The first thing I would do would be to find out what their objections are and then try to address them while still going ahead with the project. Mediation might be very useful in this regard.
If their objections are simply that they don’t want to be part of it, for whatever reason – cost, hassle, agreed design – then there are processes through NCAT than can lead to orders which they must eventually abide by or face serious consequences.
However, the simple facts are that in the vast majority of cases, the owners corp owns the balcony and has responsibility for its maintenance. Explaining that and the consequences of fighting a battle they are very likely to lose might get them over the line.
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