Woodside, San Mateo County

ADU / Guest House Cost in Woodside, CA

Woodside remodeling costs are 35% abovethe California state average. Here's what a typical adu / guest house costs in Woodside in 2026, based on a 500 sqf project.

Budget
$168,750
$338/sqf
Mid-Range
$270,000
$540/sqf
High-End
$405,000
$810/sqf

Cost breakdown

Foundation & Framing
25%$67,500
Mechanical (HVAC, Plumbing, Electrical)
20%$54,000
Interior Finishes
20%$54,000
Exterior & Roofing
15%$40,500
Kitchen & Bath Fixtures
10%$27,000
Permits, Plans & Engineering
10%$27,000

Breakdown based on mid-range estimate of $270,000

Typical Timeline
4-8 months
Permits Required

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

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.

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 Woodside

Kitchen Remodel
$40,500 – $121,500
Bathroom Remodel
$20,250 – $64,800
Room Addition
$81,000 – $222,750
Roof Replacement
$16,875 – $50,625
Exterior Paint
$6,750 – $23,625
Whole House Remodel
$364,500 – $1,215,000

ADU / Guest House cost in other California cities

Sunnyvale
$156,250 – $375,000 | Santa Clara County
Belmont
$156,250 – $375,000 | San Mateo County
San Jose
$156,250 – $375,000 | Santa Clara County
Del Mar
$150,000 – $360,000 | San Diego County
Pomona
$112,500 – $270,000 | Los Angeles County
Irvine
$137,500 – $330,000 | Orange County
Santa Monica
$150,000 – $360,000 | Los Angeles County
Beverly Hills
$162,500 – $390,000 | Los Angeles County

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