Step 1: The First Side
Step 2: Duplicate the Side
Now press the quad arrow button at the top of the screen to manipulate the new layer.
Press the move layer button and follow the on-screen instructions to move the image next to the one below it.
Once you are satisfied with the position press the Done button.
Finally merge the layers by selecting the layer tool and pressing the Merge button.
Step 3: The Roofline
Now using box and/or line mode draw some tabs on the main body of the house. These will be used later for gluing the house and roof together.
Step 4: The Fence
Starting from one side draw a box past the middle of the screen. This will form the basis of the fence.
Next draw a small box on the outer end of the "fence" to form the gate. Don't worry, it'll make sense soon.
Switch the drawing mode to freehand for this next step (stay in mirror mode). Form a small curve inside the "gate" block from the top of the "fence" to the outer edge.
Now switch the drawing mode to line mode, and fill in lines to form the bars of the gate and fence. They don't need to be perfect. Draw some of the lines to tilt and lean.