Does anyone know the best way to model the inside of a house? I want to model the whole interior of a house and then allow someone to walk through it using the camera. I’ve never done something like this before so I would like to know the best way I can model the interior so that I can use it in the game engine to walk around in. This is for an art project at college so all help would be greatly appreciated 
I’d probably start by putting in the floor plan in geometry for the base plane that one would use to start the house. (ie. Polygons where the walls will be extruded up later). Then extrude the walls. For second floors one would do the same thing only have a whole in the floor for stairs.