Garage Conversions: Chino vs Fontana
How do garage conversions rules compare between Chino, CA and Fontana, CA?
Chino has fewer restrictions than Fontana.
Chino, CA
San Bernardino County
California Gov. Code §65852.2 (now re-codified by SB 477 at Gov. Code §66310 et seq.) preempts local bans on converting an existing garage into an Accessory Dwelling Unit. Chino adopted a conforming ADU ordinance on March 17, 2020 (Chino Municipal Code Title 20). Garage-to-ADU conversions are permitted ministerially, replacement parking is NOT required when a garage is converted to an ADU, and approval must be issued within 60 days of a complete application.
View full Chino rules →Fontana, CA
San Bernardino County
Fontana allows garage conversions with a building permit. ADU conversions under Gov Code 65852.2 need no replacement parking, while non-ADU conversions may require two off-street spaces.
View full Fontana rules →Key Facts Comparison
| Fact | Chino | Fontana |
|---|---|---|
| State preemption | Gov. Code §65852.2 (now §66310 et seq. per SB 477) — local bans preempted | - |
| Chino ADU ordinance | Adopted March 17, 2020, CMC Title 20 | - |
| Replacement parking | NOT required when garage converts to ADU | Not required for ADU conversion, may be for non-ADU |
| Approval timeline | 60 days ministerial review of complete application | - |
| Owner occupancy | Not required for ADUs permitted 1/1/2020 – 1/1/2025 | - |
| ADU path | - | 60-day ministerial approval under GC 65852.2 |
| Building permit | - | Required for all conversions with structural and mechanical review |
| Minimum features | - | Kitchen, bath, heating, egress, smoke alarms for ADU |
| Wall replacement | - | Garage door must become permanent insulated wall |
Highlighted rows indicate differences between cities.
Chino FAQ
Can Chino deny my request to convert my garage into an ADU?
No, not categorically. State law (Gov. Code §65852.2 / SB 477 re-codification at §66310 et seq.) preempts local bans on garage-to-ADU conversions. Chino's March 17, 2020 ordinance under CMC Title 20 implements this state mandate.
Do I have to add a new driveway or parking space?
No. State law specifically exempts garage-to-ADU conversions from replacement parking requirements (Gov. Code §65852.2(a)(1)(D)(xi)).
How long does the City have to act on my application?
60 days from a complete application. ADU permits in California are ministerial — no discretionary hearing, no CEQA.
Fontana FAQ
Can I convert my Fontana garage into a rental unit?
Yes. An ADU conversion under state law lets you create a separate rentable unit with full kitchen and bath, and Fontana cannot require replacement parking.
Do I need permits to just turn the garage into a big bedroom?
Yes. Any conversion from garage to habitable space requires a building permit and must meet CRC standards for insulation, egress, and electrical.
Will I lose my parking if I convert the garage?
For ADU conversions, no - state law prohibits Fontana from requiring replacement parking. For non-ADU conversions, two off-street spaces may be required.
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