In this tutorial, I'll show you how to quickly turn a floor plan image into a 3D model in Cinema 4D. If you want to model along, you'll find the floor plan image at commons.wikimedia.org/wiki/Fi...
Edge extrusion seems completely busted for me. Every time I tried, it angles go off in a weird place, (I set all values to 0). I don't know what else other to give up and bevel polygons.