Garage Conversions: Ontario vs San Bernardino
How do garage conversions rules compare between Ontario, CA and San Bernardino, CA?
Ontario and San Bernardino have similar restriction levels.
Ontario, CA
San Bernardino County
Ontario allows garage-to-ADU conversions under Gov Code 65852.2 with no replacement parking required. Non-ADU conversions to living space still need a building permit and must replace covered parking.
View full Ontario rules →San Bernardino, CA
San Bernardino County
Garage conversions in San Bernardino are usually done as ADUs under CA Gov Code 65852.2, which waives replacement parking. Non-ADU conversions must meet habitable-space code and replace parking.
View full San Bernardino rules →Key Facts Comparison
| Fact | Ontario | San Bernardino |
|---|---|---|
| ADU conversion | Gov Code 65852.2 | - |
| Replacement parking | Not required for ADU | - |
| Permit type | Building permit required | - |
| Egress | Bedroom window or door | - |
| Non-ADU conversion | Parking must be replaced | Must replace displaced parking under zoning |
| ADU route | - | Garage-to-ADU conversions waive replacement parking under state law |
| Habitability | - | Must meet 7 ft ceiling, egress, smoke and CO, insulation |
| Permits required | - | Building plus electrical, plumbing, and mechanical |
| Fire zones | - | Chapter 7A may apply in VHFHSZ foothills |
Highlighted rows indicate differences between cities.
Ontario FAQ
Can Ontario make me add another parking space when I convert my garage to an ADU?
No. State law prohibits requiring replacement parking when a garage is converted to an ADU, even if the original garage provided the home's only covered parking.
Do I need a permit to turn my garage into a home gym?
Yes. Any conversion of garage space to living space requires a building permit, insulation, egress, and often a change-of-use review even if it is not an ADU.
San Bernardino FAQ
Can I convert my garage to a rental unit?
Yes, as an ADU under Gov Code 65852.2; the city must approve ministerially and cannot require replacement parking.
Do I have to add a new parking space if I convert the garage to a bedroom?
For non-ADU bonus-room conversions, yes. Zoning typically requires you to replace the displaced covered parking; not so for ADU conversions.
What about an illegal garage conversion done by a prior owner?
You must legalize the work first by pulling permits, disclosing the conversion, and bringing it up to current code or restoring it as a garage.
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