San Rafael, Marin County

ADU / Guest House Cost in San Rafael, CA

San Rafael remodeling costs are 20% abovethe California state average. Here's what a typical adu / guest house costs in San Rafael 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 Rafael

Marin's county seat with diverse housing stock from downtown condos to hillside estates. The city processes permits relatively efficiently for Marin. Earthquake retrofitting is common in older 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 Rafael

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

Fresno
$100,000 – $240,000 | Fresno County
Half Moon Bay
$150,000 – $360,000 | San Mateo County
San Mateo
$156,250 – $375,000 | San Mateo County
Cupertino
$162,500 – $390,000 | Santa Clara County
Milpitas
$143,750 – $345,000 | Santa Clara County
Los Gatos
$162,500 – $390,000 | Santa Clara County
Atherton
$175,000 – $420,000 | San Mateo County
Morgan Hill
$137,500 – $330,000 | Santa Clara County

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