Garage Conversions: San Leandro vs Sunol
How do garage conversions rules compare between San Leandro, CA and Sunol, CA?
San Leandro and Sunol have similar restriction levels.
San Leandro, CA
Alameda County
Garage conversions to ADUs are streamlined in San Leandro under state ADU law. Replacement parking cannot be required near transit.
View full San Leandro rules →Sunol, CA
Alameda County
Garage conversions to ADUs in unincorporated Sunol are governed by Alameda County Code Title 17, Chapter 17.55 (adopted 2024) and California Government Code §65852.2. No replacement parking is required when a garage is converted, and the existing garage's setbacks are preserved. Most Sunol parcels are on septic systems requiring Alameda County Environmental Health review.
View full Sunol rules →Key Facts Comparison
| Fact | San Leandro | Sunol |
|---|---|---|
| ADU Conversion | Ministerial | - |
| Replacement Parking | Not required near transit | Not required |
| Building Code | Full habitability | - |
| Non-ADU Use | Permit required | - |
| Review Time | 60 days | - |
| Governing Code | - | Alameda Co. Code §17.55 |
| Existing Setbacks | - | Preserved for conversion |
| JADU Cap | - | 500 sq ft (within primary) |
| Septic Review | - | Alameda Co. EH required |
Highlighted rows indicate differences between cities.
San Leandro FAQ
Do I have to build new parking if I convert my garage in San Leandro?
Not if the property is within half a mile of public transit. Most of San Leandro qualifies due to BART and AC Transit coverage.
Who enforces this in San Leandro?
San Leandro code enforcement at (510) 577-3394 handles most complaints. Alameda County agencies handle regional issues.
Sunol FAQ
Do I need to replace parking if I convert my Sunol garage to an ADU?
No. Cal. Gov Code §65852.2 and Alameda County Code §17.55 prohibit the County from requiring replacement parking when an existing garage is converted to an ADU.
Are existing garage setbacks grandfathered for a Sunol conversion?
Yes. Under state ADU law as implemented by Alameda County Code §17.55, the existing footprint and setbacks of the garage are preserved for the conversion. Only added square footage must meet the 4-foot new-construction setback.
Do I need septic approval for my Sunol garage-conversion ADU?
Yes for parcels on septic systems. Alameda County Environmental Health reviews septic capacity for the added bedroom load before the building permit is issued.
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