ADUs are allowed in ToolTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Tool, TX
Is your property eligible for an ADU?
# of Parcels
1,956
Zoning districts
7
Avg Parcel Value
$250,453
Zoning Districts:
1,932 parcels · 7 districts
R-1
75%(1,440)
RA
12%(231)
B-1
6%(125)
MH-2
5%(93)
Other
2%(43)
ADU Rules
What can you build in Tool, TX?
Tool, 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 600 sq ft or the principal building’s interior square footage, whichever is less.
Parking
- –No ADU-specific min/max; parking must be the same as for a similar use on the same lot; off-site/shared provisions limited to institutional/nonresidential uses.
Rental Restrictions
- –Guest house cannot be rented or used as a separate dwelling; Servant’s/Caretaker’s/Guard’s Residence cannot be rented as an independent unit
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.
Henderson County