ADUs are allowed in LewisvilleTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Lewisville, TX
Is your property eligible for an ADU?
# of Properties
324
Owner-occupied
77%
Zoning districts
50
Avg Home Value
$424,405
Median Lot Size
10.49 acres
Avg Income
$197,425
Residential Types:
324 housing units
Single Family
36%
Apts (4+ units)
32%
Other
32%
Zoning Districts:
25,073 parcels · 50 districts
R7.5
37%(9,218)
TH
14%(3,570)
R5
11%(2,863)
R6
6%(1,598)
Other
31%(7,824)
ADU Rules
What can you build in Lewisville, TX?
Lewisville, TX follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: Conditional Use Permit
- –Detached ADU: By Right
Detached ADU Size Limits
- –Maximum size is the greater of 800 sq ft or 50% of the principal building’s floor area
Max Units
- –1 backyard cottage per lot
- –Commercial ADU (non-residential): 1 per building
Owner Occupancy
- –Owner must occupy either the principal building or ADU as a residence.
Parking
- –1 space/ADU; max not specified; if parking is on a paved surface outside a residential garage, it must be non-tandem and contiguous with the principal driveway (Article VIII.1 governs other provisions).
Rental Restrictions
- –Short-term rentals (<30 days) prohibited; citywide interim ban applies to ADUs; expires 2025-02-19
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.
Denton County