Do I Need a Permit to Build an ADU in Houston, TX?

ADU-specific overview

What makes this different from a simple accessory structure

Pulled from the city's ADU guidance and linked code references.

Permit type: Residential new construction building permit through Houston Permitting Center (houstonpermittingcenter.org). Houston treats an ADU as a new residential dwelling unit subject to full IRC and Houston Building Code review, not as an accessory structure.
Maximum size: Houston has no citywide zoning ordinance, so there is no city-imposed maximum ADU floor area. Deed restrictions recorded with Harris County are the primary size constraint for most parcels. Verify deed restrictions before design.
Setbacks: Houston has no general citywide zoning setback ordinance for residential lots. The Houston Building Code and 2021 IRC structural fire separation and access requirements apply. Deed restrictions may impose additional setback requirements specific to your subdivision.
Owner occupancy: Houston's building permit process does not impose an owner-occupancy requirement for ADUs. No citywide zoning rule requires the property owner to occupy either the main dwelling or the ADU. Deed restrictions for specific subdivisions may differ.
Parking: Houston has no citywide parking-space requirement for ADUs in residential contexts under the building code framework. Deed restrictions may impose parking or driveway requirements for specific subdivisions.
Utilities: Each ADU requires a separate address and utility service connections. CenterPoint Energy (electric), Houston Public Works (water and sewer), and applicable tap fees and capacity standards apply. New utility taps may require coordination with Houston Public Works.
JADU distinction: Houston does not have a California-style Junior ADU (JADU) permit track. Any interior conversion that creates a full dwelling unit is treated as a residential alteration or new construction under the Houston Building Code.

Houston is the largest city in the United States without a traditional zoning ordinance. This means deed restrictions are the primary land-use constraint homeowners must verify before building an ADU.
Texas does not have statewide ADU preemption. Houston's no-zoning framework is unique — there are no local zoning setback or size rules to preempt beyond the building code.
Texas HB 2127 (88th Legislature, 2023) restricts some forms of local economic regulation but is not an ADU-specific preemption statute.
Deed restriction enforcement in Houston is a private-law matter between property owners, not a city enforcement function. Violating deed restrictions can result in injunctive relief sought by neighboring property owners.

Conditions

Full permit conditions

All 8 conditions for Houston adu permits.

A building permit is required to construct any ADU in Houston. Houston Permitting Center (HPC) processes all residential new construction and addition permits, including ADUs.
Houston is the largest city in the United States without a traditional zoning ordinance. There are no city-imposed use zones separating single-family from multi-family or accessory-dwelling uses — the primary land-use constraints come from private deed restrictions recorded with Harris County.
Deed restrictions recorded in the Harris County real property records are the primary rule-set homeowners must check before building an ADU. Many older subdivisions have deed restrictions that prohibit secondary dwelling units or limit structures to one residence per lot.
Because Houston has no citywide zoning ordinance, there is no city-imposed minimum lot size, maximum ADU floor area ratio, or mandatory setback rule for ADUs beyond the Houston Building Code and the 2021 IRC — though deed restrictions may impose their own limits.
Houston Building Code setback requirements generally mirror state and IRC minimums. Verify applicable minimum side and rear yard setbacks for your specific parcel through Houston Permitting Center before design.
Each ADU requires a residential building permit and must comply with the Houston Building Code, the 2021 IRC with local amendments, and applicable mechanical, electrical, and plumbing codes.
A separate address must be assigned to the ADU. Contact the Houston Permitting Center addressing unit before or concurrent with permit application.
Utility connections for an ADU must meet CenterPoint Energy (electric), Houston Public Works (water/sewer), and applicable tap and capacity requirements.

Fees

Estimated city fees

Baseline for a simple permitted adu: $1,200–$4,000+ in combined city permit, plan review, and trade permit fees is a practical Houston ADU planning range before deed-restriction review, utility tap, and addressing costs

Fee	Amount	Notes
Residential building permit fee	$400–$1,200 (estimated, based on construction valuation)	Houston Permitting Center calculates permit fees on a sliding scale based on declared construction value. An ADU as a new dwelling unit will be priced similarly to a small residential new construction project. Verify the current fee schedule at houstonpermittingcenter.org before submitting.
Plan review fee	Included or separate depending on project scope	Residential plan review is typically bundled with the building permit fee for standard submittals. Larger or more complex ADU projects may incur a separate plan review charge.
Trade permit fees (electrical, plumbing, mechanical)	$200–$700+ each depending on scope	Habitable ADUs require separate electrical, plumbing, and mechanical permits in addition to the main building permit.
Addressing and utility fees	Varies	A new residential address and any required new utility taps (water, sewer, electric) will add to project costs. Confirm CenterPoint and Houston Public Works requirements during pre-application.

Documents

Required documents

Residential new construction building permit application submitted through Houston Permitting Center online at houstonpermittingcenter.org or in person at 1002 Washington Ave., Houston, TX 77002.
Scaled site plan showing lot boundaries, existing structures, proposed ADU footprint, setback dimensions, driveway, and utility connection points.
Architectural floor plans and elevations showing interior layout, room sizes, ceiling heights, windows, doors, and exterior design.
Structural drawings with foundation, framing, and connection details compliant with the 2021 IRC and Houston Building Code.
Evidence of deed restriction review — a title search, deed restriction certificate, or written statement from the property owner confirming no applicable deed restriction prohibits the ADU.
Utility connection plan identifying water, sewer, and electrical service for the ADU.
Trade permit applications for electrical, plumbing, and mechanical work associated with the ADU.
Address assignment documentation from Houston Permitting Center addressing unit.

Timeline

Typical timing

Plan review: 10–15 business days for initial residential plan review
Total cycle: 8–14 weeks from application to final inspection

Houston Permitting Center's residential plan review turnaround varies by season and complexity. Trade permit reviews, deed restriction resolution, utility tap work, and inspection scheduling each add time. Projects without complications or resubmittals typically close in 8–10 weeks.

Process

How the permit process works

Check deed restrictions Because Houston has no zoning, private deed restrictions are the primary legal constraint on ADU construction. Search the Harris County Clerk's real property records (hcrecords.harriscountytx.gov) for any recorded deed restrictions affecting your parcel. Many Houston subdivisions prohibit secondary dwelling units or restrict structures to single-family residential use.
Confirm utility capacity and address assignment Contact Houston Public Works to confirm water and sewer capacity and tap requirements. Contact CenterPoint Energy for electric service requirements. Request an address for the ADU from Houston Permitting Center's addressing unit — a unique address is required before the permit application is processed.
Prepare permit documents Assemble a complete application package including site plan, architectural and structural drawings, and a utility connection plan. Confirm all dimensions comply with the Houston Building Code and 2021 IRC setback and structural requirements.
Submit permit application and pay fees Submit the residential new construction permit application at houstonpermittingcenter.org or in person at 1002 Washington Ave. Pay the calculated permit and plan review fees at submission. Houston Permitting Center will assign a plan reviewer and begin the plan review process.
Respond to plan review comments Plan reviewers evaluate the submittal against the 2021 IRC, Houston Building Code, and applicable energy, plumbing, and electrical codes. Respond to any correction notices and resubmit updated plans through the online portal or in person.
Obtain trade permits File electrical, plumbing, and mechanical permits for the ADU's systems. These can be submitted concurrently with or immediately after the main building permit approval.
Schedule inspections and close out permits Schedule required inspections — foundation, framing, rough-in trades, energy, and final — through Houston Permitting Center's online scheduling tool. Once all inspections pass and permits are finaled, the ADU is cleared for occupancy.

Code basis

What Houston reviews against

2021 International Residential Code (IRC) with local amendments adopted under the City of Houston Building Code; Houston Code of Ordinances Chapter 10 (Buildings) for structural and safety standards. No traditional zoning ordinance — land-use constraints come from recorded deed restrictions.

Residential permit page Houston permit portal

If you skip the permit

What can go wrong

Houston Permitting Center can issue a stop-work order and require after-the-fact permitting for any unpermitted dwelling unit, including teardown if the structure cannot be brought into code compliance.
Deed restriction violations can result in private litigation — neighboring property owners or a subdivision homeowner's association can seek injunctive relief to halt construction or require removal.
An unpermitted ADU without a certificate of occupancy cannot be lawfully occupied or rented.
Homeowner's insurance may deny claims for damage to or caused by an unpermitted structure not inspected for code compliance.
Unpermitted dwelling-unit work can become a title, insurance, and disclosure problem during a refinance or home sale.
Without a final permit and CO, rental income from the ADU may be legally and financially unprotected.