With our Favorites System, you can virtually build your home right here online. Choose your favorite floor plans, colors & finishes and save them directly to your account. So go ahead, play favorites. Residential Builders, located in North Anne Arundel County Maryland, was founded in 2005 by Paul Nalley Sr. and Thomas Diggs. After seeing the quality and flexibility in design of the modular home industry, we were motivated to launch Residential Builders LLC. It is truly our desire to create custom home designs that will meet all your needs and build a quality product that will satisfy you and your family for generations to come.