Long before I even prepared the first garden under the bay window at the rear of the house, we used to get a lot of shade from the afternoon sun from the house next door, to the west.
It was traumatic for me to see that in May 1992, five years since we had moved in, the magnificent weeping willow was being removed. Apparently it was badly diseased and it was a necessity, but I grieved for that tree, as it had been lovely to look at. Furthermore, we had been a little slow in planting out that side of the garden with trees, having relied on the shade from next door.
Just goes to show, you should plan your own garden to create shade where you want it, because over your neighbours you really have no control.