Huntington Beach · Orange County

ADU builder in Huntington Beach.

INVICTA designs, permits and builds detached ADUs, garage conversions and junior ADUs in Huntington Beach — including lots in the coastal zone.

Get my free feasibility report (562) 310-3596

Detached ADUs
Garage conversions
Junior ADUs
Coastal zone

Wrigley 2-story: 4-car garage + 800 sf ADU · Long Beach, CA

Permits in Huntington Beach

What to know before you build in Huntington Beach.

Ministerial reviewHuntington Beach reviews ADUs and junior ADUs ministerially — no public hearing for a compliant project.Source: Huntington Beach ADUs
Pre-approved planThe HB Pre-Approved ADU Plan is a one-story, 490 sf detached unit. It can’t be modified.Source: Huntington Beach ADUs
Coastal zoneLots in the coastal zone may need a Coastal Development Permit. Permit Center: 2000 Main St, 714-536-5271.Source: Huntington Beach ADUs

Summarized from official sources as of October 2026. Rules change — your free feasibility report checks the current rules for your exact lot.

California ADU law

State law sets the floor.

Every California city, including Huntington Beach, has to follow these state rules.

See what applies to my lot

3 unitsOn a single-family lot, state law allows a new detached ADU, a converted ADU and a junior ADU together. Source
800 sfCities must allow a detached ADU of at least 800 sf with 4 ft side and rear setbacks. Source
No owner ruleCities can’t require you to live on the property to build or rent an ADU. Source
750 sfADUs of 750 sf or less can’t be charged impact fees. Source
15 daysThe city must tell you within 15 business days whether your application is complete. Source

What we build

One team, design to keys.

Detached ADUsBackyard homes from studios to 2-story units.
Garage conversionsTurn an unused garage into a rental or family suite.
ADU over garageKeep the parking, add a home above it.
Additions & remodelsPrimary suites, second stories, kitchens and baths.

Built by INVICTA

Recent projects near Huntington Beach.

Full ADU portfolio →

Long Beach, CAWrigley 2-story: 4-car garage + 800 sf ADU

Long Beach, CA 90808800 sf 2 bed, 2 bath backyard ADU

East Long Beach, CATwo ADUs + a garage on a triplex lot

FAQ

Huntington Beach ADU questions.

Ask about your lot

Does Huntington Beach have a pre-approved ADU plan?

Yes. It’s a one-story, 490 sf detached plan that can’t be modified. If you want a different size or layout, we design a custom ADU for your lot.

Do I need a Coastal Development Permit for an ADU in Huntington Beach?

Possibly. Lots in the coastal zone may need one. Your feasibility report tells you whether your lot is affected.

Do you work in other Orange County cities?

Yes. We serve Huntington Beach, Seal Beach, Los Alamitos, La Habra and other OC cities.

Free feasibility report

What could your Huntington Beach lot build?

Send us your address. We’ll check your zoning, lot size, setbacks and utilities and send a written report on how many ADUs fit, what they’d cost and the path to permits — free.

What you can buildHow many units, what size and where they fit on your lot
Rules for your cityZoning, setbacks, height and state ADU law applied to your property
Utilities & accessSewer, water, power and the path to the back of the lot
Budget & rentA realistic cost range and what comparable units rent for

Other cities we serve