Woodside, San Mateo County

Room Addition Cost in Woodside, CA

Woodside remodeling costs are 35% abovethe California state average. Here's what a typical room addition costs in Woodside in 2026, based on a 300 sqf project.

Budget
$81,000
$270/sqf
Mid-Range
$141,750
$473/sqf
High-End
$222,750
$743/sqf

Cost breakdown

Foundation & Framing
30%$42,525
Roofing & Exterior
15%$21,263
Mechanical (HVAC, Electrical)
15%$21,263
Interior Finishes
20%$28,350
Windows & Doors
10%$14,175
Permits & Engineering
10%$14,175

Breakdown based on mid-range estimate of $141,750

Typical Timeline
3-6 months
Permits Required

Building permit, structural engineering, possibly zoning approval.

Remodeling in Woodside

Rural-feeling town in the hills with large lots and significant setbacks. Hillside construction adds foundation and grading costs. Fire-safe building requirements are strictly enforced.

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 Woodside

Kitchen Remodel
$40,500 – $121,500
Bathroom Remodel
$20,250 – $64,800
ADU / Guest House
$168,750 – $405,000
Roof Replacement
$16,875 – $50,625
Exterior Paint
$6,750 – $23,625
Whole House Remodel
$364,500 – $1,215,000

Room Addition cost in other California cities

Hillsborough
$84,000 – $231,000 | San Mateo County
San Rafael
$72,000 – $198,000 | Marin County
Sausalito
$78,000 – $214,500 | Marin County
Dublin
$66,000 – $181,500 | Alameda County
Pacifica
$72,000 – $198,000 | San Mateo County
Culver City
$66,000 – $181,500 | Los Angeles County
Daly City
$72,000 – $198,000 | San Mateo County
El Monte
$54,000 – $148,500 | Los Angeles County

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