San Bernardino, San Bernardino County

ADU / Guest House Cost in San Bernardino, CA

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

Budget
$100,000
$200/sqf
Mid-Range
$160,000
$320/sqf
High-End
$240,000
$480/sqf

Cost breakdown

Foundation & Framing
25%$40,000
Mechanical (HVAC, Plumbing, Electrical)
20%$32,000
Interior Finishes
20%$32,000
Exterior & Roofing
15%$24,000
Kitchen & Bath Fixtures
10%$16,000
Permits, Plans & Engineering
10%$16,000

Breakdown based on mid-range estimate of $160,000

Typical Timeline
4-8 months
Permits Required

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

Remodeling in San Bernardino

Among the most affordable remodeling markets in the state. Labor costs are significantly lower than coastal areas, making major renovations more accessible.

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 Bernardino

Kitchen Remodel
$24,000 – $72,000
Bathroom Remodel
$12,000 – $38,400
Room Addition
$48,000 – $132,000
Roof Replacement
$10,000 – $30,000
Exterior Paint
$4,000 – $14,000
Whole House Remodel
$216,000 – $720,000

ADU / Guest House cost in other California cities

Richmond
$131,250 – $315,000 | Contra Costa County
Elk Grove
$112,500 – $270,000 | Sacramento County
Riverside
$106,250 – $255,000 | Riverside County
Palm Springs
$118,750 – $285,000 | Riverside County
Fremont
$143,750 – $345,000 | Alameda County
Walnut Creek
$143,750 – $345,000 | Contra Costa County
Del Mar
$150,000 – $360,000 | San Diego County
San Francisco
$168,750 – $405,000 | San Francisco County

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