Newport Beach, Orange County

ADU / Guest House Cost in Newport Beach, CA

Newport Beach remodeling costs are 25% abovethe California state average. Here's what a typical adu / guest house costs in Newport Beach in 2026, based on a 500 sqf project.

Budget
$156,250
$313/sqf
Mid-Range
$250,000
$500/sqf
High-End
$375,000
$750/sqf

Cost breakdown

Foundation & Framing
25%$62,500
Mechanical (HVAC, Plumbing, Electrical)
20%$50,000
Interior Finishes
20%$50,000
Exterior & Roofing
15%$37,500
Kitchen & Bath Fixtures
10%$25,000
Permits, Plans & Engineering
10%$25,000

Breakdown based on mid-range estimate of $250,000

Typical Timeline
4-8 months
Permits Required

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

Remodeling in Newport Beach

Premium OC coastal market with high-end renovation demand. Many homes in the $2-5M+ range justifying major renovations. Coastal building and design review requirements add complexity.

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 Newport Beach

Kitchen Remodel
$37,500 – $112,500
Bathroom Remodel
$18,750 – $60,000
Room Addition
$75,000 – $206,250
Roof Replacement
$15,625 – $46,875
Exterior Paint
$6,250 – $21,875
Whole House Remodel
$337,500 – $1,125,000

ADU / Guest House cost in other California cities

Mission Viejo
$131,250 – $315,000 | Orange County
Castro Valley
$137,500 – $330,000 | Alameda County
San Ramon
$143,750 – $345,000 | Contra Costa County
Morgan Hill
$137,500 – $330,000 | Santa Clara County
Orinda
$156,250 – $375,000 | Contra Costa County
Hayward
$131,250 – $315,000 | Alameda County
Hillsborough
$175,000 – $420,000 | San Mateo County
Brentwood
$125,000 – $300,000 | Contra Costa County

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