Please advise , where do I stand legally..?! The neighbour downstairs is placing a kitchen fan extractor right under my living room window. I live on the ground floor apt in a Victorian grade 2 listed terrace on Westbourne Terrace in Westminister. A developer just bought the basement flat currently under renovations. I know he's trying to flip it when he finishes. I can already see potential buyers visiting. He's changed the kitchen from the back to the front of the building and it's now right under my living room. Today, when I left I noticed a big drilled whole about 90cm below my window. He's placing the kitchen fan extractor on the facade of the building. In the summer I always keep the living room window wide open and there is a beautiful breeze circulating around. The thought of having some cooking stench blowing in is upsetting. How could someone be allowed to drill a 15cm whole and install an extractor on the facade of a grade two listed building? I am not sure if he's got permission, any advise is greatly appreciated. Pls see photos.