My neighbour has built a large new extension that now heavily overlooks my 30ft long garden. The end fence (which is theirs) is already slightly over 6ft tall as it stands on concrete gravel boards. The extension ground floor stands 3ft higher than the top of the fence as their land is higher. So they can look out of their huge kitchen window and see all of my garden. In addition, there is a large bedroom window above also giving a birds-eye view. I'm thinking the only thing I can do is plant trees but they won't totally disguise the house. My neighbour is against me planting any kind of dense hedging like Yew or trees because the fence is already at max hedge height 6ft and it would block out the sun to their tiny garden.
I thought about putting in some very tall posts with only thin wires between them and then growing roses along them, so it's tall but pretty from both sides. So perhaps adding another 3 -4ft higher than the fence. The extension is nicely built but it devalues my house now as I'm so overlooked. Any ideas?