Yes, you can build your house in The Sims 3. However, building a house in The Sims 3 requires a certain amount of skill, especially for houses with multiple floors.
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An empty lot means that you have to build the house yourself.You can buy a house, though.You have to choose one. Sorry!
If you are talking about a gypsy caravan, it will only be avaliable in The Sims 3 Supernatural. However, if you just want a caravan-shaped house, you can build it. Note that you cannot build 'real' caravans - those that can move.
No you can buy a prebuilt house or move in some houses from the inventory thing in edit town.
First you build a foundation like your going to build a house but a very small one. LIttle foundation. Second: make the ground water then make it deep enough and to were the ground is even. 3. Then build a foundation under the water then stairs to the foundation up above 4. Then build it like a normal house, Your sims can go down there without dying, guarenteed!
Unfortunately, you can't actually build stairs/upstairs for the sims on ps2 :'( get the sims 3 or the sims 2 (computer version(s)) to do this. Both work on pc, but only sims 3 works on mac :)