An addition is an improvement that increases the square footage of a structures. These include lateral additions added to the side or rear of a structure, vertical additions added on top of a structure and enclosures added underneath a structure.

A custom home is a one-of-a-kind house that is designed for a specific client and for a particular location. The custom home builder may use plans created by an architect or by a home designer. Custom homes provide consumers with the opportunity to control layout, lot size, and accessibility.