Hermosa Beach, Los Angeles County

ADU / Guest House Cost in Hermosa Beach, CA

Hermosa Beach remodeling costs are 20% abovethe California state average. Here's what a typical adu / guest house costs in Hermosa Beach 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 Hermosa Beach

Small beach city with extremely high land values driving major renovations. Many older beach cottages being transformed into modern homes. Tight lots and narrow streets complicate construction access.

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 Hermosa Beach

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

Fullerton
$125,000 – $300,000 | Orange County
Carlsbad
$137,500 – $330,000 | San Diego County
El Monte
$112,500 – $270,000 | Los Angeles County
Redondo Beach
$137,500 – $330,000 | Los Angeles County
Modesto
$100,000 – $240,000 | Stanislaus County
San Clemente
$137,500 – $330,000 | Orange County
San Bernardino
$100,000 – $240,000 | San Bernardino County
Folsom
$118,750 – $285,000 | Sacramento County

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