Im looking to build a log cabin at the rear of my garden which backs on to the rear gardens of 2 other properties, my ideal size works out to be 18m2 and will be within 1m of the boundaries. Now from my understanding I can not build this from a combustible material ie "wood" but i constantly see log cabins in my area clearly bigger than than 15m2 so whats the deal here, are people just chancing it? I don't really want to contact the council and ask questions unless i have to as that may draw unwanted attention.