because the water could seep through the joints between the new tiles and sit between the two layers and affect the seal and also raise the height of the floor and affect the slope to the waste outlets..but, why do you want to retile if you're not using the bathroom??...for immediate resale consider bathroom wall to wall bathroom carpet, new wall paint, new vanity, taps and light fittings which should also be cheaper than tiling over the top and, if it's not allowed by the body corporate, it will be a risk to future sales as it should not satisfy a proper building inspection

Have you priced having the whole lot re waterproofed and tiled? You are already doing the hardest section, it may not be that much more to do the lot. Otherwise agree with above match to the white tiles in the rest of the bathroom. But it will always look like a repair.

Hi there. I am looking for tiles to renovate my bathroom on very tight budget. Can you send me some photos with the size and how much are you after please? Thank you

Yes I have by Precious Tiling. For my home, we first did the concrete flooring then laid the vinyl tiles. For a quality job, the substrate must be clean, flat, and very smooth. To fit tile around pipes or obstacles, cut a pattern from cardboard and then use a contour gauge or compass to transfer the pattern onto a tile.