I would love to comment further but im not sure what and where the balcony you are talking about

For a terrace house, you have to leave 20ft infront from boundary line there with no wall. You can extend the roof leaving maximum 10ft from boundary line to edge of roof.

For CF and CCC, basically once you renovate the house, you will get a new CCC to replace the old CF. If you have an Architect as mentioned there, he will know to apply for the new CCC upon completion. If he is a runner/just a drafter, he wouldnt know and avoid to do CCC because he does not have the qualification to do it.