Permitted development
Permitted development rights allow certain types of works and changes of use to be carried out without a full planning application. But the interaction between permitted development and supporting statements is a common source of confusion. This guide explains when you need a statement, when you don't, and when one can still add value even if it isn't strictly required.
If your project genuinely falls within permitted development rights and you are not making a planning application, you do not need a planning supporting statement. A supporting statement is a document submitted in support of a planning application — and if there is no application, there is nothing to support.
However, the question of whether your project truly falls within PD is often less straightforward than it appears — and that is where things get more complicated.
Permitted development rights are granted by Parliament through the Town and Country Planning (General Permitted Development) (England) Order 2015 (the GPDO). They allow certain categories of development to be carried out without needing to make a planning application, provided the works fall within defined parameters — limits on size, height, materials, location, and so on.
Common examples of householder permitted development include:
PD rights are more restricted than many people assume. A planning application — and therefore a supporting statement — will be required in the following circumstances:
If your proposed extension, outbuilding, or loft conversion exceeds the GPDO parameters — even slightly — it falls outside permitted development and requires full planning permission. Check the limits carefully before assuming PD applies.
LPAs can remove PD rights in specific areas through Article 4 Directions. These are commonly used in conservation areas, Article 4 HMO areas, and some suburban residential areas where the council wishes to control incremental change. If an Article 4 Direction applies to your property, works that would otherwise be PD will require a planning application.
PD rights are more restricted for properties in conservation areas, Areas of Outstanding Natural Beauty, National Parks, the Broads, and World Heritage Sites. For example, cladding the exterior of a house, or adding a side extension, requires planning permission in a conservation area even though it might be PD elsewhere.
Most householder PD rights apply only to dwellinghouses. They do not apply to flats or maisonettes, which require planning permission for almost all external works.
Some categories of PD — including larger home extensions under Class A of the GPDO — require a prior approval application to the LPA before works begin. Prior approval is not a full planning application, but the LPA does assess certain limited matters (typically impact on neighbours). A brief supporting statement confirming that the works fall within the PD parameters and addressing the prior approval criteria can be submitted with a prior approval application, though it is not always required.
Larger home extensions: Under the neighbour consultation scheme, single-storey rear extensions between 4m and 8m (detached) or 3m and 6m (other houses) require a prior approval application. The LPA consults neighbours and can impose conditions — but cannot refuse permission on design grounds.
Even where works are technically permitted development, a brief supporting statement or covering letter can be useful in the following situations:
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