There are many things that can expand the flexibility of a home. But the one thing that can really make a difference is a guest suite. This one feature can truly transform the usefulness of a home.
While it is possible to convert a home office or study into an extra bedroom. But its not as useful as a bedroom with its own bathroom. A guest suite is a lot like a in-law suite.
If you are looking for a house plans that has a lot of potential for family grows. Or one that will easily be converted into a multi-generational home. Then you should be looking for a plan with a guest suite.