San Francisco, San Francisco County

ADU / Guest House Cost in San Francisco, CA

San Francisco remodeling costs are 35% abovethe California state average. Here's what a typical adu / guest house costs in San Francisco in 2026, based on a 500 sqf project.

Budget
$168,750
$338/sqf
Mid-Range
$270,000
$540/sqf
High-End
$405,000
$810/sqf

Cost breakdown

Foundation & Framing
25%$67,500
Mechanical (HVAC, Plumbing, Electrical)
20%$54,000
Interior Finishes
20%$54,000
Exterior & Roofing
15%$40,500
Kitchen & Bath Fixtures
10%$27,000
Permits, Plans & Engineering
10%$27,000

Breakdown based on mid-range estimate of $270,000

Typical Timeline
4-8 months
Permits Required

Building, electrical, plumbing, mechanical. May require plan check.

Remodeling in San Francisco

San Francisco has the highest remodeling costs in California. Permitting is notoriously slow (3-6 months for major projects), Victorian-era homes require specialized skills, and labor costs reflect the Bay Area cost of living. Seismic retrofitting is required for many pre-1978 buildings.

California allows ADUs on most residential lots since 2020. An ADU adds living space and rental income. Cities must approve or deny within 60 days of a complete application.

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Other projects in San Francisco

Kitchen Remodel
$40,500 – $121,500
Bathroom Remodel
$20,250 – $64,800
Room Addition
$81,000 – $222,750
Roof Replacement
$16,875 – $50,625
Exterior Paint
$6,750 – $23,625
Whole House Remodel
$364,500 – $1,215,000

ADU / Guest House cost in other California cities

Mission Viejo
$131,250 – $315,000 | Orange County
San Carlos
$156,250 – $375,000 | San Mateo County
Pleasanton
$143,750 – $345,000 | Alameda County
Danville
$150,000 – $360,000 | Contra Costa County
San Leandro
$137,500 – $330,000 | Alameda County
Vallejo
$118,750 – $285,000 | Solano County
Newark
$137,500 – $330,000 | Alameda County
Mill Valley
$162,500 – $390,000 | Marin County

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