Step 1: Take a box and stretch it as shown.
Step 2: Drag another box and place as shown below.
Step 3: Drag a roof shape and align it at the top of second box.
Step 4: Drag round roof from the shapes.
Step 5: Align this at the top of other box.
Step 6: Grab another hole box and change its dimensions to make a door.
Step 7: Align it as shown below.
Step 8: Similarly, create windows on the other side of box.
Step 9: Finally group all the shapes together.
The result is:
So, our strategy here is to combine many basic shapes to create a more complex outline.
Similarly, you can go for many complex shapes.