Tiny Homes: Downey vs Topanga
How do tiny homes rules compare between Downey, CA and Topanga, CA?
Downey and Topanga have similar restriction levels.
Downey, CA
Los Angeles County
Tiny homes on foundations in Downey are regulated as ADUs under CA Gov Code 65852.2. Tiny homes on wheels are treated as RVs and cannot be used as permanent dwellings. ADU rules allow up to 1,200 sq ft detached.
View full Downey rules →Topanga, CA
Los Angeles County
Tiny homes on permanent foundations are treated as ADUs under CA Gov Code 65852.2 and LA County's ADU ordinance in unincorporated areas. Tiny homes on wheels are not recognized as permanent dwellings. LA County allows ADUs up to 1,200 sq ft detached with 4 ft side/rear setbacks.
View full Topanga rules →Key Facts Comparison
| Fact | Downey | Topanga |
|---|---|---|
| On Foundation | Regulated as ADU | Treated as ADU, permitted |
| On Wheels | Treated as RV, not dwelling | Not allowed as permanent dwelling |
| Max Size | 1,200 sq ft detached ADU | - |
| State Law | CA Gov Code 65852.2 | CA Gov Code 65852.2 |
| Max ADU Size | - | 1,200 sq ft detached |
Highlighted rows indicate differences between cities.
Downey FAQ
Can I put a tiny home in my backyard?
Possibly under Downey ADU rules if on a permanent foundation. Tiny homes on wheels face stricter zoning limitations.
What is the minimum house size?
Downey typically requires 400 to 800+ square feet for a primary dwelling. ADU rules may allow smaller secondary units.
Topanga FAQ
Can I put a tiny home in my backyard in unincorporated LA County?
Yes, if it's on a permanent foundation and meets ADU requirements. Detached units up to 1,200 sq ft are allowed with 4-foot setbacks. You need a building permit from LA County Building & Safety.
Can I live in a tiny home on wheels in LA County?
No. Tiny homes on wheels are classified as recreational vehicles and cannot be used as permanent dwellings. They can be parked on your property subject to RV parking rules but cannot be connected to utilities as a residence.
What permits do I need for a tiny home ADU?
You need a building permit from LA County Building & Safety. Under state law, ADU permits must be approved ministerially (no discretionary review) within 60 days if plans comply with standards. Contact (626) 458-3171.
Compare other topics
See how Downey and Topanga compare on other ordinance categories.
Want to add a third city?
Use our full comparison tool to compare up to three cities.
Open Comparison Tool