Adding space to your existing home can take several forms. Depending on the contractor or where you are, some of these terms can be interchangeable:
3 Season Room or Sun Room – Most often, this means covering up a patio or deck to create a comfortable, protected living area that can extend the seasons for enjoyment.
Build-Out or Extension – Also often called an addition, this refers to building out horizontally, increasing the footprint of the home. It usually means building the main floor out onto the backyard. Sometimes the foundation is extended as well to increase the basement square footage. Extra living rooms, a new kitchen or bedroom are all common home extensions that can add immense functionality to the home. Skylights or cathedral ceilings can often be accommodated.