With a lot of work. There isn't a built-in way to implement something so complicated and specific.
You have 3 main elements here:
1. The shop itself
2. The 'outside' scene
3. The house to be placed
Before you can worry about element 3 have you designed elements 1 and 2? If not, get to work on those first. If so then can you perhaps give us some more details so we know what we are working with?
Placing a house is just a matter of generating a node and placing it in the current scene which, if you have done those other elements, you should generally have the knowledge to do this.
If you have more info or a more refined question then we may be able to help more.