ADU Construction in Newport Beach
Serving 92660 · 92661 · 92662 · 92663 and Costa Mesa, Irvine, Huntington Beach
An accessory dwelling unit in Newport Beach runs into a question that inland cities never face: a detached ADU is new construction, and new construction inside the coastal zone is exactly what a coastal development permit reviews. State ADU law is permissive and it has not been repealed at the coast — but the coastal review still exists, and pretending otherwise is how a project stalls.
Real projects. Real prices.
73 finished remodels published with their final price — nothing hidden.
What our finished LA work actually cost: 27 kitchens ran $23k–$84k, median $50k; 28 bathrooms $28k–$105k, median $38k; 17 whole-home remodels $36k–$440k, median $150k. Real final prices from our own job records, not estimates.
$33,000 A backlit mirror over a double vanity, with stone-look tile and matte black fittings throughout.
$35,000 A patterned encaustic-look floor, a sage shaker vanity and a glass shower with a tiled bench.
$41,000 Espresso shaker cabinetry, light quartz counters and a linear glass mosaic backsplash.
$84,000 Warm grey shaker cabinetry with quartz counters, plus floating vanities in dark stone tile.
$238,000 A walnut-fronted quartz island, arched openings, and sage-green stacked tile baths.
$275,000 A broad quartz island, a curved staircase with iron balusters, marble-look baths.
ADUs inside the coastal zone
Two rule sets, both real
State ADU law sets what a city must allow. The coastal zone sets an additional review for development within it. They operate together. Newport Beach issues both the building permit and, since 2017, the coastal development permit, so at least the counter is the same one.
Lot size is not the only test
Setbacks, existing coverage, access and where services already run matter as much as square footage. Plenty of generous-looking lots have one constraint that decides the whole design, and it is better to find it on paper.
Written by Onn Cohen-Meguri, founder and designer at Design Onn Point — 12+ years in business, 1,200+ finished Los Angeles projects. CSLB #1133368.
Pricing in Newport Beach
Market estimate, not our own project data.
Talk to Onn about your Newport Beach adu construction.
Free consult, no obligation. Onn reads every inquiry personally — and aims to reply within one business day.
From the blog
ADU vs Garage Conversion: Which Adds More Value in LA?
Side-by-side comparison of detached ADUs and garage conversions for LA homeowners — costs, timelines, ROI, rental income, and which one adds more value on resale.
LA County Kitchen Permits Explained (2026 Edition)
When you need a permit for an LA kitchen remodel, how LADBS plan-check works, typical timelines, and how to avoid the common mistakes.