1- Now start adding the walls around it. It is comprised of 3 cubes and 4 triangles (ramps). Place 2 cubes beside the doorway, off of the base, extend them to just beyond the base so you have a width between where the base ends and where the wall ends equal to that of the width of the wall you just made.
2- Add 2 triangles (ramps) on-top of that. The hypotenuse or the sloped side of the triangle is going to be the angle that the roof slopes. A good angle to use is a 45 degree angle.
3- Next add a cube in-between the two triangles and extending about them. There is not specific height to use but use my numbers as an estimate.
4- Add 2 more triangles on-top of the cube you just created. Make sure to leave space between them, this is where the window will eventually go. Again a 45 degree angel is good.