Most states require at least 2 quotes for any single contract above a dollar threshold (commonly $30,000 in NSW). Best practice is 3 quotes for any significant works regardless, so the committee can demonstrate value and proper process.
Quotes should be apples-to-apples — same scope, same materials, same warranty. Cheap quotes that exclude essential items often end up the most expensive once variations come in. The strata manager should help write a clear scope of work before going to market.
Compare written fee proposals from strata managers covering your building — free for owners corporations, no obligation.