Here's how to improvisationally piece a house. No templates, no stress.
Cut a couple different widths of your house material (I've got way more than that cut, but you don't have to) with the max width approximately 1.5". These don't need to be long strips.
Next cut out a rectangle for a door and a square for a window.
Sew some house fabric to the side of the door and above the window.
This is a quicky roof. Lay the bottom of the house on top of the roof fabric, leaving a corner of the roof sticking out. You want about an inch of roofing on either side of the house. Slice the roof triangle off.
The next step is to cut out a rectangle of sky fabric. It needs to stick out about an inch farther on either side from the edges of the house block. And it needs to be a couple of inches higher than the peak of the roof.
Then sew the chimney section of sky onto the roof section. Trim even. This is terrible to admit, but I got so carried away with sewing, that I forgot to take a picture of the roof with both sides of the sky added. D'oh. Anyway, you can figure that part out.
Sew the sky section onto the bottom house section, trim it up, and you should have something along the line of this:
One of my favorite ways to build a house is to take a look at a house block that I like and try to follow the blueprint. My house never looks the same as the original, but it gives me a direction to go in. I've got loads of examples of house blocks in both my blog and my pages on Quiltville. Take a look.