Good return Whale but my problem is with
Well, the answer at my Plan is a really diligent Executive Committee, (hopefully) honest Proprietors who own-up if they’re the ones who made the alterations/ changes, and a Special By-Law supported by a Register of Common Property Additions /Changes stating that any additions / changes that are not shown on the Register are unauthorised under S65A, and that maintenance and repairs of those are the responsibility of the present and subsequent Proprietor/s of the Lot/s concerned.
The honest owners aren’t the problem because when situation is explained to them they will do the right thing. It’s the blodgers I’ve a problem with that will exploit the situation for all it’s worth and lie and cheat to obtain a result for themselves (I know because we have one).
Also the number of strata that have a special bylaw as you sugested would be less than 1% (I suspect) and even if they did manageing this register would be a nightmare IMHO and so only possible in a really well run Strata (which 90% are not)