This development is exempt development from the requirement to obtain planning permission (class 5, Schedule 2 of the Planning Regulations - see below).
There are a number of conditions and limitations on this exemption -
CLASS 5:
The construction, erection or alteration, within or bounding the curtilage of a house, of a gate, gateway, railing or wooden fence or a wall of brick, stone, blocks with decorative finish, other concrete blocks or mass concrete.
Conditions & Limitations:
1. The height of any such structure shall not exceed 2 metres or, in the case of a wall or fence within or bounding any garden or other space in front of a house, 1.2 metres.
2. Every wall other than a dry or natural stone wall bounding any garden or other space shall be capped and the face of any wall of concrete or concrete block (other than blocks with decorative finish) which will be visible from any road, path or public area, including public open space, shall be rendered or plastered.
3. No such structure shall be a metal palisade or other security fence.