Hi Jimmy,
Much appreciated your advice! They are very helpful!
You are absolutely right that the strata committee should be involved as their are 3 balconies joint together and if any works were to be carried out it will affect all 3 balconies. I will also ask the strata to see if other units in the buildings, especially the unit below the 3 balconies, have water egress issues in their ceilings.
I will be meeting with the builder tomorrow to make a claim and take it from there. Thank you again for your advice!