Take an origami sheet.
Fold the paper in half, then in half again in the opposite direction.
Fold the paper in half, crease well and open. Do the same for the other side.
Now, fold the outer edges into the center line. Crease well.
Fold the top edge down to the center line and open out again.
Take the inside flap and fold down along the crease to the outside edge and flatten.
Repeat on the other side, and flatten.
Turn the model over and fold the bottom edge up to the bottom of the roof. Again, turn the model over.
Make the door of the house.
Your house is ready.