Ross, Marin County

ADU / Guest House Cost in Ross, CA

Ross remodeling costs are 40% abovethe California state average. Here's what a typical adu / guest house costs in Ross in 2026, based on a 500 sqf project.

Budget
$175,000
$350/sqf
Mid-Range
$280,000
$560/sqf
High-End
$420,000
$840/sqf

Cost breakdown

Foundation & Framing
25%$70,000
Mechanical (HVAC, Plumbing, Electrical)
20%$56,000
Interior Finishes
20%$56,000
Exterior & Roofing
15%$42,000
Kitchen & Bath Fixtures
10%$28,000
Permits, Plans & Engineering
10%$28,000

Breakdown based on mid-range estimate of $280,000

Typical Timeline
4-8 months
Permits Required

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

Remodeling in Ross

One of the most exclusive communities in Marin - median home values over $4M. Estate-scale renovations with premium materials and custom everything. Architectural review is rigorous and slow.

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 Ross

Kitchen Remodel
$42,000 – $126,000
Bathroom Remodel
$21,000 – $67,200
Room Addition
$84,000 – $231,000
Roof Replacement
$17,500 – $52,500
Exterior Paint
$7,000 – $24,500
Whole House Remodel
$378,000 – $1,260,000

ADU / Guest House cost in other California cities

Santa Monica
$150,000 – $360,000 | Los Angeles County
Glendale
$131,250 – $315,000 | Los Angeles County
Fairfax
$143,750 – $345,000 | Marin County
San Luis Obispo
$131,250 – $315,000 | San Luis Obispo County
Milpitas
$143,750 – $345,000 | Santa Clara County
Elk Grove
$112,500 – $270,000 | Sacramento County
Woodside
$168,750 – $405,000 | San Mateo County
Woodland Hills
$131,250 – $315,000 | Los Angeles County

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