The key to this question is whether or not the current balcony balustrades are safe (and I don’t mean compliant with current standards – that’s a whole other issue). If they are still OK but unsightly, then this is an improvement. If they are unsafe, then this is an owners corp responsibility. Having said that, let’s not forget who the Owners Corp are – you guys! This is not a freebie.
However, what really baffles me about this is the potential for scattered appearance with some balconies filled in and some others not. It’s like the building will be pixillated. And who will have responsibility for the maintenance and repairs of these enclosed balconies?
I think your Owners Corp should step away from this half-baked plan and let those who want to enclose or upgrade their balconies do so at their own expense and with by-laws to ensure they will have responsibility for their ongoing maintenance.
But I wonder if perhaps someone on your EC is pushing this plan because they will get what they want out of it.