Concord, Contra Costa County

ADU / Guest House Cost in Concord, CA

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

Budget
$125,000
$250/sqf
Mid-Range
$200,000
$400/sqf
High-End
$300,000
$600/sqf

Cost breakdown

Foundation & Framing
25%$50,000
Mechanical (HVAC, Plumbing, Electrical)
20%$40,000
Interior Finishes
20%$40,000
Exterior & Roofing
15%$30,000
Kitchen & Bath Fixtures
10%$20,000
Permits, Plans & Engineering
10%$20,000

Breakdown based on mid-range estimate of $200,000

Typical Timeline
4-8 months
Permits Required

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

Remodeling in Concord

Largest city in Contra Costa County with affordable remodeling costs for the Bay Area. Many 1960s-70s homes due for updates. The former Naval Weapons Station redevelopment is boosting the area.

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 Concord

Kitchen Remodel
$30,000 – $90,000
Bathroom Remodel
$15,000 – $48,000
Room Addition
$60,000 – $165,000
Roof Replacement
$12,500 – $37,500
Exterior Paint
$5,000 – $17,500
Whole House Remodel
$270,000 – $900,000

ADU / Guest House cost in other California cities

Santa Barbara
$150,000 – $360,000 | Santa Barbara County
Walnut Creek
$143,750 – $345,000 | Contra Costa County
Menlo Park
$168,750 – $405,000 | San Mateo County
Gilroy
$131,250 – $315,000 | Santa Clara County
Milpitas
$143,750 – $345,000 | Santa Clara County
Saratoga
$168,750 – $405,000 | Santa Clara County
San Francisco
$168,750 – $405,000 | San Francisco County
Belmont
$156,250 – $375,000 | San Mateo County

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