The permitted development rules have recently been relaxed allowing you to build an extension without planning permission of up to six metres or eight metres if your house is detached. The exact requirements will depend on the location of the agricultural land or field and the intended use for your shed. Shedplans12x24 Goat Shed Plans India Storage Shed Kits Plans 10 X 10 Wood Shed Plans Ranch Shed Floor Plans Shed Plans 12x16 Shed House Plans 12x20 Shed Plans The following allowances for building a shed without a permit apply to private houses only. How big can you build a wooden shed without planning permission . Wooden garages should be a single storey log cabin. If the shed stands less than 2 metres from one or more boundaries of the property the overall height should not exceed 25 metres. In the case of designated land planning permission will still be required. In the case of a dual pitched roof the maximum total height of your wooden garage should be 4 metres and th