I'm starting the building of a man cave and a man shed, where I live we build em strong, my end of our village is a conservation area which means no match stick house builds allowed.
Cave will be an outer course of 8" thick stone, a middle course of 4" concrete blocks and an inner course of 4" concrete blocks, about 2ft thick including insulation and air gaps.
Garden shed will be an outer course of 8" thick stone, 4" concrete block and 6" insulation as when my wife is not using it for gardening I'll use it as a spray booth and carbon fibre oven
Mr Wolf can huff and puff but he aint getting in to this little piggy's house