So if they are just going to stack a block wall on top of the hill it doesn't sound like it would help at all. Thats kind of what it sounds like since the bottom of the slope is on your neighbors property.So I had one masonary come for an estimate (best I could do). Estimates $5k to build a retaining wall on my property by lifting the pavers digging down and then redoing the pavers. Saying this will give me another 10 years on the pool. This doesn’t lift the skimmer or completely solve the problem just slows it down.