Our Owners Corporation failed to put to General Meetings a Motion seeking approval to renovate my bathroom. Instead, they quoted $7,000.00 just to organise the paperwork to conduct an Extraordinary General Meeting. After 17-months of this I discovered that there is a system whereby one can renovate without altering any of the common property – hence, no need for a by-law. Very pleasing results and it took 7 days from go to woah with really minimum mess. There was no need to remove tiles etc.
You could also look at: https://www.wetareasolutions.com.au
Their Spapanel solution absolutely did the trick.
Good luck.