Here you'll learn when planning permission is required for a change in the use of land or buildings.
Last updated: 2 July 2025
All buildings and land fall under a planning use class (or are considered ‘sui generis’, a Latin term meaning ‘in a class of its own’). Use classes determine what a building or plot of land will be used for by its owner or occupier. The Town and Country Planning (Use Classes) Order 1987 (as amended) groups common uses of land and buildings into different categories, known as ‘use classes’. The uses within each class are, for planning purposes, considered to be broadly similar to one another.
Here are the current use classes, which were last updated 20 October 2022 by the Town and Country Planning (Use Classes) (Amendment) (Wales) Order 2022.
A change of use of land or buildings will require planning permission if the change is considered ‘material’ (significant) in terms of its impact on the surrounding area. The local planning authority (LPA) decides whether or not a change of use is material but the general presumption is that a change from one use class to another or involving any sui generis use (also referred to as ‘unique’ uses) will constitute a material change of use. Sui generis uses are those which do not fall within any of the specified classes.
Planning permission is not needed when both the present and proposed uses fall within the same class (movement from one use to another within the same use class is not considered to be development).
There are also certain permitted development rights that allow for some changes of use to occur between different use classes without having to apply for planning permission.
The change of use of land or buildings has the potential to harm wildlife if impacts aren’t properly assessed and mitigated against.
Check planning applications to ensure that any changes in use are being carefully considered and assessed. You should contact the LPA as soon as you can if you have any comments or concerns.