Our NDN has an L shaped guarding (like an upside down L) so part of their garden backs on to ours. They are having a massive log cabin constructed and the roof has just gone on. I'm really unhappy at how much it spoils the view from our garden as they have built it adjacent to the fence. Can I do anything about it now? Would you say/do anything? Can I make them change the roof to a flat roof instead of pitched? Bearing in mind we will likely have an extension in a few years and would need them to be on side. Picture below