For the Bathroom – Vanity, toilet bowl, shower screen,
Can you do all that without moving tiles? Move the tiles and you probably affect the waterproofing. Mess with the waterproofing and you need a by-law.
Yes move tiles and waterproofing is needed with a registered design, new by-law and all that stuff.
But these 3 items are fixtures and generally sit on top of the tiles so should not affect the waterproofing. They are also the responsibility of the owner and don’t need OC approval to change.