Need more living space? room addition drawings Consider building a room addition. We offer a variety of room addition plans that allow you to expand your living space by adding on to your existing home. Whether you need more room for a home office, a cozy den to watch TV with the kids, or guest/in-law quarters, a room addition plan can deliver the extra space you need while enhancing livability, functionality and the value of your home. For other options, please view our Sun Room plans, Screened Porches, Deck plans and Miscellaneous Accessory Structures.