Hawthorne · Los Angeles County

ADU builder in Hawthorne.

In Hawthorne we turned a garage into a 600 sf, 2 bed, 2 bath rental. We design, permit and build garage conversions and detached ADUs across the city.

Get my free feasibility report (562) 310-3596

Garage conversions
Detached ADUs
Pre-approved plans
Rentals

600 sf garage to a 2 bed, 2 bath rental · Hawthorne, CA

Permits in Hawthorne

What to know before you build in Hawthorne.

Pre-approved ADU plansHawthorne offers three pre-approved ADU plans, submitted through the city’s Citizen Self Service portal.Source: Hawthorne pre-approved ADU plans
Fire approvalAn LA County Fire Department approval letter is required before the ADU permit is issued.Source: Hawthorne pre-approved ADU plans
Planning questionsHawthorne Planning answers setback and zoning questions at (310) 349-2970.Source: Hawthorne Planning

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 Hawthorne, 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 Hawthorne.

Full ADU portfolio →

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FAQ

Hawthorne ADU questions.

Ask about your lot

Can I convert my garage to an ADU in Hawthorne?

Yes, in most cases. Our Hawthorne project turned a garage into a 600 sf, 2 bed, 2 bath rental. The feasibility report checks your structure, utilities and fire access.

Does Hawthorne have pre-approved ADU plans?

Yes. Hawthorne offers three pre-approved plans. We check whether one fits your lot or a custom design makes more sense.

Do I need fire department approval for an ADU in Hawthorne?

Yes. Hawthorne requires an LA County Fire Department approval letter before the permit is issued. We handle that submittal.

Free feasibility report

What could your Hawthorne 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