Actually it completely disables the build mode. At least that is what I have been told. I wouldn't know, myself.
Man, this game is a pain, just like I remembered the first one. I moved into Pleasantville or whatever, and met up with Brandi (these sims aren't random are they?). Had her fall in love with me, she moved in, left her 2 kids alone in her house... oh well. She got pregnant, before they had sex, she was throwing up and everything, big belly, before that even happened. But when the kid came, they just fell apart, my guy stopped going to work, they can't fix their own shower, bad diapers and bottles everywhere, kid crying nonstop.
Did I jump into it too fast or what? It's funny... I went to Brandi's old house with her 2 kids, and her teenage son took better care of his infant brother than Brandi did of her newborn baby. Do I just have to work up their skills before they go into parenthood and whatnot?
Even before she moved in my guy couldn't get on a schedule. He would come home, dead tired, and have to sleep just to be functional, by that time it is late at night. If I wanted him to do ANYTHING or talk to anyone, I have to get 100% sleep before work, come home, get a little sleep, then invite people over for 2 hours and go to bed. Maybe he gets so tired because of the military commando job? I don't know.
I did have some fun though, went to Brandi's old house and burned it down, killed the teenager but the baby unfortunately survived and child services took him to the orphanage

. I don't think Brandi knows.