Before I start modeling my house, I'm going to take a moment and reflect on my plan. You are not limited to just the images you imported into Blender. You can refer to images outside Blender as well as your own memory and recollection. Looking at another image, I notice that the room to the right of the house is actually inset a bit from the main structure:
There are many ways to attack this shape. I'm going to start with the cube we used for scaling the empty earlier. I'm going scale it down to the length, height, and depth of the main structure. Then I'll raise ...