We have a sunroom directly connected to the back of our house. It was a 350 square-foot addition that the prior owner added. It is fully enclosed with siding to match the rest of the house, windows, and a sliding glass door to the back yeard. It has a ceramic tile floor and a hot tub. It is heated with a gas heater/fireplace/stove. This square footage was included in the total finished living area (TFLA) when the house was purchased 5 years ago. We had a real esate agent list the house a year ago, and it was included on that listing as well. However, we had a recent appraisal done, and this square footage was specifically excluded thoughout the appraisal including the real estate comp analysis. Are there rules related to what is required for a room to be included in the square footage of the house in an appraisal?