Thanks everyone, I think we'll build a new fence, seems like the best solution for a seamless look.

Thank you for your comment. Do you mean that we could build a new frame in front of the existing fence but 2.2m high, and fix the horizontal boards to ...

Thank you very much for your reply. The pool hasn't been installed yet, I'm asking preemptively as I know the current fence won't comply with pool fen ...