Planning policy sets the framework for deciding where development should take place, what form it should take and which areas should be protected. In England, national policy is principally contained in the National Planning Policy Framework. Local Plans translate national policy into a strategy and policies for a particular area. Green Belt and Grey Belt are related policy concepts that influence how development proposals are assessed, but they do not mean that development is either automatically prohibited or permitted.

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What is the National Planning Policy Framework?

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The National Planning Policy Framework, usually referred to as the NPPF, sets out the Government’s planning policies for England and explains how they should be applied.

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It covers matters including:

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• housing and economic growth;

• town centres;

• design;

• transport;

• climate change;

• Green Belt;

• the natural and historic environment; and

• the preparation of Local Plans.

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The NPPF is national policy rather than legislation. It does not itself grant or refuse planning permission and it does not replace the policies in an adopted Local Plan. However, it is an important material consideration when planning applications and appeals are determined.

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How is the NPPF used in planning decisions?

 

Planning applications must generally be determined in accordance with the statutory development plan unless material considerations indicate otherwise. The NPPF is one of the most important material considerations.

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Where the relevant policies in a Local Plan are up to date, they will usually provide the starting point for the decision. National policy can nevertheless influence how those policies are interpreted and applied.

 

The NPPF can become particularly influential where:

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• the Local Plan is out of date;

• the council cannot demonstrate the required supply of deliverable housing sites;

• relevant local policies are absent or inconsistent with national policy; or

• the proposal raises a matter addressed directly by national policy.

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In some circumstances, the NPPF’s presumption in favour of sustainable development may require planning permission to be granted unless one of the specified policy exceptions applies or the adverse impacts would significantly and demonstrably outweigh the benefits.

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The outcome always depends on the NPPF being read as a whole. Individual paragraphs should not normally be treated as isolated tests.

 

How often is the NPPF updated?

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The Government updates the NPPF periodically to reflect changes in national priorities. The current framework was published in December 2024 and amended in February 2025.

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Changes to the NPPF can affect both emerging Local Plans and live planning applications. Transitional arrangements may determine when a new policy applies to a plan being prepared, but revised national policy will usually become a material consideration in development management decisions as soon as it is published.

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What is a Local Plan?

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A Local Plan is a planning document prepared by a local planning authority. It establishes a strategy for the future development of its area and contains the policies used to determine planning applications.

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A Local Plan will usually identify:

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• how much housing and employment development is required;

• where new development should be located;

• sites allocated for particular uses;

• areas subject to protection or restraint;

• requirements for affordable housing and infrastructure;

• policies governing design, heritage, transport and the environment; and

• the standards against which individual proposals will be assessed.

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Local Plans are intended to look ahead over a minimum period established by national policy. They should provide a positive vision for the area while making sufficient provision for housing, employment, infrastructure and other development needs.

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How is a Local Plan prepared?

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A council must assemble evidence, assess development needs, consider reasonable alternatives and consult the public and other interested parties.

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The proposed plan is then submitted to the Secretary of State and examined by an independent planning inspector. The inspector considers whether the plan has been prepared in accordance with the relevant legal and procedural requirements and whether it is sound.

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To be found sound, a Local Plan must be:

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• positively prepared;

• justified;

• effective; and

• consistent with national policy.

 

The inspector may recommend main modifications where these are necessary to make the plan sound. Once adopted, the Local Plan forms part of the statutory development plan.

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Does every planning application have to comply with the Local Plan?

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The Local Plan is the starting point for determining planning applications, but its policies are not applied mechanically.

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Section 38(6) of the Planning and Compulsory Purchase Act 2004 requires decisions to be made in accordance with the development plan unless material considerations indicate otherwise. Relevant material considerations may include national policy, emerging policy, the planning history of the site, design, heritage impacts, housing need and other site-specific benefits or harms.

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A proposal that conflicts with one Local Plan policy is therefore not necessarily unacceptable. The decision-maker must assess the development plan as a whole and determine the weight to give to the conflict and to any competing considerations.

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In some areas, the development plan contains more than the Local Plan. It may also include a spatial development strategy, such as the London Plan, neighbourhood plans and certain other adopted planning documents.

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What is Green Belt?

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Green Belt is a planning policy designation intended principally to prevent urban sprawl by keeping land permanently open. It is not a description of landscape quality, environmental value or public accessibility.

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Green Belt land can include farmland, woodland, recreational land, previously developed land and sites containing existing buildings. Conversely, attractive countryside is not necessarily Green Belt.

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The NPPF identifies five purposes of Green Belt:

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• checking the unrestricted sprawl of large built-up areas;

• preventing neighbouring towns from merging into one another;

• safeguarding the countryside from encroachment;

• preserving the setting and special character of historic towns; and

• assisting urban regeneration by encouraging the recycling of derelict and other urban land.

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Is development prohibited in the Green Belt?

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Development in the Green Belt is not completely prohibited. However, the construction of new buildings and certain other forms of development are generally treated as inappropriate unless they fall within an exception identified in national policy.

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Potential exceptions include certain:

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• buildings for agriculture and forestry;

• facilities for outdoor sport and recreation;

• extensions and alterations to existing buildings;

• replacement buildings;

• limited infilling in villages;

• redevelopment of previously developed land; and

• forms of development that preserve openness and do not conflict with Green Belt purposes.

 

Whether an exception applies depends on the precise nature, scale and effects of the proposal.

 

Where development is inappropriate, it is by definition harmful to the Green Belt and should not be approved except in very special circumstances. Very special circumstances will not exist unless the potential harm to the Green Belt, together with any other harm, is clearly outweighed by other considerations.

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This is a demanding policy test, although its application remains a matter of planning judgement.

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Can Green Belt boundaries be changed?

 

Green Belt boundaries are normally changed through the plan-making process rather than through an individual planning application.

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Once established, boundaries should only be altered where exceptional circumstances are fully evidenced and justified. Where a council cannot meet its identified development needs without reviewing the Green Belt, national policy expects it to consider whether changes are necessary.

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The current NPPF requires authorities reviewing Green Belt boundaries to give priority to previously developed land, followed by Grey Belt that is not previously developed, before considering other Green Belt locations.

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What is Grey Belt?

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Grey Belt is land within the Green Belt that makes a limited contribution to specified Green Belt purposes. The concept was introduced into national policy through the December 2024 NPPF.

 

Grey Belt may comprise previously developed land or other Green Belt land that does not strongly contribute to:

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• checking the unrestricted sprawl of large built-up areas;

• preventing neighbouring towns from merging; or

• preserving the setting and special character of historic towns.

 

Land will not qualify as Grey Belt where policies protecting certain other important areas or assets, such as habitats sites, Sites of Special Scientific Interest, National Landscapes, National Parks, irreplaceable habitats, designated heritage assets or areas at risk of flooding or coastal change, provide a strong reason for refusing or restricting development.

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Is Grey Belt the same as brownfield land?

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No. Brownfield land and Grey Belt are overlapping but distinct concepts.

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Brownfield land is land that has previously been developed, subject to exclusions contained in the NPPF definition. Grey Belt can include previously developed land, but it can also include undeveloped Green Belt land that does not strongly contribute to the relevant Green Belt purposes.

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Equally, not every brownfield site in the Green Belt will necessarily be suitable for development. Other policies, constraints and site-specific impacts must still be considered.

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Does Grey Belt cease to be Green Belt?

 

No. Identifying land as Grey Belt does not automatically remove it from the Green Belt.

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Grey Belt is a policy category within the Green Belt. Its identification affects how development or possible release is assessed, but the land remains within the Green Belt unless its boundary is formally changed through the plan-making process.

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Does Grey Belt status mean planning permission will be granted?

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Grey Belt status does not create an automatic permission or a general presumption that the site should be developed.

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Under the NPPF, development on Grey Belt land will not be inappropriate Green Belt development where all the relevant conditions are satisfied. These include:

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• the development would use Grey Belt land and would not fundamentally undermine the purposes of the remaining Green Belt across the plan area;

• there is a demonstrable unmet need for the type of development proposed;

• the development would be in a sustainable location; and

• where applicable, the proposal satisfies the Green Belt “Golden Rules”.

 

For major housing development, the Golden Rules concern affordable housing, necessary infrastructure and the provision or improvement of accessible green space.

 

Even where development is not inappropriate in Green Belt terms, the application must still be considered against the development plan and the NPPF as a whole. Matters such as design, transport, heritage, ecology, flood risk and infrastructure may remain decisive.

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Who decides whether land is Grey Belt?

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A council may identify Grey Belt through a Green Belt assessment undertaken during the preparation or review of its Local Plan. However, the question can also arise when an individual planning application or appeal is determined.

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The absence of a site from an existing council assessment does not necessarily prevent an applicant from arguing that it meets the national policy definition. Evidence will normally be required to assess the site’s contribution to the relevant Green Belt purposes, the effect on the remaining Green Belt and any other policy constraints.

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Key points

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• The NPPF contains the Government’s planning policies for England and is an important material consideration.

• A Local Plan provides the statutory planning strategy and policies for a particular area.

• Green Belt is intended primarily to maintain openness and manage urban growth, rather than to protect landscape quality.

• Development in the Green Belt is possible, but inappropriate development normally requires very special circumstances.

• Grey Belt is a category of land within the Green Belt; it is not another term for brownfield land.

• Grey Belt status can change the policy assessment, but it does not guarantee that planning permission will be granted.

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When should professional advice be sought?

 

Policy issues are often decisive at the earliest stage of a project. Professional advice may be appropriate when assessing whether a proposal complies with an adopted or emerging Local Plan, whether relevant policies are up to date, whether land could qualify as Grey Belt, or whether the benefits of a proposal could justify development in the Green Belt.

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Updated 27 July 2026