If, the floor does not feel solid. Have the structure inspected for rot and damages.

Is the layout original? If, there had been a renovation in the past. It is possible to find uneven floors in areas of the rooms.

The floor feel solid & I think it is original. Thank you.

Unevenness is always a concern that must be explored and remedied, before any new floor goes in. Industry standard 3/16” in 10’ flatness must be achieved.

Thank you.