Alameda, Alameda County

ADU / Guest House Cost in Alameda, CA

Alameda remodeling costs are 15% abovethe California state average. Here's what a typical adu / guest house costs in Alameda 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 Alameda

Island city with charming Victorian and Craftsman homes. Limited contractor access (two entry points) can affect scheduling. Historic preservation requirements in certain districts add design constraints.

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.

Have estimates for your Alameda project?

Upload them and get an AI-powered comparison with CSLB license verification. Free.

Compare Estimates →

Other projects in Alameda

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

West Hollywood
$150,000 – $360,000 | Los Angeles County
Mountain View
$162,500 – $390,000 | Santa Clara County
Sausalito
$162,500 – $390,000 | Marin County
Danville
$150,000 – $360,000 | Contra Costa County
South San Francisco
$150,000 – $360,000 | San Mateo County
Hayward
$131,250 – $315,000 | Alameda County
Santa Rosa
$137,500 – $330,000 | Sonoma County
Half Moon Bay
$150,000 – $360,000 | San Mateo County

Get a personalized estimate

Use our interactive cost estimator to adjust square footage and see detailed pricing for your specific project.

Open Cost Estimator →