We are the end of a small terraced block of houses (4) with all the back gardens built at a gradient where the top of the garden is higher than the bottom by the house (new homes for you - but that's another issue)! Our next door neighbours who have been there for just over a year have now built a decking area which covers the whole width and top half of the garden. To accommodate the gradient (I assume) the decking is really high to the point that when they are on it I can see them up from their waist level so they can obviously see completely into our garden now and because of the layout of our house into our living room which is at the back of the house.
AIBU to be annoyed at this? I was hoping to get some tips on how best to handle this, reasonable steps to resolve. Obviously i don't expect them to dismantle it but higher fence or trellis could help. TIA