Larkspur, Marin County

ADU / Guest House Cost in Larkspur, CA

Larkspur remodeling costs are 25% abovethe California state average. Here's what a typical adu / guest house costs in Larkspur in 2026, based on a 500 sqf project.

Budget
$156,250
$313/sqf
Mid-Range
$250,000
$500/sqf
High-End
$375,000
$750/sqf

Cost breakdown

Foundation & Framing
25%$62,500
Mechanical (HVAC, Plumbing, Electrical)
20%$50,000
Interior Finishes
20%$50,000
Exterior & Roofing
15%$37,500
Kitchen & Bath Fixtures
10%$25,000
Permits, Plans & Engineering
10%$25,000

Breakdown based on mid-range estimate of $250,000

Typical Timeline
4-8 months
Permits Required

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

Remodeling in Larkspur

Central Marin community with ferry access to SF. Mix of downtown condos and hillside homes. The city is relatively permitting-friendly. Flood zone considerations near Corte Madera Creek.

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 Larkspur

Kitchen Remodel
$37,500 – $112,500
Bathroom Remodel
$18,750 – $60,000
Room Addition
$75,000 – $206,250
Roof Replacement
$15,625 – $46,875
Exterior Paint
$6,250 – $21,875
Whole House Remodel
$337,500 – $1,125,000

ADU / Guest House cost in other California cities

Los Altos Hills
$175,000 – $420,000 | Santa Clara County
San Marcos
$118,750 – $285,000 | San Diego County
Culver City
$137,500 – $330,000 | Los Angeles County
Dublin
$137,500 – $330,000 | Alameda County
Sherman Oaks
$131,250 – $315,000 | Los Angeles County
South San Francisco
$150,000 – $360,000 | San Mateo County
Walnut Creek
$143,750 – $345,000 | Contra Costa County
Fullerton
$125,000 – $300,000 | Orange County

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