Rancho Cucamonga, San Bernardino County

ADU / Guest House Cost in Rancho Cucamonga, CA

Rancho Cucamonga remodeling costs are 10% belowthe California state average. Here's what a typical adu / guest house costs in Rancho Cucamonga in 2026, based on a 500 sqf project.

Budget
$112,500
$225/sqf
Mid-Range
$180,000
$360/sqf
High-End
$270,000
$540/sqf

Cost breakdown

Foundation & Framing
25%$45,000
Mechanical (HVAC, Plumbing, Electrical)
20%$36,000
Interior Finishes
20%$36,000
Exterior & Roofing
15%$27,000
Kitchen & Bath Fixtures
10%$18,000
Permits, Plans & Engineering
10%$18,000

Breakdown based on mid-range estimate of $180,000

Typical Timeline
4-8 months
Permits Required

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

Remodeling in Rancho Cucamonga

Upscale Inland Empire city with newer housing stock. Mountain views drive premium pricing for some neighborhoods. One of the more desirable IE cities for renovation investment.

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 Rancho Cucamonga

Kitchen Remodel
$27,000 – $81,000
Bathroom Remodel
$13,500 – $43,200
Room Addition
$54,000 – $148,500
Roof Replacement
$11,250 – $33,750
Exterior Paint
$4,500 – $15,750
Whole House Remodel
$243,000 – $810,000

ADU / Guest House cost in other California cities

Poway
$125,000 – $300,000 | San Diego County
Half Moon Bay
$150,000 – $360,000 | San Mateo County
South San Francisco
$150,000 – $360,000 | San Mateo County
Livermore
$131,250 – $315,000 | Alameda County
Berkeley
$156,250 – $375,000 | Alameda County
Santa Rosa
$137,500 – $330,000 | Sonoma County
Vallejo
$118,750 – $285,000 | Solano County
Mill Valley
$162,500 – $390,000 | Marin County

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