Garage Conversions: Vacaville vs Vallejo
How do garage conversions rules compare between Vacaville, CA and Vallejo, CA?
Vacaville and Vallejo have similar restriction levels.
Vacaville, CA
Solano County
Vacaville permits conversion of an existing attached or detached garage into an ADU under VMC 14.09.122 and California Government Code 66320(a)(1). No replacement parking is required (Gov. Code 66321(a)(2)). State default 4-foot side and rear setbacks apply for new construction within the existing garage footprint. Building permits and Title 24 energy compliance are required.
View full Vacaville rules →Vallejo, CA
Solano County
Vallejo allows conversion of an existing garage to an ADU or JADU under VMC Chapter 16.303 and California Government Code §65852.2. Replacement parking is not required when a garage, carport, or covered parking structure is physically replaced by an ADU.
View full Vallejo rules →Key Facts Comparison
| Fact | Vacaville | Vallejo |
|---|---|---|
| State Authority | Gov. Code 66320(a)(1) | - |
| Replacement Parking | Not required (Gov. Code 66321(a)(2)) | Not required when garage replaced |
| Side/Rear Setback | 4 ft state default | - |
| Energy Code | Title 24 insulation/heat pump | - |
| Local Section | VMC 14.09.122 | - |
| Code Section | - | VMC Ch. 16.303; Cal. Gov Code §65852.2 |
| Existing Setbacks | - | Preserved for conversion |
| JADU Max Size | - | 500 sq ft (attached only) |
| Permit Timeline | - | 60 days ministerial |
Highlighted rows indicate differences between cities.
Vacaville FAQ
Do I have to replace parking when I convert my Vacaville garage?
No. California Government Code 66321(a)(2) prohibits Vacaville from requiring replacement parking when an existing garage is converted to an ADU. This is one of the most homeowner-friendly aspects of the state ADU law and is fully implemented in VMC 14.09.122.
Can I keep part of my garage and convert the rest?
Yes - a partial conversion is permitted under California Government Code 66320, but the remaining garage portion and the new ADU portion must be separated by a fire-rated wall and self-closing door meeting California Residential Code requirements. The Vacaville Building Division inspects both spaces.
Vallejo FAQ
Do I have to replace parking if I convert my Vallejo garage to an ADU?
No. VMC Chapter 16.303 expressly states that replacement parking is not required when an existing garage, carport, or covered parking structure is physically replaced by an ADU.
Can my Vallejo converted garage be a JADU?
Yes, if the garage is attached to the single-family dwelling. The JADU is capped at 500 sq ft, must be within the walls of the primary home, and triggers owner-occupancy recorded by deed restriction.
Do I need a permit to convert a Vallejo garage to living space?
Yes. Vallejo Building Services requires a building permit for any change of use from garage to habitable space. Decisions on complete ADU applications are issued within 60 days.
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