Santa Clara, Santa Clara County

ADU / Guest House Cost in Santa Clara, CA

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

Mix of older neighborhoods and newer developments near Levi's Stadium. More affordable entry point to Silicon Valley. The city processes permits faster than most neighboring cities.

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 Santa Clara

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

Sausalito
$162,500 – $390,000 | Marin County
Culver City
$137,500 – $330,000 | Los Angeles County
Ventura
$125,000 – $300,000 | Ventura County
Fullerton
$125,000 – $300,000 | Orange County
San Diego
$125,000 – $300,000 | San Diego County
Sherman Oaks
$131,250 – $315,000 | Los Angeles County
Long Beach
$125,000 – $300,000 | Los Angeles County
Los Angeles
$131,250 – $315,000 | Los Angeles County

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