Drag doors from the Directory onto walls.
Choose New> Building Wizard and use default sizes to make a house like this. In the Directory, click Building Materials> Doors> Entry.
Drag door below onto wall:
Right-click door, choose "Reverse Object Direction" or "Face Other Side":
Right-click door, choose "Set Dimension."
Choose Build> Draw Doors (custom) to create doors arched tops and other shapes. See example below: