Claude seems correct on this:
"The American National Standards Institute (ANSI) provides guidelines for measuring and defining finished areas in residential properties, primarily used to determine Gross Living Area (GLA). According to ANSI standards, a finished area is typically defined by certain characteristics that contribute to the livability and comfort of the space.
ANSI Guidelines for Finished Areas:
- Finished Ceiling: The area must have a finished ceiling, with coverings like drywall, plaster, or ceiling tiles.
- Finished Walls: The walls should be finished with materials such as drywall, plaster, or paneling.
- Conditioned Space: The area must be heated and cooled by the home's primary HVAC system.
- Lighting: Adequate lighting must be provided.
- Flooring: The area should have a finished floor surface, which is where the question of concrete floors comes in.
Concrete Floors in Finished Areas:
- Standard Requirements: ANSI does not explicitly prohibit concrete floors in finished areas as long as the floor is covered and contributes to the overall livability and comfort of the space.
- Finished Floor Coverings: A concrete floor can be considered part of a finished area if it is properly covered with a finished surface such as carpet, tile, laminate, hardwood, or any other flooring material that enhances comfort and aesthetics.
Conclusion:
Yes, a finished area by ANSI definition can have a concrete floor,
provided the concrete floor is covered with a finished surface. The finished surface must contribute to the overall livability and comfort of the space, aligning with ANSI's guidelines for what constitutes a finished area.
Bare concrete floors would typically not be considered finished under ANSI standards, but once covered appropriately, they can meet the criteria for a finished living space."