Well septic plays a big part if you have your own septic systems and not a public. It also goes on the amount of people living in the house and using the system. A bedroom should have its own door for entry and exit and also a closet.

What is a bedroom? For septic system purposes, the design has allows for 150 gallons per day of effluent per bedroom. However, the structure may not have that many bedrooms in fact. One might also rely upon the town's tax card as another source, but who knows what an assessor used. Regardless of the waste disposal system for the home, I feel that the most reliable definition is a room with a door, a closet (or place to easily provide one) and a separate means of egress (e.g. a window that someone could escape through in the event of a fire). The fire department has a precise definition of this size, but I would simply point out that a basement type window probably does not qualify unless it is a sufficently large double hung window. Vacation cottages and camps may have somewhat sketchier definitions and I have seen sleeping closets that I would not call a bedroom. As far as the MLS is concerned, you will find a range of interpretations as to how properties are listed.

Normally the room should be above ground unless in a split entry, it should have a closet and its own door so that you dont have to walk through one room to get to another and if you have a septic the septic is based on bedrooms. so it is possible to have a 3br septic design and only 2 bedrooms were built but it would be less ok if you had 4 bedrooms and a 3br septic design. if you have city sewer than of course the septic size doesnt have an affect. Where as you are replacing your leach field it also goes by how many people live in the house. a 2 br design is really for 3 people where a 3 br would be for 4/5 people. The size of your leach field will affect your future value. So trying to skimp now may hurt you later. The person doing the septic design should be able to tell you exactly what you need and assist you with it. Good luck with you project.