ADU Cost & Rules in Sacramento, CA
Planning an accessory dwelling unit in Sacramento? Here are the current construction cost ranges, permit fees, and the zoning rules that apply to most residential lots — compiled from city and state requirements and 2026 regional cost data.
- Maximum ADU size
- 1200 sq ft
- Minimum lot size
- No minimum lot size (state law)
- Setbacks
- 4 ft side and rear
- Owner-occupancy required
- Not required
- Typical permit & city fees
- $3,500 – $12,000
- Typical timeline (design → done)
- 6–12 months
How much does an ADU cost in Sacramento?
A detached new-build ADU in Sacramento typically costs $150,000 – $320,000, while a garage conversion runs $75,000 – $140,000. Permit and city fees add $3,500 – $12,000, and most projects take 6–12 months from design to completion.
Do you need a permit to build an ADU in Sacramento?
Yes. Every ADU in Sacramento requires building permits, with typical city and permit fees of $3,500 – $12,000. Setback requirements are 4 ft side and rear, and owner occupancy is not required.
How big can an ADU be in Sacramento?
ADUs in Sacramento can be up to 1200 sq ft. No minimum lot size (state law). Local note: Development impact fees are waived for ADUs under 750 sq ft under state law, and Sacramento's pre-approved plan sets can cut 30+ days off permitting. Permits are processed ministerially within 60 days.
Cost breakdown for Sacramento (2026)
- Detached new-build ADU
- $150,000 – $320,000
- Garage conversion
- $75,000 – $140,000
Local note: Development impact fees are waived for ADUs under 750 sq ft under state law, and Sacramento's pre-approved plan sets can cut 30+ days off permitting. Permits are processed ministerially within 60 days.
Get an estimate for your project
Ranges above assume typical lots and standard finishes. For a number tailored to your size, type, and finish level, run the calculator:
Open the ADU Cost Calculator →Figures reflect published city fee schedules and 2026 regional construction data; rules change — confirm with the Sacramento planning department before designing. Last reviewed 2026.