What should I know about ADUs?

An ADU (Accessory Dwelling Unit) is a smaller secondary home on the same lot as a primary residence and, on the Monterey Peninsula, it can affect everything from permits and site constraints to value, resale, and buyer demand. For buyers and sellers, the main issue is not just whether an ADU exists, but whether it was properly permitted, fits the lot, and can be used the way the owner expects.

What is an ADU, and how is it different from a guest house or JADU?

An ADU is a self-contained living unit with its own kitchen, sleeping area, and bathroom. That is different from a guest house, which may not have full cooking facilities, and from a JADU, which is smaller and tied more closely to the main home. The distinction matters because financing, insurance, disclosure, and legal use can all depend on how the space is classified.

Can I assume an ADU is legal if it looks finished?

No. A finished space is not the same as a permitted ADU, and that is one of the biggest risks in a transaction. Buyers should verify permits, final inspections, and whether the improvement matches the approved plans. Sellers should be ready to disclose what was built, when it was built, and whether any part was done without permits, because that can affect price, lender review, and closing.

What site issues can make an ADU harder to build or use?

The biggest surprises are usually setbacks, lot coverage, parking, access, drainage, and utility capacity. In Monterey County and Pacific Grove, water, sewer, and septic issues can matter just as much as zoning, especially on older or tighter lots. A property may be technically eligible for an ADU but still face practical limits that affect size, cost, and timing.

How does an ADU affect value and resale?

An ADU can improve marketability, but it does not add value in a simple one-to-one way. Buyers tend to pay more attention to whether the unit is permitted, private, well designed, and easy to use, not just whether it exists. An ADU that feels awkward, lacks parking, or appears questionable on permits may add less value than owners expect.

What should buyers and sellers think about in a transaction?

Buyers should ask how the ADU was approved, whether it has separate meters, how it is currently used, and whether the layout works for their needs. Sellers should gather permits, plans, contractor records, and any city or county correspondence before listing. If the property is in Pacific Grove or nearby Monterey Peninsula neighborhoods, it is smart to confirm local rules early because these lots can have older infrastructure and unusual site constraints.