Pursuant to section 57 of the Town and Country Planning Act 1990 (TCPA 1990), planning permission is required for ‘the carrying out of any development of land’. ‘Development’ is defined in TCPA 1990, s 55(1) as: • the carrying out of building, engineering, mining or other operations in, on, over or under land (see Practice Note: Operational development), or • the making of any material change in the use of any buildings or other land (see Practice Note: Material change of use) TCPA 1990, s 58(1)(a) provides that planning permission may be granted by a ‘development order’. The Town and Country Planning (General Permitted Development) (England) Order 2015 (GPDO 2015), SI 2015/596 and the Town and Country Planning (General Permitted Development) Order 1995 (GPDO 1995), SI 1995/418 (together the GPDO) are development orders for these purposes. They allow specific types of development, set out in different classes in Schedule 2 of the GPDO, to be carried out without the need to obtain planning permission. Development which falls within a particular class of permitted