We hope to enclose this brick fireplace with a new wood/stone mantle and change out the old tile hearth. Also need to sand the floors. As you an see from the photos, the hearth pitches downward from the fireplace; and the floor pitches downward toward the fireplace; the low point being around where the hearth ends. It's a 1924 house so some sagging is expected. However I'm concerned there might be structural issues--you can see the flooring crack on the side of the fireplace. I'm assuming we should do floor repairs before we cap the fireplace and floor sand. I doubt this sag can be corrected without a huge expense, nor may it be necessary, but I'd like to get some in put from you all. I was told that a previous owner oversanded the current floors; we may choose to do a buffing instead of re-sanding as they're generally in good shape and to keep the orange cast.