ADUs are allowed in DuncanvilleTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Duncanville, TX
Is your property eligible for an ADU?
# of Properties
11,984
Owner-occupied
78%
Zoning districts
21
Avg Home Value
$330,031
Median Lot Size
0.23 acres
Avg Income
$82,526
Residential Types:
12,048 housing units
Single Family
97%
2-3 Family
2%
Apts (4+ units)
2%
Zoning Districts:
14,309 parcels · 21 districts
SF-10
32%(4,588)
SF-7
30%(4,239)
PD
15%(2,138)
SF-13
7%(998)
Other
16%(2,346)
ADU Rules
What can you build in Duncanville, TX?
Duncanville, TX 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
Max Units
- –1 ADU per single-family lot; duplex/multifamily: none specified; JADUs: none specified.
Owner Occupancy
- –Homeowner must live on the property.
Parking
- –1 space per ADU; 25% reduction in opportunity areas (excluding the Downtown Duncanville District); on-site parking unless a recorded shared-parking agreement; if multiple uses exist on a lot, parking is the sum for each use; ADU parking is in addition to the primary dwelling's requirement.
Rental Restrictions
- –Short-term rentals allowed only where STR is permitted (DD/GMS/UL) and with a city STR permit; not permitted in standard single-family districts.
- –Occupancy limited to one household; no multi-household rentals.
ADU State Law
What can you build in Texas?
- –Texas does not have a statewide ADU law. ADUs are regulated entirely at the local level.
- –ADU rules vary significantly by city, and many jurisdictions prohibit ADUs outright.
- –Counties generally lack zoning authority, but other restrictions may still apply outside city limits.
- –Outside city limits, ADU feasibility often depends on subdivision rules, deed restrictions, and septic or fire requirements.
- –Building/fire codes are set statewide, but whether an ADU is allowed is local zoning.
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 Texas municipalities
Rules change at the town line. Check the municipality your property is actually in.
Dallas County