Can your basement become an ADU?
Start with the existing building. A separate kitchen does not by itself establish a legal dwelling.
Inspect the shell before drawing rooms
- Measure finished ceiling height below beams and ducts, not just at the center of the room.
- Document water entry, damp walls, drainage and radon concerns. Resolve the cause before covering walls.
- Have a qualified professional evaluate foundation changes and any proposed window or stair openings.
Plan a safe, comfortable unit
- Ask the building department which sleeping-room escape openings, stair geometry and exit route apply.
- Confirm required fire separation, alarms and any shared mechanical-system limitations.
- Plan sound control at ceilings, plumbing walls and doors. Check ventilation and heating/cooling capacity.
Trace the utility work
- Locate sewer elevations and determine whether fixtures can drain by gravity.
- Check electrical panel capacity and where a kitchen exhaust route can terminate.
- Define responsibility for shared meters, internet, laundry and maintenance access before renting.
Prepare the permit conversation
- Bring a measured plan showing existing and proposed rooms, entrances and parking.
- Ask which inspections are required before existing work can be covered.
- Request a written scope separating repairs, code upgrades, finishes and permit fees.
Turn the checklist into a project plan
Record each open question, the person responsible, evidence needed and target date. Confirm requirements with the city and your licensed design/build professionals.
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Planning guidance. Requirements depend on the property, design and adopted local codes; this guide does not certify compliance. How our guidance is prepared