What an ADU costs in Malibu (2026)
All of Malibu is in the Coastal Zone, and many lots are rebuilding after wildfires. Here are typical numbers, the local rules, and your next step.
Typical ADU numbers in Malibu
- 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 $5,650 a month for 750 sq ft.
- Home value nearby: about $1,600 per sq ft (Prime area).
Run the free ADU and new home cost calculator for Malibu
ADU permits and local rules in Malibu
Who runs permits
City of Malibu Planning Department, and Building Safety in the Environmental Sustainability Department.
Fire rebuild help
Fire rebuilds follow the city rebuild steps. We didn't find a pre-approved ADU plan program. Ask us for the latest.
What can slow you down
- Every ADU must meet the Coastal Act and Malibu's Local Coastal Program.
- Most lots use septic, which must be checked or upgraded.
- Fire rebuilds after Woolsey, Franklin and Palisades fires have their own steps and deadlines.
Sources: City of Malibu ADU page; City of Malibu fire rebuild FAQ. State ADU law. General information, not legal advice. Updated October 2026.
Free lot check in Malibu
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 Malibu
- What a new home costs in Malibu
- What a restaurant, shop or office build-out costs in Malibu
- What an apartment building costs in Malibu
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