If it is between 15 and 30m2 then in needs to be non combustible or 1m from a boundary even your biggest shed is under 15m2 so wood and right against a fence is fine. building regulations if you want to put up small detached buildings such as a garden shed or summerhouse in your garden, building regulations will not normally apply if the floor. Hi, i'm hoping for some clarification regarding positioning of garden buildings in relation to boundaries. the planning portal states. "outbuildings and garages to be single storey with maximum eaves height of 2.5 metres and maximum overall height of four metres with a dual pitched roof or three metres for any other roof.. If you plan to build your shed within 1.5m of a boundary then you have a maximum allowable length of 9m. this 9m allowance also includes any other sheds, carports and garden sheds on that same boundary. lets say you wanted to extend your shed with a garaport (gable carport) out the front of your existing shed. your shed side wall is only 600mm.
