How do you import houses onto sims 1?

Well you have to start the game then go to the family menu. You look and there will be a family with an arrow and you click on that. Then you will be able to choose which family you will be able to move. If you just want to move a single Sim and not a family you go into game play mode and when the newspaper comes you click on the newspaper and the menu will pop up. Then you click find own place and then you can move that Sim.

*note*- you will only be able to move a family or a single Sim if you have another house available