Waterproofing the Shower – who pays?

Hi Guys,

NSW here. Just got an invoice to fix the waterproofing in the shower of a unit in our block of units. To me it seems like a mix of OC and Owner responsibility. Can you please advise.

Re-grout the walls of the shower recess – these are internal walls so owner?

Seal and waterproof junctions – wall junctions, owner?

Seal the floor waste – OC?

The shower screen within the shower will be sealed – owner?

Seal behind the taps – owner?

As I understand it, unless it is the floor or a boundary wall, these repairs are at the owners cost?

Thanks for your time.