If you want to have one of most beautiful house, let the cheats to help you. There are some tricks, which you can do it only with using this kind of codes :
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bb.moveojects - it lets to ignor placement rules and combine objects.
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bb.ignoregameplayunlocksentitlement - unlock all career rewards (including styled rooms)
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Shift + ] - increase the size of objects in game
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Shift + [ - decrease the size of objets which was enlarged
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bb.showhiddenobjects - buy Debug mode (adds extra objects)
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bb.enablefreebuild - edit the hospital, science lab, secret lots or police station.
All this code you have to write in hide window. Its opens by pressing CTRL+SHIFT+C
From now all your buildings depends of your creativity. Good luck!