Moraga, Contra Costa County

ADU / Guest House Cost in Moraga, CA

Moraga remodeling costs are 20% abovethe California state average. Here's what a typical adu / guest house costs in Moraga in 2026, based on a 500 sqf project.

Budget
$150,000
$300/sqf
Mid-Range
$240,000
$480/sqf
High-End
$360,000
$720/sqf

Cost breakdown

Foundation & Framing
25%$60,000
Mechanical (HVAC, Plumbing, Electrical)
20%$48,000
Interior Finishes
20%$48,000
Exterior & Roofing
15%$36,000
Kitchen & Bath Fixtures
10%$24,000
Permits, Plans & Engineering
10%$24,000

Breakdown based on mid-range estimate of $240,000

Typical Timeline
4-8 months
Permits Required

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

Remodeling in Moraga

Small Lamorinda town with a community feel. Homes set in hills and canyons. Fire safety requirements add scope to exterior projects. Limited local contractors means most come from Walnut Creek or Oakland.

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 Moraga

Kitchen Remodel
$36,000 – $108,000
Bathroom Remodel
$18,000 – $57,600
Room Addition
$72,000 – $198,000
Roof Replacement
$15,000 – $45,000
Exterior Paint
$6,000 – $21,000
Whole House Remodel
$324,000 – $1,080,000

ADU / Guest House cost in other California cities

Fairfax
$143,750 – $345,000 | Marin County
Burbank
$125,000 – $300,000 | Los Angeles County
Fremont
$143,750 – $345,000 | Alameda County
Daly City
$150,000 – $360,000 | San Mateo County
Gilroy
$131,250 – $315,000 | Santa Clara County
San Francisco
$168,750 – $405,000 | San Francisco County
Berkeley
$156,250 – $375,000 | Alameda County
Morgan Hill
$137,500 – $330,000 | Santa Clara County

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