What would cause this cracking?!

[Justworkplease]

Have just had a full bathroom fitted in the room next door to this. It’s a shower/bath that fits perfectly wall-wall and is all tiled in. This has appeared the following day after the bath has been used for the first time.

Its a tiny bathroom, the bath runs the full length of the other side of that wall. Where the big crack has appeared is right in the middle of the bath 😓

Would the bath be attached to the wall?! Or does it sit on free-standing supports on the floor?

The bath sits on the floor, though often on large chipboard squares to distribute the weight a bit. That crack, and the one to the right with the nail protruding, are joints in the plasterboard.
I’d guess that the weight of the full bath of water has either bowed the floor or (somehow) the bath has bowed and pushed against the wall, however they are designed not to splay out, so maybe unlikely.
What’s the ceiling like downstairs? Was the floor reinforced for the weight of the bath? How old is the house? Is that a new partition wall and off so is it very narrow?

@C4tastrophe Thanks for replying. I have no idea about these things and it’s a property that we’ve just moved in to.

Its a bungalow so bathroom is on the ground floor. The house is about 45 years old. It’s an original wall, not a new partition or anything.

We had bathroom fitters come in and do the work while we were away for a week so I have no idea what’s been done underneath the bath. Thinking about it, I wasn’t in that bedroom at all between the work being done and the bath being used so the crack could have been caused by them working on that wall rather than the bath being used?

There was a shower cubicle removed which would have fixed to the wall right on the other side of where that big crack is too. Could it have been caused by them using too much force to remove that?

They’re coming today to do a few final finishes so would like to have half a clue what I was talking about when they come back!

Its not clear from your pictures where the cracks are? Is it in the bathroom or below? Wall or ceiling? Makes a difference. Could be that the rafters aren’t strong enough for the weight of the bath. Could just be plasterboard settling. Depends where the cracks are.

Sorry just seen your update that it’s not the room below so where are the cracks?

@PeekabooAtTheZoo Sorry, it made sense in my head 🙈

Its the room next door to the bathroom so it’s on the other side of the wall from where the bath is

The banging to loosen the tile on the other side for the refit has loosened the plasterboard. You can have it nailed and reskimmed next time you decorate. It's nothing to worry about.

@ODFOx Typically for us, the bathroom was the last job being done 🤣 was meant to be the first but the job was delayed so we’ve moved in about 8 weeks ago and redecorated every other room first 🙈
Glad to hear it’s likely just annoying having to get it skimmed and decorated again rather than being any kind of issue thought 👍🏻

You’re probably right.