Check your lot
State rules applied from the HCD 2026 ADU Handbook and Gov. Code; local add-ons from each city's current ordinances.
Feasibility result
What adds on top
Feasibility is based on state law floors and published local rules — parcel-specific overlays (historic districts, very-high fire zones, floodplains) can add conditions. Confirm with the city's ADU handout before finalizing plans.
Why this exists
Most homeowners — and plenty of designers — don't know the state already decided: a qualifying ADU cannot be denied on discretionary grounds. No design review board, no neighbor veto, no minimum lot size. Cities can still apply objective standards, and a few add local steps (Berkeley's neighbor noticing, hillside fire rules). This checker separates what the state guarantees from what your city adds.
State rules: HCD 2026 ADU Handbook, Gov. Code §§ 66314+. Local rules labeled per city below from current ordinances.