Direct answer
The short version
ADUOS screens detached ADU, attached ADU, existing-space or garage conversion, and JADU as separate options. The strongest path depends on the lot, existing home, access, utilities, and what the homeowner is trying to accomplish.
San Jose scope
Where this applies
San Jose and California sources distinguish ADUs from JADUs. ADUOS screens both only inside its supported San Jose scope.
ADUOS checks
What we check first
- Whether detached space appears plausibleModeled
- Whether attached or conversion paths avoid obvious lot conflictsModeled
- Whether a JADU path depends on existing interior spaceModeled
- Whether the path creates utility, parking, or access review itemsNeeds review
- Which path is the strongest current fitModeled
What could change this
The answer can move
- Interior layout evidenceNeeds review
- Garage condition and legal statusNeeds review
- Utility service constraintsNeeds review
- Homeowner goal: family use, rental income, or flexible spaceModeled
Source notes
Why the label matters
The ADU and JADU categories are source-backed. The ranking is property-specific and should be treated as Modeled unless enough evidence is verified.
FAQ
Common follow-ups
Is detached always better?
No. Detached can be appealing, but attached or conversion paths may be more realistic when lot space or access is tight.
Is a JADU the same as an ADU?
No. A JADU is a distinct path with its own limits and requirements. It can be useful, but it should not be treated as a shortcut without review.