Aaaah, Queensland body corporate regs, confusing one day, bewildering the next.
Have a look at this fact sheet:
Basically the committee can agree to common property improvements costing up to $200 per lot, unless that limit has been raised by the body corporate at a general meeting, to a cap of $300 per lot.
Above those figures, anything up to $2000 per lot can be approved by a simple majority at a general meeting and anything above $2000 per lot requires a special resolution at a general meeting.
An owner who disagrees can apply for dispute resolution.