Claudia is right. Once a modular home is planted on its foundation, it has the same designation as a a site built home. It's called real estate and lenders view it as such.
Sometimes modular is confused with mobile and the two are as different as night and day. Mobile rolls to the site on wheels attached to a chassis and can easily be moved from place to place. A Modular home CAN be moved but it is anchored to a permanent foundation. A modular home, built in a factory to the Universal Building Code and to local codes as well, is highly engineered and depending on the factory, can be better constructed than even a site built home.
A mobile home is built to lesser codes an can use 2"x3" walls for instance, something you would never see in a modular OR site built home.
I have extensive experience in both site built and modular construction if you ever have any questions.