Do damp proofers carry out tanking of basements?

Yes it’s the correct way to waterproof a basement to tank with membrane etc.

As in the previous answer, you will need to use a cavity drain membrane system. This is a job a Damp proofing contractor will carry out. A CSSW qualification isn't essential though. An experienced company will be able to carry out this job to a high standard and still provide an insured backed guarantee.

You really require the aid of a CSSW qualified surveyor to assess and make recommendations. We see too many failures of basements where un skilled individuals/ companies put forward incorrect specifications and carry out poor installations . A good contractor will not only have the qualifications but offer insurance backed warranty

As long as the person is competent and has history of under ground basement conversions. Always check out past history.of works qualifications and Backed Guarantees.

Yes full waterproof tanking system ,sand & cement o.p.c 4x coat render