An unfinished or underused basement can become a comfortable apartment or private suite without expanding the home’s footprint. Depending on the space, the project may include insulation, windows, doors, flooring, walls, electrical, plumbing, heating and cooling, a kitchen and a bathroom.
A basement apartment is a separate dwelling, not a finished basement with a kitchen, so it comes with its own planning, permitting and code requirements. In a basement, that planning also covers ceiling height, moisture and access to mechanical equipment that serves the rest of the house.
For finished basements that stay part of the main home, see: