Dying Tree?

My wife pointed out that a tree just past our boundary was dying. On my inspection, the majority of the branches are on the left side of the tree, with many dead/missing branches on the right-hand-side. If this tree came down then it’d take out our chicken coop and our ladies and damage our garden retaining wall. Next step, ring around and find someone who can take a look and provide an expert eye as to whether the tree is diseased and whether it does pose a risk.

Having had an insurance claim last year, I don’t want another one.