Do you have more info? Is this a new purchase?
Nope. Its a fairly old structure. I would say 30 years+
Was there a List Of Defects supplied etc?
No list of defects supplied. The previous owners were an old couple only 2 of them staying there. I assume they never used the guest bathroom upstairs. It looks like it was renovated recently but it looks like a 60 year old designed it. Tiles look new, all the grout in the walls look fresh, no stains etc. Toilet and basin still had stickers on it when I moved in.
The site where it's leaking, what does this look like?
In the shower upstairs, there's no visible signs of leaking. I'm guessing its the drain that isn't sealed properly, or maybe a joint in the pipes.
Downstairs, the ceiling paint was a bit bumpy/flaky (not sure know to describe it, Ill take a pic and post it later) but there was no wet spots or mold on the ceiling when I moved in. It wasn't the best condition but wasn't the worst such that it needed immediate attention . There's still no mold, but the leak from the previous night left a few wet spots but I took a mop and wiped it off.
I spoke to my neighbour, they also had that problem before. They said it was their shower drain that was leaking and they fixed the leak and that was the end of it for them.
I can get my leak fixed, but that doesnt fix the issue of the slab leaking. Im quite sure it not meant to have gaps to allow water to leak downstairs. If there is a leak, the water should stay upstairs
Post a pic of the shower base. If its plastic, rip it out, and build it up.... and do plumbing correctly
Will do when I get home. The shower base is brick and tile. Still going to rip it and redo it.