ADUs and JADUs
ADU rules in Los Angeles: size, height, and setbacks (2026)
The 800 sq ft guarantee, 16 ft height, and 4 ft setbacks. | Reviewed Oct 17, 2026
State ADU vs. LA Ordinance ADU: which route fits your lot
800 sq ft with strong protections, or up to 1,200 sq ft with conditions. | Reviewed Oct 17, 2026
Permits and process
How long do LA ADU permits take? The 60-day rule explained
15 business days for completeness, 60 days to decide. | Reviewed Oct 17, 2026
Do I need an engineer for my LA addition or ADU?
The one-story line, basements, and when plans need a stamp. | Reviewed Oct 17, 2026
More guides
Guide to building an ADU in Los Angeles
ADU types, the design and permit process, and what to know before you start.
How much does an ADU cost in Los Angeles?
What drives the number, and the ranges we see.
Cost to build a custom home in Los Angeles
The cost drivers on a new build.
Design-build vs. architect and contractor
How the two models compare on accountability, budget, and speed.