Gilroy, Santa Clara County

ADU / Guest House Cost in Gilroy, CA

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

Budget

$131,250

$263/sqf

Mid-Range

$210,000

$420/sqf

High-End

$315,000

$630/sqf

Cost breakdown

Foundation & Framing

25%$52,500

Mechanical (HVAC, Plumbing, Electrical)

20%$42,000

Interior Finishes

20%$42,000

Exterior & Roofing

15%$31,500

Kitchen & Bath Fixtures

10%$21,000

Permits, Plans & Engineering

10%$21,000

Breakdown based on mid-range estimate of $210,000

Typical Timeline

4-8 months

Permits Required

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

Remodeling in Gilroy

Southernmost Silicon Valley city with the most affordable remodeling costs in Santa Clara County. Hot summers make HVAC and insulation priorities. Growing bedroom community.

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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