ADU rules in Anaheim
The key facts first, then what we've learned building there.
The snapshot
Checked October 2026. We re-check every lot against the current code.
Anaheim
| Rule | Answer |
|---|---|
| Detached ADU size | Up to 1,200 sq ft |
| Setbacks | 4 ft side and rear |
| Height | 16 ft; 18 ft near transit; 25 ft attached |
| Garage conversions | Many 1950s and 1960s homes have attached two-car garages, ideal for a conversion or a JADU |
| Fire zones | Anaheim Hills is in fire hazard zones, with ember-resistant construction and access review |
| Utilities | Anaheim Public Utilities |
| SB 1211 apartment ADUs | Yes |
| Building department | Anaheim Planning and Building |
What's different here
Anaheim has a large stock of 1950s and 1960s ranch homes with attached two-car garages. They make some of the simplest, least costly ADUs and JADUs.
In the hills, fire hazard zones bring ember-resistant materials and access checks. We check the zone first.
Anaheim runs its own utility, with its own process for new service and panel upgrades. We request it early.
What applies here
The garage becomes a home. No new setbacks, no replacement parking.
Learn moreUp to 500 sq ft carved out of the house you have.
Learn moreSince January 2025, California lets an existing apartment property add detached ADUs, one for every existing unit up to eight, plus conversions of garages and storage.
Learn moreCities must now keep a set of pre-approved ADU plans.
Learn morePlans that fit
Ready-drawn plans we adapt to your lot and your city.
Ask about your address
We check the lot against these rules and tell you what fits.