By properly tanking the basement it effectively becomes a fully useable room of your house.

Cementitious Waterproofing Slurries
This method if installing basement waterproofing involves adding a thin layer of waterproof cement to the floor, walls and ceiling of the basement. The solution is mixed with water and can then be applied either by spray or trowel. It will bond with the masonry substrate which will set to create a completely waterproof layer that will last for a long time.

Studded Membranes
These types of basement waterproofing are ideal for older buildings whereby the underlying substrate is not as reliable or could become unstable. The waterproof membrane is attached to the walls with special sealed fixing plugs. There is normally no need to install the membrane on the floor. There are differnet membranes you can look into, Permaseal membranes, Newton Membranes, Delta Membranes.

The best solution
Often the best solution to create a completely waterproof basement is to use a combination of different membranes. For example the cementitious waterproofing slurries could be applied to the walls and floors whilst the studded membranes would be added to the ceiling where it's not as practical to apply the cement mixture.

If you have any doubts consult an expert.