Building Control - What happens if I do work without obtaining approval?

Carrying out work without obtaining approval, or work that does not comply, may lead to a criminal conviction. This can lead to a fine not exceeding £5000 plus a £50 per day continuing fine following conviction. You will also be made to take down or alter the work.

Both the owner and the builder have a responsibility to make sure that a Building Regulation application is made before work starts and that notification of the various stages of work is given.