Over the last couple of months, there has been the odd time that's there's a rotten egg smell in the porch (inside, front of house) I have been trying to work out when this happens and it seems to be after any heavy rain.
Has anyone come across this before ?
Just thought I would ask, before I start lifting the floor, as the front and one side of the entrance is UPVC i'm beginning to wonder if there's a leak and the floorboards are rotten, or there's water lying under the floor.