I agree with Jimmy-T but point out:
It won’t be s.49 (Cost of repairs, maintenance or other works) of the OC Act that applies because that section is about cost recovery when the OC has already paid for the works.
It will be s.24 (Extraordinary fees) that will apply. That’s when an OC raises special levies. But the “benefit principle” still applies in s.24.
Also, if the works are being done and funded over time in stages, with all lot windows either planned to be replaced or have already been replaced, it’s likely that the “benefit principle” won’t apply at all.