How do you get a ground-level story to cover a basement in the Sims 2?

Answer 1

Basements, what fun!

The secret to it is that a basement cannot be covered by a floor unless the level is exactly one wall in height. That's the wall tool in the game. You can check your progress by using a wall inside of the area you dig.
Here's a picture tutorial
http://kitana.freesuperhost.com/cellar/cellar1.html

There are things you can do like a sunken living room which keeps tots from playing in the toilet, since youngsters can't do stairs yet. :)

You can get lots of basement ideas from the Official BBS on by searching for basements and restricting the search CATEGORY to How to/Tutorial.
http://thesims2.ea.com/exchange/search.php?searchPage=exch&search=1&asset_type=story&key=basement&order=UPDATE_DATE+desc&nrows=5&storyCat=How+To%2FTutorial&locality=&country=&view=new&x=9&y=9

Answer 2

I'm assuming your basement is already there and you want to build on to it? Either way if you have a house, and want to make a basement, or have a basement and want to make a house.

You just have to dig with the dig tool. there are suggestions on how to do this on the ea website.

Answer 3

i have tried this as well, i dug a big hole and ran into trouble getting the entrance to the house to work, i hope you figure this out. if yu do send me an e-mail