If you haven’t checked out my website in a while (specifically http://marylandhomes.pro/resources/community-reports/ ), we are always making improvements to it. This is one of the latest additions. You outline the roof of your home, from satellite pictures, and it calculates the square footage of your home. Of course, you need to mark it carefully and still multiply by the number of floors, but it is indeed incredible that these tools exist. Check out this and even more useful tools like : Family Watchdog, SpotCrime, School Reports, Surveys and much more.