ADUs are allowed in LancasterTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Lancaster, TX
Is your property eligible for an ADU?
# of Properties
13,266
Owner-occupied
69%
Zoning districts
33
Avg Home Value
$285,967
Median Lot Size
0.19 acres
Avg Income
$76,106
Residential Types:
13,361 housing units
Single Family
94%
2-3 Family
2%
Apts (4+ units)
4%
Zoning Districts:
15,575 parcels · 33 districts
SF-6
42%(6,470)
PD/SF-2
10%(1,554)
PD/SF
7%(1,128)
SF-5
6%(925)
Other
35%(5,498)
ADU Rules
What can you build in Lancaster, TX?
Lancaster, 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
Interior / Attached ADU Size Limits
- –Maximum size is the lesser of 900 sq ft or 50% of the main dwelling's floor area; in the AO district the cap is 1,200 sq ft.
Detached ADU Size Limits
- –Maximum size of 900 sq ft or 50% of the main structure, whichever is less; 1,200 sq ft in the AO district.
Max Units
- –1 per lot
Owner Occupancy
- –Owner occupancy not required.
Parking
- –1.5 spaces/ADU; max not specified; on-site parking required for lots under 5 acres; front-yard parking only on approved surfaces and not blocking sidewalks; no ADU-specific waivers or transit-based reductions; on non-SF/duplex lots total parking cannot exceed min+10% without an Exception; ADUs, Guest Quarters/Secondary Living Unit, one per lot.
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