conorm69
Your problem is most likely that either your supply or drainage pipes or both are wedged against some timber e.g floor boards,joist,wall batten.The clicking noise you hear is these pipes expanding and contracting against the timber with the hot and cold water.Unless you have easy access to the pipes it can be very difficult to remedy this problem,without causing a lot of destruction.But if you can live with that then dont be afraid to keep nagging the builder to fix this problem,because the longer you leave it the less likely he is to come back to you.Best of luck.
