Irvine, Orange County

ADU / Guest House Cost in Irvine, CA

Irvine remodeling costs are 10% abovethe California state average. Here's what a typical adu / guest house costs in Irvine in 2026, based on a 500 sqf project.

Budget
$137,500
$275/sqf
Mid-Range
$220,000
$440/sqf
High-End
$330,000
$660/sqf

Cost breakdown

Foundation & Framing
25%$55,000
Mechanical (HVAC, Plumbing, Electrical)
20%$44,000
Interior Finishes
20%$44,000
Exterior & Roofing
15%$33,000
Kitchen & Bath Fixtures
10%$22,000
Permits, Plans & Engineering
10%$22,000

Breakdown based on mid-range estimate of $220,000

Typical Timeline
4-8 months
Permits Required

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

Remodeling in Irvine

Irvine's planned communities have HOA restrictions that affect exterior remodeling. Many homes are relatively new (1990s-2010s), so remodels tend to be cosmetic upgrades rather than structural.

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 Irvine

Kitchen Remodel
$33,000 – $99,000
Bathroom Remodel
$16,500 – $52,800
Room Addition
$66,000 – $181,500
Roof Replacement
$13,750 – $41,250
Exterior Paint
$5,500 – $19,250
Whole House Remodel
$297,000 – $990,000

ADU / Guest House cost in other California cities

Fairfax
$143,750 – $345,000 | Marin County
Danville
$150,000 – $360,000 | Contra Costa County
Half Moon Bay
$150,000 – $360,000 | San Mateo County
Pacifica
$150,000 – $360,000 | San Mateo County
Novato
$143,750 – $345,000 | Marin County
Santa Clara
$150,000 – $360,000 | Santa Clara County
Castro Valley
$137,500 – $330,000 | Alameda County
South San Francisco
$150,000 – $360,000 | San Mateo County

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