU/lot. R-2 (single-family): 1 internal by right; up to 4 internal apartments total/lot (S.E.); 1 detached ADU/lot (S.E.).
- –TND (single-family): 1/lot; ADUs ≤15% of single-family detached units. RCA: 1/primary dwelling. Duplex/multifamily: none specified.
Owner Occupancy
- –Owner must reside permanently in the dwelling/main dwelling unit.
Parking
- –Min 1 space/ADU (PUDs: 2 per unit; TNDs: 1 per ADU). Max: none municipality-wide; TNDs cap total parking at 10% above minimum. Exceptions: P&Z may approve ±50% deviations; adjacent on-street parking may count in TNDs; R-1/R-2 require 1 space for the ADU and 2 for the main dwelling.
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.
Queen Anne's County