Without having read that Act, I would guess that it has provisions for giving notice (perhaps more than 14 days), reasonable compensation for inconvenience and so on. You might want to check that the OC is sufficiently indemnified by the builder for any injury that might occur on common property. I would be notifying your insurer about this activity which might occur on your common property and check what they would want you to extract from the builder in order to keep you covered.