Corte Madera, Marin County

Room Addition Cost in Corte Madera, CA

Corte Madera remodeling costs are 20% abovethe California state average. Here's what a typical room addition costs in Corte Madera in 2026, based on a 300 sqf project.

Budget
$72,000
$240/sqf
Mid-Range
$126,000
$420/sqf
High-End
$198,000
$660/sqf

Cost breakdown

Foundation & Framing
30%$37,800
Roofing & Exterior
15%$18,900
Mechanical (HVAC, Electrical)
15%$18,900
Interior Finishes
20%$25,200
Windows & Doors
10%$12,600
Permits & Engineering
10%$12,600

Breakdown based on mid-range estimate of $126,000

Typical Timeline
3-6 months
Permits Required

Building permit, structural engineering, possibly zoning approval.

Remodeling in Corte Madera

Small Marin town with strong schools and family demand. Many 1960s-70s homes being updated. Christmas Tree Hill area has unique hillside construction challenges.

A room addition adds square footage and value to your home. Costs depend on whether it's a simple bump-out, a second story, or a full wing addition with plumbing.

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Other projects in Corte Madera

Kitchen Remodel
$36,000 – $108,000
Bathroom Remodel
$18,000 – $57,600
ADU / Guest House
$150,000 – $360,000
Roof Replacement
$15,000 – $45,000
Exterior Paint
$6,000 – $21,000
Whole House Remodel
$324,000 – $1,080,000

Room Addition cost in other California cities

Arcadia
$66,000 – $181,500 | Los Angeles County
Castro Valley
$66,000 – $181,500 | Alameda County
South San Francisco
$72,000 – $198,000 | San Mateo County
Sunnyvale
$75,000 – $206,250 | Santa Clara County
Alameda
$69,000 – $189,750 | Alameda County
Los Gatos
$78,000 – $214,500 | Santa Clara County
Dublin
$66,000 – $181,500 | Alameda County
Lafayette
$72,000 – $198,000 | Contra Costa County

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