I have an extension that houses a bathroom (i'm no expert but I think poorly built), whatever the time of year and bearing in mind I have the windows open all the time and an extractor fan on, the bathroom is full of condensation and mould all day every day. Whatever I do I cannot seem to combat the problem. The extension has 3 outside walls, the 4th wall is connected to the kitchen which also has 2 outside walls. I think the extension is breeze block. Any ideas?
