The first step you should take before deciding what kind of construction you want is to talk to the specialists. They are professionals and they can help you with ideas and advice. If you have something in mind and you explain it to the duplex home builders, they will develop a project in order to see if it can become real. On the other hand, there is no need to have something in mind when you go talk to them, but you can simply ask them for suggestions and they will be more than happy to help you.