If your homes / plans / designs / projects contain only levels, walls, rooms, dimensions and texts, there's no problem to sell them or redistribute them. But I guess you added at least a few doors, windows, staircases and other kinds of furniture, right? In that case, you should take care of the license of the 3D models of each object you added. For example, the models coming from ArchiBit are distributed under Creative Commons BY-NC-SA license which forbids you to use them for commercial purposes.