We're not talking about the old one-use-only rooms, like home theaters or indoor swimming pools, but modern spaces like exercise rooms and workshops. Another key difference: these rooms are designed for maximum flexibility, letting them shift function on a dime.

Workshops on Both Levels + Flexible Den

This striking Craftsman home offers up a truly impressive amount of storage space and other useful amenities, including workshops on both levels (main and lower). A game room, guest suite, wet bar, and more storage add fun and functionality to the finished walkout basement. On the main level, the master suite surrounds owners with luxury, including a deluxe bathroom, walk-in closet, and sliding doors to the deck. The second bedroom sits close enough to the den to use it as a semi-private living space if desired (perhaps for an elderly parent). The rear deck provides indoor/outdoor living to the great room and dining area. See more images, information, and the floor plan.

Exercise Room/Home Office with the Right Amenities

Cupolas, curves, and an eyebrow dormer give storybook whimsy to this head-turning plan. Coffered ceilings top the dining room and great room, which are separated by an expansive open kitchen. The unique office/exercise room steps out to the screen porch (complete with a summer kitchen and fireplace), making it easy to get fresh air. An adjacent bathroom is perfectly situated for a post-workout shower. On the opposite side, the master suite enjoys porch access, two walk-in closets, and a deluxe bath with a large shower and two sinks. Two more bedrooms share a Jack and Jill bathroom near the front. See more images, information, and the floor plan.