Houston allows ADUs in most residential zones but requires strict compliance with setbacks and lot coverage limits. The city has fewer restrictions than many metros, but permitting can be complex due to Houston's sprawling geography and multiple utility providers.
Zoning & Size Requirements [1][2]
Yes, you can build an ADU in Houston. A detached ADU can be up to 1,000 sq ft under current Texas and Houston zoning rules.
| Allowed Zones | Houston has no zoning code — ADUs are governed by deed restrictions, platting/subdivision rules, and development & parking standards rather than single-family/multifamily zoning districts |
| Max Size (Detached) | 900 sq ft (typical city standard; verify against deed restrictions and any 1,000 sq ft / 50%-of-primary limits) |
| Max Size (Attached) | 900 sq ft |
| Max Size (JADU) | Not commonly allowed |
| Max Height | Confirm with City of Houston Planning — governed by deed restrictions and building code rather than a citywide zoning height (no zoning in Houston) |
| Max Units | 1 ADU per lot |
Setback Requirements [1][2]
Houston requires a rear setback of about 5 ft for a detached ADU, and one off-street parking space is required. Owner-occupancy is not required — you can rent it out without living on the property.
| Rear Setback | 5 feet |
| Side Setback | 5 feet |
| Front Setback | Confirm with City of Houston (front setback varies; commonly ~15-25 ft depending on block/deed restrictions) |
| Parking Required | 1 off-street parking space required for ADU (separate from primary dwelling's 2 spaces) |
| Owner Occupancy | Not required by the city (no citywide owner-occupancy mandate); individual deed restrictions may require it |
| Min Lot Size | Confirm with City of Houston — no citywide zoning; lot/coverage limits (structures ≤ ~45% of lot) and deed restrictions govern |
Permit Process & Fees
An ADU permit in Houston typically costs $3,000-$5,500 and takes 60-90 days, through a standard permit review.
| Approval Process | Building permit + plumbing/electrical permits |
| Review Timeline | 60-90 days |
| Permit Fees | $3,000-$5,500 |
| Impact Fees | $800-$1,500 |
| Plan Check | 3-4 weeks |
| Pre-Approved Plans | Limited pre-approval program |
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Construction Costs [3][4]
Building an ADU in Houston typically costs $120,000-$240,000 ($100-$200 per sq ft); a garage conversion runs $50,000-$130,000.
| Average Build Cost | $120,000-$240,000 |
| Cost per Sq Ft | $100-$200 |
| Garage Conversion | $50,000-$130,000 |
| Prefab ADU (Installed) | $80,000-$190,000 |
Finance Your ADU Project
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Rental Income Potential [5][6]
A 2-bedroom ADU in Houston rents for around $1,400-$2,100/mo, an estimated 6-9% annual return.
| Avg Rent (1 Bedroom) | $1,100-$1,600/mo |
| Avg Rent (2 Bedroom) | $1,400-$2,100/mo |
| Short-Term Rental | Varies by neighborhood |
| Est. Annual ROI | 6-9% annual return |
Explore Prefab ADU Options
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Recent Law Changes
What's Changed Recently
- Data accuracy correction (2026-06-28): updated per official city/state sources following a regulatory audit.
- Texas SB 673 (statewide ADU preemption) died when the 89th Legislature adjourned without final passage — June 2025. No statewide ADU law
- Houston has no traditional zoning; recorded deed restrictions (covering a large share of the city) remain the primary barrier to ADUs
- ADU standard size is approximately 900 sq ft, with rear/side setbacks of 5 ft and one off-street parking space required for the ADU
- Short-term rentals require a City of Houston registration — confirm current STR ordinance status with the City
Tips for Building an ADU in Houston
- Houston's sprawl means utility connections can be complex; budget extra time
- Lot size matters more in Houston than many cities due to setback requirements
- The HOA approval process can add 4-6 weeks; check deed restrictions early
- Consider ground-level ADUs due to hurricane and flooding concerns
ADU Builders in Houston
Looking for an ADU builder in Houston? ADU projects need a contractor experienced with local zoning, the permit process, and utility connections — not every general contractor has built one. We match Houston homeowners with experienced local ADU contractors who provide free, no-obligation quotes. Getting at least three bids typically saves 20-40% on the same scope.
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- ADU | HOU Design Book — City of Houston Planning Department — Accessed 2026-06-28
- Development Regulations — City of Houston Planning & Development Planning Department — Accessed 2026-06-28
- Angi — ADU Construction Cost Data Market Data — Accessed 2026-02-24
- Angi — Local ADU Contractor Costs Market Data — Accessed 2026-02-24
- Zillow Rental Manager — Market Rent Data Market Data — Accessed 2026-02-24
- HUD Fair Market Rents Government Data — Accessed 2026-02-24
- ADU | HOU Design Book — City of Houston Planning Department — Accessed 2026-02-24
- Texas Local Government Code — Land Use Regulations Government Data — Accessed 2026-02-24
Frequently Asked Questions
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