Illegal Object! House not legal, not committing!

[Ownagizer Bunny]

Im getting this message when trying to finalize a custom job to my plot..... Anyone got any ideas?

 

[Mango]

If a piece of floor/wall/roofing defies the laws of gravity it'll appear orange, and prevent you from committing.

 

[Nanashi]

Look on every house level and make sure you don't see any red spots. Sometimes when you are placing walls and such, you might forget to delete them later. Another error would be because there isn't any support for the level above or a floor tile missing.

 

[Guttersnipe]

Usual culprits are unsupported roof tiles and then floor and walls placed above stairwells. Go floor by floor invising your walls. Sometimes they block your view of bad floor tiles.