Rafal Kaczynski
Dear Amir If mould appear very close to a window it meansthat is not enought air draft around it so please try to find competetant trade to help you with an issue. For an ensuite and bathroom I would recomend to fit an extractor fan to help with an air circulation in a room There might be an issue with an outside walls as well so would recomend to have a competetant bathroom fitter to discuss an issue with this matter Hopefuly it will help Best regards Rafal
