Milpitas, Santa Clara County

ADU / Guest House Cost in Milpitas, CA

Milpitas remodeling costs are 15% abovethe California state average. Here's what a typical adu / guest house costs in Milpitas in 2026, based on a 500 sqf project.

Budget
$143,750
$288/sqf
Mid-Range
$230,000
$460/sqf
High-End
$345,000
$690/sqf

Cost breakdown

Foundation & Framing
25%$57,500
Mechanical (HVAC, Plumbing, Electrical)
20%$46,000
Interior Finishes
20%$46,000
Exterior & Roofing
15%$34,500
Kitchen & Bath Fixtures
10%$23,000
Permits, Plans & Engineering
10%$23,000

Breakdown based on mid-range estimate of $230,000

Typical Timeline
4-8 months
Permits Required

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

Remodeling in Milpitas

Growing city at the north end of San Jose. Many newer homes (1990s-2000s) with cosmetic update needs. More affordable than neighboring cities, attracting first-time renovators.

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 Milpitas

Kitchen Remodel
$34,500 – $103,500
Bathroom Remodel
$17,250 – $55,200
Room Addition
$69,000 – $189,750
Roof Replacement
$14,375 – $43,125
Exterior Paint
$5,750 – $20,125
Whole House Remodel
$310,500 – $1,035,000

ADU / Guest House cost in other California cities

Fairfax
$143,750 – $345,000 | Marin County
Huntington Beach
$137,500 – $330,000 | Orange County
Santa Barbara
$150,000 – $360,000 | Santa Barbara County
Danville
$150,000 – $360,000 | Contra Costa County
Los Angeles
$131,250 – $315,000 | Los Angeles County
Fullerton
$125,000 – $300,000 | Orange County
Concord
$125,000 – $300,000 | Contra Costa County
Palo Alto
$168,750 – $405,000 | Santa Clara County

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