Most properties are likely to have had some form of damp treatment carried out previously, however this may no longer be sufficient to meet our modern day standards and often alterations carried out during renovations will damage existing damp proof courses and / or remove previous waterproofing.
The addition of new driveways and patios etc often bridges old damp proof courses as ground levels are raised.
Many basements and cellars are now being upgraded into usable space where previously these rooms may have been coal stores or left empty.
If you are unsure whether or not your property has adequate damp proofing systems installed book a survey here.