ADU (Accessory Dwelling Unit) Cost in Texas (2026)
A adu (accessory dwelling unit) in Texas costs about $135/SF to $508/SF in 2026, or roughly $81,219–$304,571 for a typical project. These numbers adjust the U.S. baseline for Texas's construction labor rates, which run 4% above the national average (BLS QCEW: $38.45/hour).
ADU (Accessory Dwelling Unit) Cost per Square Foot in Texas
| Tier | U.S. baseline | Texas (2026) |
|---|---|---|
| Budget | $133/SF | $135/SF |
| Typical | $292/SF | $296/SF |
| High-end | $500/SF | $508/SF |
Texas adjustment factor: 1.015× the national baseline — applying the state's BLS construction wage index (1.04×) to the ~38% of hard cost that is labor. Materials are held at national prices.
About ADU (Accessory Dwelling Unit) Costs
An accessory dwelling unit is a self-contained living space with its own kitchen, bathroom, and entrance, built as a detached structure, a garage conversion, or an attached unit. Sizes commonly run 400 to 1,200 square feet. Because it includes a full kitchen and bath plus its own systems, it functions as a small house and carries house-level costs. Budget ADUs convert an existing garage. Higher-end projects build new detached units with quality finishes. Whether the unit is new construction or a conversion, and its size, set most of the cost.
Utility connections are a major driver, since a detached ADU may need new water, sewer, gas, and electrical service runs, sometimes with a separate meter. A garage conversion saves on shell cost but often needs a new foundation slab, insulation, and egress. Kitchens and bathrooms concentrate the most expensive trades into a small area. Site access for equipment, sewer capacity, and fire-separation requirements add cost. Permitting and impact fees vary widely and can be substantial. Full new construction runs $200 to $400 per square foot, while conversions run less.
Building in Texas
Texas construction wages average about $38.45 an hour, above the national $36.97, reflecting booming demand across Austin, Dallas-Fort Worth, Houston, and San Antonio. The state has no income tax, generally fast and business-friendly permitting, and right-to-work laws that keep union density low. Those advantages are offset by explosive population growth that strains crews and materials, plus a Gulf coast subject to hurricane wind-load and post-Harvey flood requirements that raise coastal build costs. Intense summer heat affects scheduling and cooling design. Labor demand fueled by in-migration is the dominant upward force on pricing in the major metros.
Frequently Asked Questions
How much does a adu (accessory dwelling unit) cost in Texas in 2026?
A adu (accessory dwelling unit) in Texas runs about $135/SF to $508/SF, with a typical project around $177,667. These figures adjust the national baseline for Texas's construction labor rates, which run 4% above the national average per BLS QCEW data.
Why do adu (accessory dwelling unit) costs differ by state?
Materials are priced nationally, but construction labor is local. Texas's average construction wage is $38.45/hour (4% above the U.S. average), and labor is roughly 38% of the hard cost of a adu (accessory dwelling unit). That labor difference is what moves the state number up or down from the national baseline.
Why is construction in Texas above the national average despite low taxes?
Booming demand is the reason. Rapid population and business growth in Austin, Dallas, and Houston strains the labor and materials supply, pushing wages to about $38.45 an hour even though taxes and permitting costs stay low.
How do hurricanes affect building on the Texas coast?
Gulf coast counties enforce hurricane wind-load standards, and after Hurricane Harvey many areas tightened flood-elevation rules. Coastal projects need stronger connections, impact-rated openings, and sometimes raised foundations, adding cost compared with inland Texas.
Is permitting fast in Texas?
Generally, yes. Texas takes a business-friendly approach, and many suburban jurisdictions issue permits quickly. Major cities like Austin can be slower for complex projects, but overall approval timelines are shorter than in heavily regulated coastal states.
Get a project-specific number with the free construction cost estimator, see the national picture in the adu (accessory dwelling unit) cost guide, or compare all building types in The 2026 Construction Cost Index.
Explore Texas construction data on the Texas dashboard.
State cost adjustment uses BLS QCEW construction wages (NAICS 23). Figures are 2026 planning ranges, not quotes — confirm with local bids before committing a budget.