If you need to convert the cellar or make it habitable you would need a waterproofing solution to ensure it is dry. Just post your job on Specialist Services in the category of cellar and basement conversion.
If you would like to ask a more specific question then I can answer more fully.
Peter Barber CSSW.,CRDS
Projects that add value to your home - Phil Spencer
Looking to extend your home but don't know where to start? Property expert and Rated People ambassador, Phil Spencer, shares some thoughts on why loft conversions are such a popular way to create more living space and add value to your home.