First, you need to build your entire house on the first(second) floor, not the ground floor! Then you drag the entire floor down, leaving a foundation height gap between the floor and the ground. This gaps you fill in with roofs, much like you would construct
basement windows. In this case, I also added some debug walls for their special structure and the opportunity to place it halfway a grid tile, providing me with the look I wanted. You can already obtain all information you need by downloading and taking the build apart. I also uploaded a
mock-up, just showing the basic technique
