San Leandro, Alameda County

ADU / Guest House Cost in San Leandro, CA

San Leandro remodeling costs are 10% abovethe California state average. Here's what a typical adu / guest house costs in San Leandro 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 San Leandro

More affordable East Bay city with strong remodeling value. Many 1940s-50s homes being modernized. Proximity to Oakland gives access to a large contractor pool.

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 San Leandro

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

Santa Cruz
$143,750 – $345,000 | Santa Cruz County
Dublin
$137,500 – $330,000 | Alameda County
Woodside
$168,750 – $405,000 | San Mateo County
Redwood City
$156,250 – $375,000 | San Mateo County
Novato
$143,750 – $345,000 | Marin County
Gilroy
$131,250 – $315,000 | Santa Clara County
Los Altos Hills
$175,000 – $420,000 | Santa Clara County
Mill Valley
$162,500 – $390,000 | Marin County

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