ADUs are allowed in TomballTypes:DetachedInternal
Types:DetachedInternal
Accessory Dwelling Unit (ADU) Rules for Tomball, TX
Is your property eligible for an ADU?
# of Properties
4,779
Owner-occupied
61%
Zoning districts
13
Avg Home Value
$318,611
Median Lot Size
0.17 acres
Avg Income
$106,510
Residential Types:
4,779 housing units
Res Improved Table Value
100%
Zoning Districts:
6,196 parcels · 13 districts
SF-6
28%(1,731)
NZ
21%(1,288)
SF-9
19%(1,153)
SF-20-E
10%(597)
Other
23%(1,427)
ADU Rules
What can you build in Tomball, TX?
Tomball, 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
- –1 ADU per lot in all residential districts (SF, duplex, multifamily)
- –Includes garage/accessory and detached
Owner Occupancy
- –ADU may be occupied only by owner's caretaker or guest.
Parking
- –0 spaces/ADU; ADU parking None; principal dwelling requires 2 off-street spaces (first 2 garage/carport spaces do not count toward that minimum).
Rental Restrictions
- –Rentals prohibited; ADUs may not be leased or sold. Occupancy limited to a caretaker or owner's guest/family (no short- or long-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.
Check my propertyHow can we help you?
Get matched with trusted local builders
Understand what's allowed on your property
Learn the key rules and size limits for ADUs
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.
Harris County