Dh and I bought our house 6 years ago partly because the back garden is not overlooked by any houses and is very quiet - a rarity in the part of London where we live. There is a small private road which runs at the back and beyond that there is a large back garden which belongs to a house on the corner of the next crescent along.
However, when we got back from holiday last week, the owner has built the biggest monster of a tree house at the back of his garden which his three children play in very noisily and alot. The father sits up there in the evening with a book too. Their garden is on a slighter higher level than ours and therefore looks directly over and into the back of our house. We have quite an open plan house with long sliding doors at the back so, from the treehouse, anyone can see quite far into the house.
Does anyone know whether this kind of construction needs planning permission at all?