What an ADU costs in Hawthorne (2026)
Hawthorne runs its own ADU permits and offers free pre-approved ADU plans. Here are typical numbers, the local rules, and your next step.
Typical ADU numbers in Hawthorne
- A 750 sq ft backyard ADU with a standard finish costs about $300,000 to build, all in: building, site work, city fees and design.
- Typical ADU rent: about $3,750 a month for 750 sq ft.
- Home value nearby: about $650 per sq ft (County median area).
Run the free ADU and new home cost calculator for Hawthorne
ADU permits and local rules in Hawthorne
Who runs permits
City of Hawthorne Planning Division and Building, through the Citizen Self Service portal.
Pre-approved ADU plans
Yes. Hawthorne offers three free pre-approved ADU plan sets you can download.
What can slow you down
- Grading, drainage and fire sprinklers may need separate permits.
- LA County Fire must sign off before the permit is issued.
- Homes near LAX flight paths may need sound-blocking features.
Sources: City of Hawthorne Pre-Approved ADU Plans page. State ADU law. General information, not legal advice. Updated October 2026.
Free lot check in Hawthorne
Send Hemisphere A&E your address. We look up your zoning and lot size, what fits (ADU, junior ADU, SB 9, new home, apartments, remodel or business space), red flags like fire zones or hillside rules, and a rough cost range. No cost, no pressure. Email info@hemisphereae.com or call (619) 762-7144.
More cost guides for Hawthorne
- What a new home costs in Hawthorne
- What a restaurant, shop or office build-out costs in Hawthorne
- What an apartment building costs in Hawthorne
Cost guides for more of LA County
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