In NSW, can’t owners choose the surface treatment of the lot interior side of common property walls? If you can paint, wallpaper and attach fittings etc to the wall, why can’t you tile it? If you can, then I suppose this issue is about the removal/replacement of the existing tiles, because they were an OC responsibility?
Wouldn’t permission from the OC before doing the tiling generally be enough? Where the OC could specify the quality of the work etc. I.e getting permission from the OC to repair/replace some common property. If the work was done to the standards specified by the OC, shouldn’t that be enough for the OC?
Since the work was been done without OC permission, wouldn’t inspection of the work or some documentation of the work quality be enough for the OC?