Bonus Space House Plans:If you need more room than your building budget currently allows, a house plan with bonus space might be just the ticket. Bonus rooms, for example, are often located above a home's main floor, and are left unfinished at first. This allows the family to finish off the main floor and live comfortably there for years. When their finances have stabilized and the need arises, they can finish the bonus space however they please. Some house plans even design an entire upper floor as unfinished bonus space! Customers use this to their advantage by leaving it unfinished at first—and then practically doubling their living space a few years later.