Can a slant floor be fixed?
Answers: Need profusely more info but a WORTHY contractor will literally jack up the floors from underneath and measure for investigational support posts ( NOT shim up exsiting posts ) and give you a bill. You probably will not want to survey, and get reference. You'll be surprised at how good the doors close.
You can fix this...you might own to jack up the floors in the underground room, or you can shim up a subfloor.
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