First ask if you can check the shower unit with your neighbour, look for any defective mastic around the shower base or anywhere water can leak through. If all seems good , use a stain block on the stains and repaint. It does sound to me that theres a leak in the shower, hope this helps.

hello. Like is fixed, but moisture can still "seat" in the walls and ceiling especially if there is some insulation between you and neighbours level.
Solution for some time is to get humidifier to take wet from the room and paint area with the stain block paint.
Proper solution is to take off plasterboards/plaster/render whatever and fix new surface. You can bull your neighbour if thats never happened before.
Try to charge it from his insurance.

Best Regards and good luck

The reason that you have stain on wall and ceiling is that the water left a iron residuw and when painted with water baced paint the stain reapears . If you put two coats of varnish over the stains leaving 24hrs betwean coats.Let it dry for 24hrs then repaint that should stop stain reapearing.

If your sure that the leak has been resolved, whoever did the decorating did they use a stain block before painting, as you can put as many coats of emulsion on as you like but the water stain will keep coming through.
Treat the areas, and beyond with stain block or oil based paint, couple of coats, when its all dry emulsion over.

Hello if the leak has been fixed and dried out then the ceiling needs to be painted with 1 or 2 coats of stain block first to prevent the water stain from bleeding through the finished surface.You can then put a couple of coats of a good quality paint suitable for bathrooms on top of this .You can post a job on this website to get some quotes for the work you require from local decorators.Hope this helps,Thanks Justin

I would tell your neighbour and ask him/her to have the pipe work looked at just to be safe.Three months on and all of a sudden you have brown stains on the wall and ceiling sounds a bit strange,unless the decorator just emulsioned over the stains and theyre still bleeding through!
Was the whole area re_boarded or just re-painted?

Good luck.

Hi,
Try a few coats of oil based undercoat on the stains and then repaint the ceiling and wall in emulsion. Usually does the trick.

Either use a Stain Block from any DIY store,or Gloss the stain,undercoat the Gloss and emulsion as you would...Richard