BUYER GUIDE · A PRACTICAL GUIDE
An extra unit deserves its own due diligence.
An ADU can change how you use a property. Before making it part of your buying decision, let's understand what exists, how it's approved and what owning it would involve.
Match the listing description to the records.
Ask for the permit history, approved plans and completion records for the additional unit. Compare those documents with the space you walk through. A kitchen, separate entrance or attractive renovation does not independently establish that the unit is approved for the advertised use.
California HCD's ADU Handbook provides statewide background. For the property itself, confirm the relevant jurisdiction and ask its building or planning staff about the records and any unresolved questions. We can help organize that review before you rely on the ADU in your purchase plan.
Inspect how the two homes work together.
Look at access, outdoor areas, privacy, parking arrangements and utility connections as one property. Then have the appropriate inspectors assess each structure and its systems. Ask what is shared, what can be serviced independently and whether the physical arrangement matches your intended use.
Walk the route from the street to each entrance. Think about deliveries, maintenance access and everyday activities. These observations won't replace inspections, but they help you ask specific questions. A layout that works for relatives may need a different discussion if you intend to rent both spaces.
Verify the rental picture before counting the income.
If someone already occupies the unit, obtain the tenancy information through the transaction and have it reviewed appropriately. Do not assume you can change the rent, terminate occupancy or take possession on your preferred date. Existing agreements and applicable protections matter to your plan.
If the unit is vacant, keep any suggested rent clearly labeled as an estimate. Ask your lender how the ADU and potential income are treated for your application, and obtain insurance information for the intended use. Your comfortable budget should reflect the answers, not just the listing's income potential.
Put unanswered questions on the transaction calendar.
List what needs an answer, who can provide it and when the contract requires a decision. Records, inspections, lending and insurance may move on different schedules. We can help coordinate the real estate side so an important question doesn't get lost between those conversations.
Bring the listing and explain whether you want space for family, rental use or flexibility over time. We'll help evaluate the whole purchase, including the main home. The additional unit should support your goals without distracting from the condition, cost and daily usefulness of the property you're buying.
A useful next step.
Buying with renovation or ADU plans →
Buying Your First Rental Property on the Central Coast →
ADU Property Feasibility: Central Coast Planning Questions →
Published October 18, 2026. Local resources can change; check current requirements for your property with the relevant agency or professional.