Cupertino, Santa Clara County

ADU / Guest House Cost in Cupertino, CA

Cupertino remodeling costs are 30% abovethe California state average. Here's what a typical adu / guest house costs in Cupertino in 2026, based on a 500 sqf project.

Budget
$162,500
$325/sqf
Mid-Range
$260,000
$520/sqf
High-End
$390,000
$780/sqf

Cost breakdown

Foundation & Framing
25%$65,000
Mechanical (HVAC, Plumbing, Electrical)
20%$52,000
Interior Finishes
20%$52,000
Exterior & Roofing
15%$39,000
Kitchen & Bath Fixtures
10%$26,000
Permits, Plans & Engineering
10%$26,000

Breakdown based on mid-range estimate of $260,000

Typical Timeline
4-8 months
Permits Required

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

Remodeling in Cupertino

Apple headquarters city with premium home values. Top-rated school district drives family demand. Homeowners invest heavily in kitchen and bathroom upgrades. Many contractors specialize in this market.

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 Cupertino

Kitchen Remodel
$39,000 – $117,000
Bathroom Remodel
$19,500 – $62,400
Room Addition
$78,000 – $214,500
Roof Replacement
$16,250 – $48,750
Exterior Paint
$6,500 – $22,750
Whole House Remodel
$351,000 – $1,170,000

ADU / Guest House cost in other California cities

Menlo Park
$168,750 – $405,000 | San Mateo County
San Francisco
$168,750 – $405,000 | San Francisco County
Sunnyvale
$156,250 – $375,000 | Santa Clara County
Daly City
$150,000 – $360,000 | San Mateo County
Los Angeles
$131,250 – $315,000 | Los Angeles County
Huntington Beach
$137,500 – $330,000 | Orange County
Sherman Oaks
$131,250 – $315,000 | Los Angeles County
Thousand Oaks
$131,250 – $315,000 | Ventura County

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