San Bruno, San Mateo County

ADU / Guest House Cost in San Bruno, CA

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

Mid-Peninsula location near SFO. Many 1950s-70s homes being updated with modern kitchens and baths. More affordable entry point to Peninsula living.

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 Bruno

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

Los Altos
$168,750 – $405,000 | Santa Clara County
Castro Valley
$137,500 – $330,000 | Alameda County
Petaluma
$137,500 – $330,000 | Sonoma County
Benicia
$125,000 – $300,000 | Solano County
Antioch
$118,750 – $285,000 | Contra Costa County
Concord
$125,000 – $300,000 | Contra Costa County
Burlingame
$162,500 – $390,000 | San Mateo County
Folsom
$118,750 – $285,000 | Sacramento County

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