Houston at a Glance
2.3M
Population
—
Parcels
—
Median Lot
—
Median Assessed
Building Code Requirements
These are the key dimensions and limits that govern what you can build in Houston. Every project — whether it's a new home, ADU, remodel, or addition — must comply with these requirements.
35'
Max Height
25'
Front Setback
5'
Side Setback
15'
Rear Setback
65%
Lot Coverage
2
Parking / Unit
Values shown are for standard single-family residential zones. Multi-family zones, commercial zones, and overlay districts have different requirements. View all Houston zone tables →
What You Can Build in Houston
Texas has no statewide housing density laws — development rules are set entirely by Houston's local code. Here's what governs residential construction in your area.
ADU Rules — Local Regulation
City CodeTexas has no statewide ADU law — rules are set entirely by local zoning code. ADU allowances vary by zoning district and may require conditional use permits, owner occupancy, or minimum lot sizes. Check your specific zone for ADU eligibility.
Texas Building Standards
IBC/IRCConstruction follows the International Building Code (IBC) and International Residential Code (IRC) as locally adopted. Texas does not have a mandatory statewide building code — each city adopts and enforces its own version with local amendments.
Frequently Asked Questions
Can I build an ADU in Houston, TX? +
ADU rules in Texas are set at the city level — there's no statewide ADU law. Houston has no traditional zoning, so ADUs are generally permitted as long as they meet building code, setback, and lot coverage requirements under the city's development ordinances.
Does Houston have zoning? +
Houston is the only major U.S. city without traditional zoning. Instead, it uses deed restrictions, land use ordinances, and building codes to regulate development. You still need to meet setback, parking, and lot coverage requirements.
What building code does Houston use? +
Houston follows the International Building Code (IBC) and International Residential Code (IRC) as adopted locally. Texas has no mandatory statewide building code — cities adopt and enforce codes with local amendments.
What does an ADU cost to build in Harris County? +
ADU construction in Harris County, TX typically ranges from $80,000 to $300,000 depending on size, finishes, and site conditions. Texas's lower labor and material costs often make ADU construction more affordable than coastal states.