Menlo Park, San Mateo County

ADU / Guest House Cost in Menlo Park, CA

Menlo Park remodeling costs are 35% abovethe California state average. Here's what a typical adu / guest house costs in Menlo Park in 2026, based on a 500 sqf project.

Budget
$168,750
$338/sqf
Mid-Range
$270,000
$540/sqf
High-End
$405,000
$810/sqf

Cost breakdown

Foundation & Framing
25%$67,500
Mechanical (HVAC, Plumbing, Electrical)
20%$54,000
Interior Finishes
20%$54,000
Exterior & Roofing
15%$40,500
Kitchen & Bath Fixtures
10%$27,000
Permits, Plans & Engineering
10%$27,000

Breakdown based on mid-range estimate of $270,000

Typical Timeline
4-8 months
Permits Required

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

Remodeling in Menlo Park

Meta/Facebook headquarters has driven home values and remodeling demand through the roof. Contractors charge premium rates. Many homeowners do complete gut renovations of modest ranch homes.

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 Menlo Park

Kitchen Remodel
$40,500 – $121,500
Bathroom Remodel
$20,250 – $64,800
Room Addition
$81,000 – $222,750
Roof Replacement
$16,875 – $50,625
Exterior Paint
$6,750 – $23,625
Whole House Remodel
$364,500 – $1,215,000

ADU / Guest House cost in other California cities

Corte Madera
$150,000 – $360,000 | Marin County
Lafayette
$150,000 – $360,000 | Contra Costa County
Palm Desert
$118,750 – $285,000 | Riverside County
Half Moon Bay
$150,000 – $360,000 | San Mateo County
Stockton
$106,250 – $255,000 | San Joaquin County
Milpitas
$143,750 – $345,000 | Santa Clara County
Elk Grove
$112,500 – $270,000 | Sacramento County
Sacramento
$112,500 – $270,000 | Sacramento County

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