Building regulations will be required if you are changing the use of the basement to habitable living space. This includes the means of escape, the thermal values, etc. If it is simply to be used for storage though, this may not be required.
Many things affect what is required for means of escape, for example does the basement exit onto a hallway which has a direct route to an exterior hall? Or does it exit into another room? Please contact us and we will be happy to visit and discuss your options.