Texas ADU Laws, Costs & Permit Guide (2026)
Texas ADU rules are set at the city level — there is no state preemption. Austin is the most ADU-friendly major city; Houston has no zoning. Dallas and other cities are more restrictive.
Texas ADU At a Glance
Permit Timeline
60–120 days (Austin); varies widely elsewhere
Average Build Cost
$100,000 – $250,000
Maximum Size
Varies by city (Austin: up to 1,100 sq ft)
Owner-Occupancy Required
Varies by city
Impact Fees
Varies by city
Setbacks
Varies; Austin requires 5 ft rear and side
Recent Law Changes in Texas
Austin expanded ADU allowances citywide, permitting ADUs on most single-family lots and streamlining the approval process.
Find ADU Contractors in Texas
Browse vetted builders, architects, permit expediters, and ADU lenders serving Texas homeowners.
Browse Texas Contractors →Frequently Asked Questions — ADUs in Texas
Are ADUs legal in Texas?
ADU rules in Texas are set by individual cities, not the state. Austin, Houston (no zoning), and San Antonio allow ADUs in most areas. Dallas and Fort Worth have more restrictive zoning — check your city's specific ordinance.
How much does an ADU cost in Texas?
Texas ADU costs typically range from $100,000 to $250,000, lower than coastal states due to lower labor costs. Austin tends to run higher. Garage conversions can be significantly less expensive.
Sources
Disclaimer: The information on this page is provided for general informational purposes only and does not constitute legal, financial, or construction advice. ADU regulations change frequently — always verify current rules with your local planning department and consult a licensed professional before making decisions. ADUHomeResource.com is not liable for any errors, omissions, or outcomes resulting from use of this information.