ADUs are allowed in Flower MoundTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Flower Mound, TX
Is your property eligible for an ADU?
# of Properties
405
Owner-occupied
65%
Zoning districts
46
Avg Home Value
$705,061
Median Lot Size
2.85 acres
Avg Income
$131,735
Residential Types:
405 housing units
Single Family
22%
Apts (4+ units)
64%
Other
15%
Zoning Districts:
28,090 parcels · 46 districts
SF10
24%(6,670)
SFD
23%(6,510)
SFDM
21%(6,036)
SFE
6%(1,694)
Other
26%(7,180)
ADU Rules
What can you build in Flower Mound, TX?
Flower Mound, TX follows state and local rules for Accessory Dwelling Units. Here is a concise overview of the local rules.
Eligibility
- –Internal / Attached ADU: Special Permit
- –Detached ADU: Special Permit
Detached ADU Size Limits
- –Maximum size is 50% of the primary dwelling’s habitable floor area
- –Absolute maximum size of 2,000 sq ft
Max Units
- –1 accessory dwelling per lot (separate structure)
Owner Occupancy
- –Owner occupancy not required; ADUs cannot be rented.
Rental Restrictions
- –Detached ADU rentals prohibited (including short-term 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.
Denton County