What is grey belt, Green Belt, greenfield and brownfield?

 

Green Belt, grey belt, greenfield and brownfield are four different planning ideas, and they are often confused. Green Belt is a formal planning-policy designation. In London, Metropolitan Open Land is a separate designation, although the adopted London Plan gives it the same status and level of protection as Green Belt. Grey belt is a category of land within the Green Belt. Brownfield is the everyday name for previously developed land (PDL). Greenfield is common planning shorthand for land which has not previously been developed, but it is not itself a national designation.

The distinctions matter because a field can be greenfield and Green Belt, while a former factory can be brownfield and Green Belt. A brownfield site is not automatically suitable for development, and Green Belt does not mean countryside of particular landscape or ecological quality.

This page deals with planning policy in England. The August 2026 National Planning Policy Framework has changed the Green Belt rules again. In particular, it revises the definition of grey belt, introduces a separate route for certain housing and mixed-use development near well-connected stations, and reorganises Green Belt policy into policies GB1 to GB8.

Green Belt is a planning designation, not a description of the land

 

Green Belt is land identified in the development plan for a particular strategic planning purpose. The fundamental idea is to keep land permanently open and prevent urban sprawl. It is not an environmental designation in the way that a National Landscape, Site of Special Scientific Interest or Local Nature Reserve is.

Green Belt can therefore contain farmland, woodland, golf courses, villages, houses, industrial premises, quarries, utilities, car parks and previously developed sites. The appearance of the land does not tell you whether it is Green Belt: you need to check the development plan and policies map.

As at 31 March 2025, the latest published Government statistics estimate that England had about 1,633,220 hectares of Green Belt, around 12.5% of England’s land area. The next release is provisionally scheduled for October to November 2026.

 

The five purposes of the Green Belt

 

The five established Green Belt purposes remain at the heart of national policy. In plain English they are to:

• check the unrestricted sprawl of large built-up areas;
• prevent neighbouring towns from merging into one another;
• assist in safeguarding the countryside from encroachment;
• preserve the setting and special character of historic towns; and
• assist urban regeneration by encouraging the recycling of derelict and other urban land.

Those five purposes still matter in plan-making and in assessing how particular land performs. But the 2026 grey-belt definition deliberately focuses on the contribution land makes to only three of them: the purposes concerned with sprawl, merging and the setting/special character of historic towns.

 

How the August 2026 NPPF organises Green Belt policy

 

The new Framework separates plan-making and decision-making much more clearly. Policies GB1 to GB5 deal principally with the strategic and plan-making side of Green Belt, including establishing Green Belts, assessing existing Green Belt land, reviewing boundaries and securing beneficial uses.

For a live planning application, the most important policies are generally:

• GB6 – Control of development in Green Belt, which deals with inappropriate development and the weight given to Green Belt harm;
• GB7 – Development which is not inappropriate in the Green Belt, which identifies routes where development is not treated as inappropriate; and
• GB8 – Golden Rules, which sets the additional community benefits required for qualifying major housing development on land within or released from the Green Belt.

The Framework also moves detailed Green Belt assessment principles into its own annex, giving those assessment principles policy status rather than leaving all of the detail in separate Planning Practice Guidance.

 

What is grey belt?

 

Grey belt is still Green Belt. It is not a new colour on the policies map and it does not mean the land has been removed from the Green Belt. It is a national policy category used when assessing Green Belt land.

A current example is the 600-home Croxley Green appeal, where officers and councillors disagreed over grey-belt status and the August 2026 NPPF arrived before the appeal was decided.

The exact August 2026 definition matters. Grey belt is Green Belt land comprising previously developed land and/or other land which, in either case, does not strongly contribute to any of purposes (a), (b) or (d) in GB2.

That phrase “in either case” is important: previously developed land is not automatically grey belt. A brownfield site within the Green Belt must still pass the same contribution test. If it strongly contributes to even one of the three relevant purposes, it is not grey belt under the current definition.

The three purposes tested for grey-belt status are:

• GB2(a) – checking unrestricted sprawl of large built-up areas;
• GB2(b) – preventing neighbouring towns merging into one another; and
• GB2(d) – preserving the setting and special character of historic towns.

Purposes (c), safeguarding the countryside from encroachment, and (e), encouraging urban regeneration, remain Green Belt purposes but are not part of the grey-belt classification test.

Annex E provides the assessment method. Land can make a moderate, weak or no contribution to the relevant purposes and still fall within the grey-belt definition; what prevents grey-belt status is a strong contribution to any one of (a), (b) or (d). Annex E also makes clear that purpose (a) concerns large built-up areas rather than villages, purpose (b) concerns towns rather than villages, and purpose (d) concerns historic towns rather than villages.

The definition is therefore about the planning function of the land, not whether it looks unattractive, neglected or literally grey.

 

The footnote 7 exclusion has gone from the grey-belt definition

 

This is an important August 2026 change. The December 2024 grey-belt definition excluded land where policies relating to certain protected areas or assets – commonly called the “footnote 7” areas – would provide a strong reason for refusing or restricting development.

The 2026 Framework removes that extra limb from the definition of grey belt. That makes the identification question cleaner: first decide whether the land meets the Green Belt performance definition. Heritage, flood risk, protected landscapes, habitats sites and other protections are then assessed under their own national policies in the normal way.

Removing footnote 7 from the definition does not remove those protections. It prevents them doing two jobs at once – determining whether land is grey belt and then being applied again to the development proposal.

 

What happened to the Wrotham grey-belt argument?

 

Wrotham Parish Council v Secretary of State for Housing, Communities and Local Government & Ors [2026] EWHC 165 (Admin) became important under the December 2024 wording. The High Court considered the old footnote-7 limb and held that the “strong reason for refusing or restricting development” question was applied to the development actually proposed, rather than to hypothetical development of the land.

That judgment remains useful history for understanding the December 2024 grey-belt definition, but the particular limb it interpreted has now been removed. The August 2026 definition no longer uses the footnote-7 test when deciding whether land is grey belt. Heritage, flood risk, Protected Landscapes, habitats and other constraints can still be decisive when the proposal itself is assessed under the relevant national policies.

Planning Geek warning: as at 20 August 2026, the Government’s online Green Belt Planning Practice Guidance still contains wording based on the previous NPPF definition. For a current grey-belt assessment, use the August 2026 NPPF, particularly the glossary and Annex E, while the PPG catches up.

 

Grey belt does not mean automatic permission: the GB7(1)(g) route

 

Identifying land as grey belt is only the first stage. For development to be treated as not inappropriate under the principal grey-belt route in GB7(1)(g), all of the policy requirements still need to be satisfied.

The proposal must:

• utilise grey-belt land and not fundamentally undermine the Green Belt purposes, taken together, of the remaining Green Belt across the area of the plan;
• meet an evidenced unmet need for the type of development proposed;
• be in a sustainable location, with particular reference to policy TR3; and
• for major development involving housing, comply with the GB8 Golden Rules.

For housing, the NPPF defines the unmet-need limb for this purpose as either the authority being unable to demonstrate the required five year housing land supply, including the relevant buffer, or a result below 75% in the most recent Housing Delivery Test. For Traveller sites, the NPPF uses a separate unmet-need test for GB7(1)(g): the local planning authority cannot demonstrate a five-year supply of deliverable Traveller sites. A site can therefore be grey belt but still fail the GB7(1)(g) route if, for example, there is no evidenced unmet need or the location is unsustainable.

 

Brownfield Green Belt has a separate route: GB7(1)(e)

 

This distinction is easy to miss and can be commercially important. Previously developed land does not need to qualify as grey belt in order to use the separate PDL route in GB7(1)(e).

GB7(1)(e) treats the redevelopment of previously developed land – including a material change of use to residential or mixed use including residential – as not inappropriate Green Belt development where it would not cause substantial harm to the openness of the Green Belt.

So a brownfield Green Belt site which strongly contributes to one of purposes (a), (b) or (d) may fail the grey-belt definition, yet still have a potential GB7(1)(e) route. Unlike GB7(1)(g), GB7(1)(e) does not require an evidenced unmet need, a five year housing land supply failure or a Housing Delivery Test result below 75%. Conversely, being PDL does not guarantee success: the PDL boundary must be established correctly and the proposed redevelopment must pass the openness test.

This is why it is wrong to treat “brownfield in the Green Belt” and “grey belt” as synonyms.

 

A separate Green Belt route around well-connected stations

 

One of the biggest new opportunities in the August 2026 NPPF is separate from grey belt altogether.

GB7(1)(h) provides a separate route by which certain residential and mixed-use development near qualifying railway, Underground, tram and light-rail stops is treated as not inappropriate in the Green Belt, provided the detailed tests are met.

The site does not have to be grey belt to use this route. The development must be within reasonable walking distance of a well-connected station, be physically well-related to the station or its settlement, be of a scale which can be accommodated by existing or proposed infrastructure, not prejudice long-term comprehensive development in the same location and, for major development, comply with GB8.

The glossary defines reasonable walking distance as around 800 metres, or around 10 minutes’ walk where topography, route availability or quality, or physical barriers would prevent or discourage walking from up to 800 metres away. If only part of a site falls within that walking distance, the station policy applies only to that part.

A well-connected station is also specifically defined. It must be a railway station or Underground, tram or light-rail stop within a top-80 Travel to Work Area by Gross Value Added. The 2023 GVA data continue to be used until the day after publication of the 2028 GVA data. In the normal weekday timetable the station must be served, or have a reasonable prospect of being served through planned upgrades or agreement with the operator, throughout the daytime by at least four trains or trams per hour overall, or at least two per hour in any one direction. It is therefore not enough simply to identify any station on a map.

This is a sufficiently important new policy that development around well-connected stations deserves separate detailed analysis rather than being treated as a branch of grey belt.

 

What development can be not inappropriate in the Green Belt?

 

Grey belt and stations are not the only routes. GB7 also carries forward and reorganises familiar categories of Green Belt development, including agricultural and forestry development, certain sport and recreation uses, specified reuse, alteration, extension or replacement of buildings, limited infilling and other forms of development which meet the detailed policy tests.

A notable 2026 drafting change is that the agricultural provision now refers to development rather than only buildings, recognising that legitimate agricultural development can involve more than a building.

Whether a proposal is “not inappropriate” is important because the very special circumstances test applies to inappropriate development. If development falls within a GB7 category and satisfies its conditions, it does not first have to prove very special circumstances merely to overcome inappropriateness. The same threshold distinction was explained under the earlier NPPF in R (Lee Valley Regional Park Authority) v Epping Forest District Council [2016] EWCA Civ 404: development treated by Green Belt policy as not inappropriate did not need very special circumstances merely to overcome Green Belt inappropriateness, although it could still be unacceptable under other planning policies.

If no GB7 route applies, GB6 says inappropriate development is harmful to the Green Belt and should not be approved except in very special circumstances. Those circumstances do not exist unless the harm by reason of inappropriateness and any other harm is clearly outweighed by other considerations, with substantial weight given to Green Belt harm including harm to openness. Energy infrastructure can raise this issue in practice; our guide to BESS planning permission looks at battery storage, Green Belt and alternative-site evidence.

 

What does Green Belt “openness” mean?

 

Openness is one of the essential characteristics of Green Belt, but it is not simply a question of whether a development can be seen. The courts have repeatedly treated openness as a broad planning concept.

In Turner v Secretary of State for Communities and Local Government [2016] EWCA Civ 466, the Court of Appeal recognised that openness can have both spatial and visual aspects. The subsequent Supreme Court judgment in R (Samuel Smith Old Brewery (Tadcaster)) v North Yorkshire County Council [2020] UKSC 3 expressly discussed and approved that aspect of Turner, while confirming that visual impact may be relevant but is not an essential or mandatory component in every case: the assessment is a matter of planning judgment in the circumstances.

For a GB7(1)(e) PDL proposal, where the current test is whether redevelopment would cause substantial harm to openness, it is therefore sensible to examine the scale, volume and spread of built development, the amount of open land affected, the duration and character of the use, and relevant visual effects rather than reducing the exercise to a single landscape-view question.

 

What are the Green Belt Golden Rules?

 

Policy GB8 applies where major development involving the provision of housing is proposed on land released from the Green Belt through plan preparation or review, or on a site in the Green Belt through a planning application.

The three Golden Rules require:

• affordable housing at the applicable enhanced level;
• necessary improvements to local or national infrastructure; and
• new publicly accessible green space or improvements to existing green space, meeting the detailed landscape, nature-recovery and accessibility requirements in GB8.

Where a Green Belt-specific development-plan affordable-housing requirement is already in place, that policy applies. Until such policies are in place, GB8 generally requires 15 percentage points above the highest existing affordable-housing requirement which would otherwise apply, capped at 50%. If there is no pre-existing affordable-housing requirement, the default is 50%. The 50% cap itself does not apply to rural exception sites, community-led development exception sites, or where a relevant existing local policy would require more than 50% affordable housing.

There are important express exceptions. The Golden Rules do not apply to development brought forward on land released from the Green Belt through plans adopted before 12 December 2024, development which was granted planning permission on Green Belt land before that date, or Traveller sites.

GB8 also tightly controls when a site-specific viability assessment may be submitted. The three circumstances are where the proposal is:

• on PDL and demonstrably burdened by costs associated with the previous development which were not taken into account in the viability assessment informing the development plan;
• for a strategic site; or
• for a development of a wholly different type from that considered in the viability assessment informing the development plan.

So the Golden Rules should not be presented as a headline percentage followed by a routine viability negotiation. The current GB8 wording is deliberately much more specific.

The Charlton Road scheme at Keynsham is a useful current example. With the council able to demonstrate only around 2.5 years of housing land supply, officers treated the site as grey belt under GB7 and the Golden Rules increased the affordable housing requirement from the usual 30% to 45% — potentially 90 of the 200 homes. The committee resolution remains subject to conditions and the Section 106 agreement.

 

What is brownfield land?

 

Brownfield is the common name for previously developed land (PDL). The current NPPF definition is broader than the old shorthand of “land with an old building on it”. Our dedicated PDL guide also explains the new S5(1)(d) opportunity for residential redevelopment outside settlements, including equestrian yards, former military sites and other rural brownfield land.

In broad terms, it includes land which has been lawfully developed and is or was occupied by a permanent structure and associated fixed surface infrastructure. It also includes large areas of lawfully developed fixed surface infrastructure such as substantial areas of hardstanding.

The definition has important exclusions. These include land that is or was last occupied by agricultural or forestry buildings, certain minerals, landfill and renewable/low-carbon energy development where restoration provision exists, specified land in built-up areas such as residential gardens, parks, recreation grounds and allotments, and land where the remains of the permanent structure or fixed surface structure have blended into the landscape.

Brownfield is therefore a policy status based on the planning history and physical development of the land. It is not synonymous with contaminated, derelict or ugly land.

 

Does brownfield mean permission should be granted?

 

No. National policy gives strong support to making effective use of suitable brownfield land, particularly within settlements, but “brownfield” does not cancel flood risk, heritage, ecology, access, design, amenity or other planning considerations.

And because previously developed land can lie inside the Green Belt, a brownfield site also needs to be tested against the Green Belt decision-making policies. Do not assume PDL automatically means grey belt: under the August 2026 definition, PDL must also not strongly contribute to any of GB2 purposes (a), (b) or (d). Even if it is not grey belt, however, redevelopment may still have the separate GB7(1)(e) route where it would not cause substantial harm to openness.

On mixed sites, establish the PDL boundary rather than applying the label to the whole ownership. A developed yard, buildings and qualifying curtilage can have a different PDL status from adjoining paddocks, fields or other open land. Our previously developed land guide explains this in detail.

Case law warning: a bit of brownfield does not make the whole site PDL

This point has been tested in the courts. In R (Lee Valley Regional Park Authority) v Broxbourne Borough Council [2015] EWHC 185 (Admin), the High Court made clear that the presence of some previously developed land within an application site does not make the whole site PDL; the definition itself draws an important boundary by reference to the developed land and its curtilage.

More recently, R (on the application of Ribble Valley Borough Council) v Secretary of State for Housing, Communities and Local Government and Majid Hussain [2025] EWHC 2363 (Admin) concerned an equestrian site. The High Court quashed the permission after the Inspector treated the whole site as PDL without properly analysing the developed and undeveloped parts. The court also held that the fact land was in equestrian use was not itself a basis for treating it as PDL: what mattered was the extent of qualifying development, curtilage and fixed surface infrastructure. That is particularly relevant to stable yards, manèges and paddocks.

 

What is greenfield land?

 

Greenfield is useful planning shorthand for land which has not previously been developed, commonly fields, farmland or undeveloped open land. Unlike Green Belt, grey belt or the formal NPPF definition of previously developed land, greenfield is not defined in the NPPF and is not a national policy designation.

It is also unsafe to treat “greenfield” as the exact legal opposite of PDL. The NPPF deliberately excludes some physically developed land from its PDL definition – for example land that is or was last occupied by agricultural or forestry buildings. Such land may fail the PDL definition even though describing a substantial developed farmyard as untouched “greenfield” would be misleading.

A greenfield site can be within the Green Belt or completely outside it. Likewise, land outside the Green Belt is not automatically greenfield: towns and cities contain huge areas of previously developed land which are not Green Belt.

If an undeveloped site lies outside a settlement, the current S5 policy for development outside settlements and the development plan will usually be more important to the decision than the informal label “greenfield” itself.

 

The four terms in one example

 

Imagine several different sites at the edge of a town:

• An undeveloped field in the Green Belt which makes only a moderate or weak contribution to purposes (a), (b) and (d) may be greenfield + Green Belt + grey belt.
• An undeveloped field in the Green Belt which strongly contributes to even one of those three purposes is greenfield + Green Belt, but not grey belt.
• A lawful industrial yard in the Green Belt which strongly contributes to purpose (b), for example by forming an important part of the gap between two towns, may be brownfield + Green Belt but not grey belt. It may nevertheless have a separate GB7(1)(e) PDL redevelopment route.
• A lawful industrial yard in the Green Belt which does not strongly contribute to any of purposes (a), (b) or (d) can be brownfield + Green Belt + grey belt.
• An unused factory site outside the Green Belt is brownfield but neither Green Belt nor grey belt, while an undeveloped field outside the Green Belt is normally described simply as greenfield.

That is why the labels should never be used interchangeably. In particular, brownfield does not automatically mean grey belt, and grey belt does not automatically mean brownfield.

 

How to check a Green Belt site properly

 

A useful assessment is a sequence rather than a single label:

1. Is the land actually Green Belt? Check the adopted development plan and policies map. Do not decide from how rural or green the site looks.
2. Is any of the site PDL? Apply the current NPPF definition and identify the PDL boundary. Do not assume the whole ownership or planning unit shares the same status.
3. Is it grey belt? Assess purposes GB2(a), (b) and (d) using Annex E. A strong contribution to any one of those purposes prevents grey-belt status.
4. Which GB7 route actually fits the proposal? PDL may use GB7(1)(e); qualifying grey-belt development may use GB7(1)(g); qualifying station-related housing may use GB7(1)(h); and other proposals may fall within the other GB7 categories.
5. Do the Golden Rules apply? Check GB8 for major housing and its express exceptions.
6. What other policies can still stop or reshape the scheme? Heritage, flood risk, ecology, Protected Landscapes, design, access, infrastructure and other national and development-plan policies remain relevant.

Grey-belt status is therefore a planning assessment, not a separate designation which every council must have already coloured grey on its policies map. Existing council Green Belt reviews can provide useful evidence, but they may have been prepared under earlier policy and should not simply be treated as a current Annex E assessment.

The Searchland example below is useful for viewing Green Belt boundaries and other planning constraints together, but the legal and policy assessment must use the current development plan and August 2026 NPPF.

 

Green Belt is not Local Green Space

 

Green Belt should also not be confused with Local Green Space. They are separate planning designations with different purposes and policy tests. Likewise, a conservation area, National Landscape, SSSI or heritage designation can overlap the Green Belt without becoming part of the Green Belt definition itself.

This distinction has become particularly important since the 2026 removal of the old footnote-7 exclusion from the grey-belt definition: the other designation still matters, but it matters under its own policy.

 

Where to go next

 

If you are looking at housing land in or around the Green Belt, read this page alongside our guides to building outside a settlement boundary, the presumption in favour of sustainable development, settlement boundaries, five year housing land supply and the Housing Delivery Test.

For rural and farm development, see our Agriculture & Equestrian section. Development that already benefits from permitted development rights should instead be checked against the relevant class in the GPDO.

 

Relevant policy and guidance

 

• National Planning Policy Framework – August 2026 – particularly the Green Belt policies, relevant annex and glossary definitions;
• Planning Practice Guidance: Green Belt – supporting guidance, but as at 20 August 2026 its online grey-belt wording still reflects the previous NPPF definition. Use the August 2026 NPPF glossary and Annex E for the current grey-belt test;
• Local authority Green Belt statistics 2024–25 – latest published national statistics as at this page update.

Conservation, Heritage & Protected Sites

 

Grey Belt, Green Belt, Greenfield & Brownfield Page Updated: 4th September 2026