Wrong measurements either by accident or on purpose, like missing laundry rooms, and walk-in closets, or adding in areas like open stairwells, exterior patios, decks, and porches are a whole lot of ugly. Misrepresenting the size of a house just to increase price based on square footage is a fraud, but marketing a home using inaccurate data can get you, the buyer, and the seller involved in a lengthy and pricey lawsuit. As a Real Estate Professional you owe fiduciary duties to the consumer that include providing accurate square footage for every listing.
You can not assume every piece of the floor plan is living space. Can you really include both bay and bow windows, dormer windows, and crawl spaces in the square footage? These areas are difficult to measure and should not always be added to the total size of a home. Ceiling height is an important factor when it comes to useable living space. Having a precise floor plan can show you whether or not you should actually consider the attic in the total square footage.
How do you calculate accurate square footage? Do you measure around the exterior perimeter of a home or the interior? A condo plan represents size using the exterior method of measurement when, in fact, the actual living space is measured from the interior walls, a substantial difference in square footage. When there are so many questions surrounding the square footage calculations, you need to hit the mark every time.