There are many different definitions and criteria for the same thing in different legislation. You conform the requirements of the particular Act you are meant to be conforming to.
Typically from the highest point around the property. As my extension has protruded into the hill, I now find my front door/DPC/FFL to be a bit below ground! If I were to measure GL from that point (and I think I should) I should add +150mm to my ridge height, easy. But the council may have other ideas. They mentioned something like using the existing property levels as a reference point, which I will argue is the DPC which is the same all around, whereas the ground levels are all over the place.
No tolerance? How would some bod from planning measure the height to a ridge?
A tape measure or a barrel of monkeys?
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