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This is possible, but it isn't supposed to be. First, use the terrain tools to make a square hole where you want the basement to be. Make sure to measure it somehow, so that it's the perfect size. Then, use the flattern terrian tool and drag from the middl of the basement to each of the four corners. Now build the floor. Just to let you know, the walls don't work so if you want a basement you can only have a basement and nothing else. Try experimenting to see what works for you. Hope I helped!

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11y ago
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Q: How do you make a basement on sims 3?
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