Direct answer
The short version
An ADU is an accessory unit on a property. SB 9 is a separate California housing law path for certain two-unit developments and urban lot splits. They can affect strategy, but they are not the same decision.
San Jose scope
Where this applies
For San Jose homeowners, ADUOS treats SB 9 as a separate planning question, not the default ADU answer. Eligibility depends on the parcel and current law.
ADUOS checks
What we check first
- Whether the homeowner is asking for an ADU or a split/development pathModeled
- Whether SB 9 should be screened as a separate possibilityVerified
- Whether the parcel has obvious disqualifying uncertaintyNeeds review
- Whether ADU and SB 9 assumptions are being mixed incorrectlyModeled
- Whether the next step should be legal or planning reviewNeeds review
What could change this
The answer can move
- Parcel eligibilityNeeds review
- Hazard, historic, or other state-law exclusionsNeeds review
- Local objective standardsNeeds review
- A land-use professional's reviewNeeds review
Source notes
Why the label matters
SB 9 discussion must use current HCD guidance and stay cautious. Do not present SB 9 as a guaranteed path from a shallow address screen.
FAQ
Common follow-ups
Is SB 9 an ADU law?
No. It is a separate state housing path. ADUs and SB 9 can both matter, but they answer different questions.
Should I use SB 9 instead of an ADU?
That depends on property eligibility, goals, financing, and legal review. ADUOS should screen it cautiously, not promise it.