Hi im a Builder in sheffield
BCB Tiling And General Building Works
I would Recomend getting a specialist to check it out the guy we use is called Chris
He will give you the best advice possible and will give you a detailed Quote if it does need damp proofing doing his company name is
New Dawn Services you can contact him on 0114 286 2627
He can also sign off any work he does to mortgage requirements
Good Luck
Bill