The key to this is waterproofing,
If you are changing the floor tiles, or tiles on walls that are shared with adjoining flats or common property, you should have a special resolution by-law to shift responsibility for the waterproofing from the owners corp to you..
It is too late to have anything added to your AGM agenda, so (if you need it) I hope you have a standard by-law that allows you to agree to the conditions of a by-law subject to its approval at the next AGM.
Otherwise, you could put something in writing that can be agreed at the next general meeting.
But if you aren’t re-tiling the floors or common walls, you should be OK.