I'm planning to convert the basement in my house into a couple of bedrooms and was all lined up to have it tanked out with a waterproof cavity lining and sump/pump system but have just had it pointed out to me that it isn't actually particularly damp in the basement so dry lining and additional ventilation may be sufficient.
Of the walls that I intended to line only one of them is an external wall which does show signs of damp but not excessive, there is also window on this wall which is currently boarded up allowing some water penetration which accounts for some of the damp. The room concerned is an old victorian kictchen.
Obviously it is a risk but it would save around Â£10k on the project. Has any one had any experience of this or any explanation to me as to why I shouldn't take this line. Also how would it effect me for building regs and when I come to sell it