San Anselmo, Marin County

ADU / Guest House Cost in San Anselmo, CA

San Anselmo remodeling costs are 20% abovethe California state average. Here's what a typical adu / guest house costs in San Anselmo in 2026, based on a 500 sqf project.

Budget
$150,000
$300/sqf
Mid-Range
$240,000
$480/sqf
High-End
$360,000
$720/sqf

Cost breakdown

Foundation & Framing
25%$60,000
Mechanical (HVAC, Plumbing, Electrical)
20%$48,000
Interior Finishes
20%$48,000
Exterior & Roofing
15%$36,000
Kitchen & Bath Fixtures
10%$24,000
Permits, Plans & Engineering
10%$24,000

Breakdown based on mid-range estimate of $240,000

Typical Timeline
4-8 months
Permits Required

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

Remodeling in San Anselmo

Ross Valley community with Craftsman and cottage-style homes. The downtown core has an artsy character. Flood zone properties near San Anselmo Creek require specific considerations.

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 Anselmo

Kitchen Remodel
$36,000 – $108,000
Bathroom Remodel
$18,000 – $57,600
Room Addition
$72,000 – $198,000
Roof Replacement
$15,000 – $45,000
Exterior Paint
$6,000 – $21,000
Whole House Remodel
$324,000 – $1,080,000

ADU / Guest House cost in other California cities

Richmond
$131,250 – $315,000 | Contra Costa County
Menlo Park
$168,750 – $405,000 | San Mateo County
Fairfax
$143,750 – $345,000 | Marin County
South San Francisco
$150,000 – $360,000 | San Mateo County
Concord
$125,000 – $300,000 | Contra Costa County
Mill Valley
$162,500 – $390,000 | Marin County
Petaluma
$137,500 – $330,000 | Sonoma County
West Hollywood
$150,000 – $360,000 | Los Angeles County

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