Direct answer
The short version
The biggest blockers are usually not the idea of an ADU. They are property-specific facts: the parcel match, setbacks, buildable space, access, utilities, easements, existing structures, and evidence gaps that need review before money is spent.
San Jose scope
Where this applies
This page is for San Jose homeowners. It describes screening blockers, not a final city decision.
ADUOS checks
What we check first
- Whether the address resolves to the right parcelModeled
- Whether lot and zoning sources agreeModeled
- Whether the likely path conflicts with setbacks or existing structuresModeled
- Whether access or utilities create an early risk flagModeled
- Which blocker should be resolved before deeper decisionsNeeds review
What could change this
The answer can move
- A survey-grade parcel boundaryNeeds review
- A utility or panel photoNeeds review
- A title/easement reviewNeeds review
- A city or professional interpretation of a close-call site conditionNeeds review
Source notes
Why the label matters
Official sources define the process and rules. ADUOS ranks blockers as Modeled until the missing property evidence is resolved.
FAQ
Common follow-ups
Should I pay for plans before checking blockers?
Usually no. A basic feasibility screen should come before full design spend, especially when parcel or utility evidence is still unclear.
Can ADUOS remove a blocker?
No. ADUOS identifies the blocker and the next evidence needed. A designer, surveyor, utility, or city reviewer may still need to resolve it.