You can apply to make non-material amendments to existing planning permissions under s.96A of the Town and Country Planning Act 1990.
Following a grant of planning permission, it may be necessary to make small amendments to the permission, for example changing a finish or moving a door or window.
You can apply to amend an application on the Planning Portal.
The fees are:
(a) if the application is a householder application - £34
(b) in any other case - £234