Manufactured homes are HUD code manufactured homes with HUD labels mounted to the exterior (usually on the ends). Modular homes come in many varieties (UBC, etc) and are typically not set up on the same type of frame or set up as a HUD code manufactured home (some are delivered on a flat bed and set up on a foundation with a crane, etc). They have a label typically inside the home, but not always. We have very few modular homes in this area, but they can be compared to site built homes. What you need to watch out for is on frame modular homes. These go down the same line as a HUD manufactured home and are delivered and set up the same way. Fannie and Freddie will not loan on on-frame modular homes and they are not to be compared to site built homes. They are most similar to HUD manufactured homes, but have fewer financing options. What I have seen is lenders ordering and appraisal on a on-frame modular home and sending documentation that modular homes should be compared to site built homes, which on-frame modular homes should not, but the lender does not care if you get it wrong.