It's ok you're not the only one. Mine is the same way...

I know what you mean. maybe you can either create another file or just put LOADS of smoke
alarms in your other house, like 3 on each floor. just try it and see what happens. gud
luk hope ive helped and it all goes well =D xxx

Actually, no. Most times it won't let you buy anything if that happens. Why dont you try
doing the catfish cheat at the beginning of the game when you start, THEN put lots of
smoke alarms down?

That does not work so why the hell would put a house that you can not *** use?

Well mine does that too sometimes but then the hpuse should appear and the space will
become empty again and you can place stuff then. If that doesn't work then just come out
of build mode and go back in. The house should be there alone and you can build then.