When we relocated to San Diego nearly 17 years ago, most home garage renovations were illegal—meaning they had been done without proper permits, if any. The stated interior size revealed all: A 600-square-foot cottage would be obviously larger, because of the undocumented, unsanctioned expansion.
Oh, and the buyer inherited any liability. Imagine one consequence, where the city, county, or state issued fines or demanded the whole, ah, illegal project be torn out. For the short time my wife and I considered buying a home here, we stayed clear of such properties.