See how big can i build a shed in my garden without planning permission? list of related videos of how big can i build a shed in my garden without planning permission?. If, however, your garden building does comply with the above criteria, you won't need to apply for planning permission and you can have a garden building up to 30m2 (internal size). anything bigger than 30m2 will need to go through building regulations.. Can you please shed i currently have to live with the disastrous consequences of planning permission being granted without consideration being namely they are living on a site from which they are being removed despite the fact that no planning permission has yet clubs in england will bear the brunt of the cuts until 2012, losing