ADUs are allowed in ForneyTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Forney, TX
Is your property eligible for an ADU?
# of Parcels
6,055
Zoning districts
17
Avg Parcel Value
$420,694
Median Parcel Size
0.20 acres
Zoning Districts:
6,196 parcels · 17 districts
PD
54%(3,333)
SF6
31%(1,942)
SF15
5%(321)
GR
4%(225)
Other
6%(375)
ADU Rules
What can you build in Forney, TX?
Forney, 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
Max Units
- –Single-family & multifamily: 1 ADU per lot.
Owner Occupancy
- –ADU must be occupied by owner's family/caretaker; not leased.
Parking
- –No numeric ADU parking ratio; general off-street parking on the same paved lot; ADUs allowed only as incidental uses behind the main dwelling (AG, SF-20, SF-15) and not sublet.
Rental Restrictions
- –ADU rentals prohibited; no leasing or subletting; occupancy limited to caretaker/guest/family member; short-term rentals prohibited.
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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Is your property eligible for an ADU?
ADU rules in other Texas municipalities
Rules change at the town line. Check the municipality your property is actually in.
Kaufman County