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ADU Cost in Houston

A builder-grade ADU (accessory dwelling unit) in Houston typically costs $120,000–$195,000, about $200–$325 per square foot for a ~600 sq ft ADU. The biggest cost drivers are foundation & framing, kitchen & bath, and roofing & exterior.

$120k–$195k

Most builder-grade 1 bedroom projects in Houston fall within this range.

What a builder-grade ADU typically includes

  • Foundation & framing
  • Basic kitchen & bath
  • Standard finishes
  • Mini-split heating & cooling
  • Code electrical & plumbing

What could push the cost higher

  • Utility connections & metering
  • Site access & grading
  • Permitting & impact fees
  • Sewer or septic tie-in

Where your budget goes

CategoryEstimated range
HVAC$8,400 – $13,700
Insulation & drywall$9,600 – $15,600
Flooring & finishes$10,800 – $17,600
Labor & project management$14,400 – $23,400
Roofing & exterior$15,600 – $25,400
Plumbing & electrical$15,600 – $25,400
Kitchen & bath$19,200 – $31,200
Foundation & framing$26,400 – $42,900

Think of this as a starting point for budgeting. We use recent Houston-area remodeling data and national cost benchmarks to estimate what projects like yours could cost. Final pricing can vary based on your home’s condition, design choices, and contractor. Most projects also benefit from a contingency budget to cover surprises along the way.

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Frequently asked questions

A builder-grade ADU (accessory dwelling unit) in Houston typically costs $120,000–$195,000, or about $200–$325 per square foot for a ~600 sq ft ADU. Most projects fall within this range; final pricing depends on your home’s condition, design choices, and contractor.

A builder-grade ADU (accessory dwelling unit) typically includes foundation & framing, basic kitchen & bath, standard finishes, mini-split heating & cooling, and code electrical & plumbing.

Common reasons a ADU (accessory dwelling unit) runs past its estimate include utility connections & metering, site access & grading, permitting & impact fees, and sewer or septic tie-in.

A mid-range ADU (accessory dwelling unit) typically runs $156,000–$254,000, versus $120,000–$195,000 for builder-grade, about $45,000 more at the typical estimate.

Mid-range ADU (accessory dwelling unit)High-end ADU (accessory dwelling unit)

Estimates based on recent Houston-area remodeling data and national cost benchmarks. They reflect typical Houston pricing for a builder-grade project, but keep in mind that this is a ballpark range. There are plenty of variables that may affect your pricing.