ADU cost in 2026
Detached new-construction ADUs average $80,000–$350,000 turnkey. Garage-to-ADU conversions run $60,000–$150,000. Costs scale with square footage, finishes, and jurisdiction.
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$80,000–$350,000
Typical accessory dwelling unit in 2026, before applicable rebates and tax credits.
- $60,000–$150,000
Garage conversion
Existing footprint, fastest.
- $100,000–$250,000
Attached ADU
Shares wall with main home.
- $120,000–$220,000
Detached (small)
400–800 sq ft, 1 bed.
- $220,000–$400,000+
Detached (large)
1,000+ sq ft, 2+ bed.
Cost factors
Type
Detached new-build is most expensive; conversions and attached are cheaper.
Square footage
Most ADUs are 400–1,200 sq ft. Cost per sq ft drops with size.
Site work
Utility runs, grading, and foundation can add $15k–$50k.
Finish level
IKEA-grade vs. designer finishes can swing 40%+.
Permits & impact fees
Vary widely — California waives many; other states charge $5k–$30k.
By state
Labor, permitting, and material costs vary by state. These ranges scale the national average to your region.
| State | Typical range | |
|---|---|---|
| California | $108,000–$472,500 | ADUs in California → |
| Florida | $83,200–$364,000 | ADUs in Florida → |
| Illinois | $84,800–$371,000 | ADUs in Illinois → |
| New York | $102,400–$448,000 | ADUs in New York → |
| Texas | $80,000–$350,000 | ADUs in Texas → |
| Washington | $92,000–$402,500 | ADUs in Washington → |
ADU cost in 2026
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