Bear in mind that ornamental gateposts are subject to the same rules as those that apply to other means of enclosure – fences, walls and gates.
You will need to apply for planning permission if you wish to erect or add to a fence, wall or gate and:
Fences, walls and gates do not require building regulation approval.
Although building regulations do not apply, the structures must be structurally sound and maintained.
If the garden wall is classed as a 'party fence wall' and depending on the type of building work you intend to carry out, then you must notify the adjoining owner of the work in respect of the Party Walls Act etc 1996. This does not include wooden fences.