Direct answer
The short version
A garage conversion can be a strong ADU path when existing space avoids some lot-fit problems. It still needs review for code, structure, utilities, legal status, access, and whether the conversion path matches the homeowner's goal.
San Jose scope
Where this applies
San Jose and state sources recognize converted or repurposed existing-space paths. ADUOS keeps the property-specific answer Modeled until enough evidence exists.
ADUOS checks
What we check first
- Whether conversion is the likely path or only a fallbackModeled
- Whether the existing structure is represented in the case evidenceNeeds review
- Whether utilities or building condition create review needsNeeds review
- Whether the path fits family, rental, or flexibility goalsModeled
- Whether a JADU distinction mattersVerified
What could change this
The answer can move
- Garage conditionNeeds review
- Prior permits or legal statusNeeds review
- Ceiling height, foundation, and life-safety reviewNeeds review
- Utility separation or metering requirementsNeeds review
Source notes
Why the label matters
Public data can point toward a conversion path, but existing-structure condition often needs human review.
FAQ
Common follow-ups
Is a garage conversion always cheaper?
No. Existing walls can help, but structure, utilities, and code work can still make the project expensive.
Can ADUOS verify the garage condition?
Not from public data alone. Garage condition and code readiness should stay Needs review until better evidence exists.