Yes: Houston has no zoning, and Code of Ordinances § 42-1 (Livable Places amendments, Ord. 2023-801, effective Nov 27, 2023) treats a house plus a detached second dwelling unit of up to 1,500 sq ft as ordinary single-family use, so a second unit is allowed on any single-family lot that recorded deed restrictions do not prohibit. There is no owner-occupancy rule, no interior side or rear building line in Chapter 42, and no added parking for a unit of 1,000 sq ft or less when the main house already has its own spaces (§ 42-186(b), § 26-492). You need a building permit through the Houston Permitting Center, sited behind the platted front building line (20-25 ft on most streets, § 42-156). Deed restrictions and any special minimum lot size or building line for your block control where they are stricter (§ 42-150(b)). Short-term rental of the unit needs a city certificate of registration (Ch. 28 Art. XXIII, effective Jan 1, 2026).
Zoning & Size Requirements [1][2][3][4][5][6]
Yes — Houston allows ADUs. A detached ADU can typically be up to 1,500 sq ft under current Texas and Houston zoning rules.
See what this means for your lot — ask Houston ADU builders for a quote →
| Allowed Zones | Houston has no zoning. Under Code of Ordinances § 42-1, a lot with one house and a detached second dwelling unit of not more than 1,500 sq ft is 'single-family residential' (Livable Places amendments, Ord. 2023-801, eff. Nov 27, 2023), so a second unit is allowed on any single-family lot citywide unless recorded deed restrictions, the plat, or a special minimum lot size/building line designation for the block prohibit it. Where deed restrictions are stricter they control (§ 42-150(b)). |
| Max Size (Detached) | 1,500 sq ft. § 42-1 defines single-family residential to include 'a detached second dwelling unit of not more than 1500 square feet'; the cap was increased by the Livable Places amendments (Ord. 2023-801, eff. Nov 27, 2023). The code does not say how the area is measured; deed restrictions may set a lower cap or bar a second unit entirely. |
| Max Size (Attached) | No Chapter 42 cap. § 42-1 counts one building containing up to two units on a lot as single-family residential, so an attached second unit (over an attached garage, or a duplex layout) is limited only by the Building Code, the platted building lines and deed restrictions. Its parking follows unit size (§ 42-186(b)); above 1,500 sq ft the unit needs its own 2 spaces (§ 42-186(a)). |
| Max Size (JADU) | No JADU category in Houston's code. A unit carved out inside the house is simply the second of the 'not more than two' units one building may hold (§ 42-1); no minimum or maximum size is set for it, and no owner-occupancy or covenant applies. |
| Max Height | No citywide height limit for single-family lots in Chapter 42 (the 30 ft cap in § 42-194 applies only to courtyard-style developments). Height is limited by deed restrictions, any platted restriction, and the Building Code; confirm with the Houston Permitting Center. |
| Max Units | One detached second dwelling unit (up to 1,500 sq ft) per single-family lot, or up to two units within one building (§ 42-1). Three or more units on a tract is multi-unit residential (§ 42-237) with its own standards. |
Setback Requirements [1][2][3][4][5][6]
Houston sets no ADU-specific rear setback — the setbacks row explains what governs instead — and parking requirements vary by unit size or location. Owner-occupancy is not required — you can rent it out without living on the property.
| Rear Setback | Chapter 42 sets no interior rear building line for a single-family lot; it sets 10 ft along a rear lot line that abuts a collector or local street (§ 42-156) and 3 ft along a shared driveway 18 ft or wider (§ 42-159). Interior rear lines are governed by deed restrictions, the plat and the Building Code's fire-separation rules — confirm with the Houston Permitting Center. |
| Side Setback | Chapter 42 sets no interior side building line for a single-family lot; 10 ft applies only along a side lot line that abuts a collector or local street (§ 42-156). Interior side lines come from deed restrictions, the plat and the Building Code's fire-separation distance to the property line — confirm with the Houston Permitting Center. |
| Front Setback | Platted front building line: 25 ft on a collector street and 20 ft on a local street (10 ft with a typical-lot-layout plat note), and 20 ft for a street-facing garage (§ 42-156); 10 ft under the § 42-157(b) performance standard, 5 ft or 0 ft where §§ 42-157(c)-(d) are met. A larger deed-restriction or special minimum building line controls (§ 42-150(b)-(c)); a second unit must sit behind the platted line. |
| Parking Required | § 42-186(b) and § 26-492: if the main house meets its own requirement (2 spaces, or 1 space if the house is 1,500 sq ft or less), a second unit of 1,000 gross sq ft or less needs no added space and a unit of 1,001-1,500 sq ft needs 1 added space. If the main house is short of spaces, the second unit needs 1 space. Lots under 33 ft of frontage get one 12-ft driveway per frontage and no extra driveway for the second unit (Livable Places User Guide, §§ 42-186, 42-188). |
| Owner Occupancy | Not required. Chapter 42 contains no owner-occupancy, rental or deed-covenant condition for a second dwelling unit; either unit may be rented long-term. Recorded deed restrictions may impose their own limits. |
| Min Lot Size | No ADU-specific minimum. A single-family lot with sewer service is 3,500 sq ft minimum inside the city (5,000 sq ft in the ETJ), reducible to 1,400 sq ft under the §§ 42-181 to 42-184 performance standards; a special minimum lot size area (§§ 42-197 to 42-208) controls where designated. The second unit must fit within the lot's building lines and parking. |
Permit Process & Fees [7][8][9]
An ADU permit in Houston goes through a standard permit review. Review time: not published. The city posts no residential plan-review target; ask the Houston Permitting Center (832-394-9000) for current cycle times. Permit fees: Set by the City Fee Schedule (CPI increase of 1.391% on Jan 1, 2026): minimum building permit $91.06, minimum plumbing permit $97.56, administrative fee $33.56; the full residential fee formula was not readable this pass, so price your project with HPC's Fee Calculator.
| Approval Process | Building permit through the Houston Permitting Center (Houston Public Works, 1002 Washington Ave): plans go in through iPermits/ProjectDox, the Planning Department's site-plan review checks building lines, lot size and parking, then electrical, plumbing and mechanical permits and inspections follow. No hearing or discretionary approval; a replat is needed only if the lot is being split. |
| Review Timeline | Not published. The city posts no residential plan-review target; ask the Houston Permitting Center (832-394-9000) for current cycle times. |
| Permit Fees | Set by the City Fee Schedule (CPI increase of 1.391% on Jan 1, 2026): minimum building permit $91.06, minimum plumbing permit $97.56, administrative fee $33.56; the full residential fee formula was not readable this pass, so price your project with HPC's Fee Calculator. |
| Impact Fees | No general residential impact fee. Water and wastewater impact fees (Ch. 47 Arts. IX-X) are charged per service unit on 'new development' that adds capacity demand, at rates set in the City Fee Schedule (water-fee indexing resumed July 1, 2026, § 47-384); whether a second unit on the existing meter is assessed depends on the connection — ask HPC Impact Fee Administration. |
| Plan Check | Not published; Houston Public Works reviews residential plans through ProjectDox and ILMS, with resubmittal cycles as needed. |
| Pre-Approved Plans | ADU|HOU program: one free permit-ready plan set (the 'Double-House' design-competition winner, with preliminary Houston Public Works approval), a design book of 26 schematic designs, and three workshop videos. The program's web home (letstalkhouston.org/adu) no longer serves city content as of Sept 2026 — request the files from Planning & Development (832-393-6624). |
Get Free ADU Quotes in Houston
Tell us about your project and we'll pass it to ADU builders serving Houston. Free, no obligation — you choose who to work with. We don't have builders in every area yet; if nobody covers yours, we'll email you to say so.
1. Tell us your project
Takes about a minute.
Takes about a minute.
2. We match local pros
Up to 5 independent local ADU builders — never more, and we tell them nothing you don't submit here.
Up to 5 independent local ADU builders — never more, and we tell them nothing you don't submit here.
3. You choose
Compare quotes, verify license & insurance, hire (or don't). No spam either way.
Compare quotes, verify license & insurance, hire (or don't). No spam either way.
🔒 Your info is secure. We share it only with contractors quoting your project. No spam, no obligation.
Just browsing? Search ADU builders near you by ZIP code.
Construction Costs [10][11][12]
Building an ADU in Houston typically costs $140,000-$260,000 ($225-$350 per sq ft); a garage conversion runs $60,000-$110,000.
See what this means for your lot — ask Houston ADU builders for a quote →
| Average Build Cost | $140,000-$260,000 |
| Cost per Sq Ft | $225-$350 |
| Garage Conversion | $60,000-$110,000 |
| Prefab ADU (Installed) | $150,000-$300,000 |
Finance Your ADU Project
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.
Some links on this page are affiliate links. We may earn a commission at no extra cost to you. Learn more
Rental Income Potential [13][14][15]
A 2-bedroom ADU in Houston rents for around $1,500-$2,250/mo, an estimated 6-12% gross rent yield (annual rent divided by build cost, before expenses).
| Avg Rent (1 Bedroom) | $1,250-$1,900/mo |
| Avg Rent (2 Bedroom) | $1,500-$2,250/mo |
| Short-Term Rental | Yes, with a city certificate of registration per unit rented under 30 days (Ch. 28 Art. XXIII, Ord. 2025-322, eff. Jan 1, 2026): fee per City Fee Schedule, hotel tax, one-night minimum. Deed restrictions may bar STRs. |
| Est. Annual ROI | 6-12% gross rent yield (annual rent divided by build cost, before expenses) |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half.
Some links on this page are affiliate links. We may earn a commission at no extra cost to you. Learn more
Recent Law Changes
What's Changed Recently
- Re-verified 2026-09-20 against Chapter 42, Chapter 26 and Chapter 28 of the Code of Ordinances as codified through Ord. 2026-0709 (Aug 12, 2026): no ADU-related amendment since the Livable Places ordinances (Ord. 2023-801 and 2023-802, adopted Sept 27, 2023, effective Nov 27, 2023).
- Short-term rentals: Ord. 2025-322 (adopted April 16, 2025, effective Jan 1, 2026) added Ch. 28 Art. XXIII — every unit rented for under 30 days needs a certificate of registration; applications opened Aug 1, 2025; certificates issued through Dec 31, 2026 expire Dec 31, 2027; platform delisting of unregistered units begins Jan 1, 2027.
- Fees: most Houston Permitting Center permit and registration fees rose 1.391% (CPI) on Jan 1, 2026 — minimum building permit $91.06, minimum plumbing permit $97.56, administrative fee $33.56.
- Texas: SB 673 (statewide ADU preemption) died on the House calendar in May 2025; the 2025 session laws SB 15, SB 840 and HB 24 contain no ADU text and, because Houston has no zoning, do not change its second-dwelling-unit rules. The 90th Legislature convenes Jan 12, 2027.
- The city's ADU|HOU resource site (letstalkhouston.org/adu, linked from houstontx.gov/adu) no longer serves city content as of Sept 2026; the Livable Places User Guide (Jan 2024) remains on houstontx.gov/planning.
Tips for Building an ADU in Houston
- Pull your deed restrictions before you design: the city cannot override them (§ 42-150(b)), and a restriction to 'one residence' or 'single-family' can bar a second unit that Chapter 42 would otherwise allow. The Planning Department's Deed Restriction Compliance Affidavit is part of the site-plan review.
- Keep the unit at 1,000 sq ft or less if you want to add no parking; 1,001-1,500 sq ft costs one more off-street space (§ 42-186(b)). Where an alley exists, take the unit's access from it — narrow lots (under 33 ft) get only one 12-ft driveway.
- Chapter 42 has no interior side or rear setback, so the practical limits are the Building Code's fire-separation distance to the property line and your platted building lines — check both at the Houston Permitting Center before siting a garage apartment on a lot line.
- Cost basis: Harbert Group Houston ADU guide (2026) — 600 sq ft detached $140,000-$220,000 all-in, $225-$325 per sq ft, garage conversion $60,000-$110,000, permits $2,000-$4,000; Maxable Houston guide (undated) — city officials' one-bedroom average about $150,000, garage conversions from $100,000; UHS Remodeling DFW casita guide (June 2026) $250-$400 per sq ft as the Texas upper bound; Dwelling Index (May 2026) installed modular $200,000-$400,000+. Rents: HUD FY2027 SAFMR for inner-loop ZIPs 77006-77098 (1BR $1,130-$1,900, 2BR $1,340-$2,250) and the metro FMR (1BR $1,261, 2BR $1,497).
- Most of Houston sits in a mapped floodplain or a drainage-sensitive area: a second unit in a special flood hazard area must meet Chapter 19 (floodplain) elevation rules, and a slab-on-grade unit may need to be raised — get the flood zone from the Houston Permitting Center before pricing the foundation.
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.
- Houston Code of Ordinances § 42-1 Definitions ('single-family residential' incl. detached second dwelling unit ≤1,500 sq ft; history Ord. 2023-801, eff. 11-27-2023), Supp. 93 Update 1, codified through Ord. 2026-0709 Municipal Code — Accessed 2026-09-20
- Houston Code of Ordinances §§ 42-180 to 42-186 (general lot design, single-family lot size 3,500/5,000/1,400 sq ft, parking for single-family uses incl. second dwelling unit rule § 42-186(b)) Municipal Code — Accessed 2026-09-20
- Houston Code of Ordinances §§ 42-150, 42-151, 42-156, 42-157, 42-159 (building line requirements; deed restrictions control if greater, § 42-150(b)) Municipal Code — Accessed 2026-09-20
- Houston Code of Ordinances § 26-492 Parking spaces for certain types of use classifications (single-family and second dwelling unit rows; Ord. 2023-802) Municipal Code — Accessed 2026-09-20
- Livable Places (Chapters 42/26 amendments effective Nov 27, 2023) — City of Houston Planning & Development, with the Livable Places User Guide (Jan 2024, § 2.1 Second Dwelling Unit) and FAQ (Sept 14, 2023) Planning Department — Accessed 2026-09-20
- Development Regulations — City of Houston Planning & Development (no zoning; Chapter 42 platting, site plan review, deed restriction affidavit) Planning Department — Accessed 2026-09-20
- Houston Permitting Center — 2026 Fee Increase Notice (1.391% CPI, effective Jan 1, 2026; admin fee $33.56, minimum building permit $91.06, minimum plumbing permit $97.56) Planning Department — Accessed 2026-09-20
- Houston Code of Ordinances Ch. 47 Art. IX §§ 47-316, 47-319 and Art. X §§ 47-384, 47-393 (water and wastewater impact fees per service unit; rates in the City Fee Schedule) Municipal Code — Accessed 2026-09-20
- Livable Places User Guide § 3.3 Resources — ADU|HOU Program (Double-House free plans, 26-design book, three workshop videos), City of Houston Planning & Development, Jan 2024 Planning Department — Accessed 2026-09-20
- Building an ADU in Houston 2026: Costs, Rules, and Real ROI — Harbert Group (Houston) industry — Accessed 2026-09-20
- Everything you need to know about ADUs in Houston — Maxable (undated; cites city officials' $150,000 one-bedroom average) industry — Accessed 2026-09-20
- DFW ADU & Casita Cost Guide 2026 (June 29, 2026), UHS Remodeling industry — Accessed 2026-09-20
- HUD FY2027 Small Area Fair Market Rents, Houston-The Woodlands-Sugar Land HMFA (ZIPs 77006-77098: 1BR $1,130-$1,900, 2BR $1,340-$2,250) Government Data — Accessed 2026-09-20
- HUD FY2027 Fair Market Rent Schedule, Houston-The Woodlands-Sugar Land HMFA (1BR $1,261, 2BR $1,497) Government Data — Accessed 2026-09-20
- Houston Code of Ordinances Ch. 28 Art. XXIII Short-Term Rentals (§§ 28-721, 28-722, 28-731, 28-741; Ord. 2025-322, eff. 1-1-2026) and ARA Short-Term Rental page Municipal Code — Accessed 2026-09-20
- Texas SB 673 (89R) bill history: last action 05/26/2025 H Placed on General State Calendar Government Data — Accessed 2026-09-20
- Texas Local Government Code Ch. 211 (municipal zoning authority; Houston has adopted no zoning ordinance) Government Data — Accessed 2026-09-20
Frequently Asked Questions
Can I build an ADU in Houston?
Yes. ADUs are allowed in Houston has no zoning. Under Code of Ordinances § 42-1, a lot with one house and a detached second dwelling unit of not more than 1,500 sq ft is 'single-family residential' (Livable Places amendments, Ord. 2023-801, eff. Nov 27, 2023), so a second unit is allowed on any single-family lot citywide unless recorded deed restrictions, the plat, or a special minimum lot size/building line designation for the block prohibit it. Where deed restrictions are stricter they control (§ 42-150(b)). in Houston. The maximum size for a detached ADU is 1,500 sq ft. § 42-1 defines single-family residential to include 'a detached second dwelling unit of not more than 1500 square feet'; the cap was increased by the Livable Places amendments (Ord. 2023-801, eff. Nov 27, 2023). The code does not say how the area is measured; deed restrictions may set a lower cap or bar a second unit entirely.. Owner-occupancy is not required, so you can rent out the ADU.
How much does an ADU cost in Houston?
ADU construction in Houston typically costs $140,000-$260,000. Garage conversions run $60,000-$110,000, and prefab ADUs cost $150,000-$300,000.
How much can I rent an ADU for in Houston?
Average ADU rents in Houston are $1,250-$1,900/mo for a 1-bedroom and $1,500-$2,250/mo for a 2-bedroom unit.
Do I need parking for an ADU in Houston?
§ 42-186(b) and § 26-492: if the main house meets its own requirement (2 spaces, or 1 space if the house is 1,500 sq ft or less), a second unit of 1,000 gross sq ft or less needs no added space and a unit of 1,001-1,500 sq ft needs 1 added space. If the main house is short of spaces, the second unit needs 1 space. Lots under 33 ft of frontage get one 12-ft driveway per frontage and no extra driveway for the second unit (Livable Places User Guide, §§ 42-186, 42-188).. Check with Houston planning department for the latest Texas ADU parking rules, as many states have relaxed requirements in recent years.
How long does it take to get an ADU permit in Houston?
Houston does not publish a standard ADU review timeline. The city posts no residential plan-review target; ask the Houston Permitting Center (832-394-9000) for current cycle times. Permit fees: Set by the City Fee Schedule (CPI increase of 1.391% on Jan 1, 2026): minimum building permit $91.06, minimum plumbing permit $97.56, administrative fee $33.56; the full residential fee formula was not readable this pass, so price your project with HPC's Fee Calculator.
Ready to Build in Houston?
Get free, no-obligation quotes from top-rated ADU contractors in Houston.
Get Free Quotes →Build ADUs in Houston?
Homeowners read this page while planning, then ask us to connect them with a local builder. We pass those requests to builders who cover Houston — a flat fee only on the leads you accept, no subscription, and you contract directly with the homeowner.
See who's waiting in Texas →