HOME Phase 1 lets lots zoned SF-1, SF-2 and SF-3 hold up to three units. A detached ADU or an attached unit can provide rental income or family housing. Costs per square foot run higher than for a simple addition, because each unit needs its own kitchen, bath and utilities.
What additions & adus typically costs in Austin
| Scope | Typical range (estimate) | What that usually covers |
|---|---|---|
| Basic room (500 sq ft) | $127,500 – $204,000 | bedroom/family room, simple roofline |
| With bath or kitchenette (500 sq ft) | $178,500 – $255,000 | adds plumbing |
| Second story / high-end (500 sq ft) | $255,000 – $382,500 | structural work, premium finishes |
| Detached ADU (500–800 sq ft) | $180,000 – $350,000+ | Design, utilities, foundation, full finishes |
Planning estimates for typical projects, not quotes. Your bids will depend on size, condition, materials and permit requirements.
Before you design
- Check zoning, deed restrictions and HOA rules
- Map trees and critical root zones
- Confirm water, wastewater and electrical capacity
Austin project cost estimator
Planning estimate
$142,800 – $204,000
Rough planning range only — not a quote. Real bids depend on site conditions, permits, materials and the contractor.
Additions & ADUs: common questions
Does HOME override my HOA?
No. Private deed restrictions and HOA covenants can still limit what you build.
Where we match additions & adus projects
Austin · Round Rock · Cedar Park & Leander · Georgetown · Pflugerville & Hutto · West Lake Hills & Westlake · Lakeway & Bee Cave · Kyle & Buda