What Types of Development Are “Not Inappropriate” in the Green Belt?
Understand which types of development are not inappropriate in the Green Belt under NPPF policies GB6, GB7 and GB8, including the closed list of exceptions, the grey belt route, the new station-proximity route, and the Golden Rules.
GREEN BELT
Andrew Ransome
8/17/20268 min read
Green Belt policy starts from a position of restraint. The National Planning Policy Framework (NPPF), as republished in August 2026, provides that development in the Green Belt is inappropriate unless it falls within one of the categories set out in policy GB7.
Inappropriate development is, by definition, harmful to the Green Belt and should not be approved except in very special circumstances. That remains the starting point for assessing almost every proposal in the Green Belt, and it is set out in policy GB6.
Importantly, however, the NPPF does not impose a blanket prohibition on development.
Instead, it sets out a defined series of exceptions where development will not be regarded as inappropriate.
The first question should therefore be whether a proposal falls within one of those exceptions. If it does, there is no need to demonstrate very special circumstances.
This article has been updated to reflect the restructuring of Green Belt policy in the August 2026 Framework, in which the former paragraphs 154 and 155 have been recast as distinct, numbered policies: GB6 (control of development), GB7 (development which is not inappropriate) and GB8 (the Golden Rules).
The Structure of the Exceptions: A Closed List
Policy GB7 sets out an exhaustive list of circumstances in which development in the Green Belt will not be regarded as inappropriate.
Their legal significance is well established.
In R (Lee Valley Regional Park Authority) v Epping Forest District Council [2016], the Court of Appeal confirmed that national Green Belt policy contains a closed list of exceptions. Decision-makers cannot create additional categories. If a proposal does not fall within one of the specified exceptions, it is inappropriate development and must be justified by very special circumstances.
The Supreme Court subsequently confirmed in R (Samuel Smith Old Brewery (Tadcaster)) v North Yorkshire County Council [2020] that concepts such as "inappropriate development", "very special circumstances" and "openness" are matters of planning judgment to be applied sensibly in their policy context, rather than rigid legal tests.
Both cases were decided against the previous paragraph-based structure of the NPPF, but the underlying principle — that the categories in national policy are fixed and exhaustive, while their application requires judgment — continues to apply with equal force to policy GB7.
GB7(1)(a)–(e): Buildings, Infilling and Redevelopment
The following types of development are not inappropriate under policy GB7(1), subject to the relevant criteria:
Development for agriculture, horticulture and forestry, or development solely for nature conservation, restoration and/or enhancement (GB7(1)(a)).
The reuse, extension, alteration or replacement of an existing building, provided the existing building is of permanent and substantial construction, is lawful in planning terms, and any extension or alteration will not result in a disproportionate increase in size compared to the original building. A replacement building must be for the same use and not materially larger than the one it replaces (GB7(1)(b)).
Limited infilling in villages lying within the Green Belt (GB7(1)(c)).
Limited affordable housing for local community needs under policies set out in the Framework or the development plan, including on a rural exception site (GB7(1)(d)).
The redevelopment of previously developed land, including a material change of use to residential or mixed use including residential, provided this would not cause substantial harm to the openness of the Green Belt (GB7(1)(e)).
These categories are, carried forward from the equivalent provisions in the December 2024 NPPF.
The reference point for the "original building" test remains fixed — for extensions and alterations this is the building as it existed on 1 July 1948 (or, if constructed after that date, as it was first built), so the cumulative effect of any earlier extensions still counts against the current proposal.
GB7(1)(f): A Softer Openness Test for Infrastructure-Type Development
Policy GB7(1)(f) groups together a set of "other forms of development" that are not inappropriate, provided the impact on the openness of the Green Belt is minimised, and there would not be a significant conflict with the Green Belt purposes. This bundled category covers:
Mineral extraction and processing, engineering operations, and transport, electricity network, water and telecommunications infrastructure required in a Green Belt location;
Development brought forward under a Community Right to Build Order or Neighbourhood Development Order;
Material changes in the use of land, such as changes of use for outdoor sport or recreation, or for cemeteries and burial grounds; and
The provision of appropriate facilities, including buildings, for outdoor sport, outdoor recreation, cemeteries, burial grounds and allotments.
This is a genuine, substantive change from the previous wording, which required these forms of development to "preserve" openness and not conflict "with the purposes of including land within" the Green Belt at all.
The August 2026 test is deliberately softer: openness need only be minimised in its impact, and conflict with Green Belt purposes must be significant before the exception is lost.
In practical terms, this gives applicants and their advisers more room to argue that a proposal with some visual or spatial impact still falls within the exception, rather than being tipped into "inappropriate development" territory on a comparatively modest impact.
The change is likely to be most relevant to infrastructure and engineering-led schemes, where some impact on openness is often unavoidable.
GB7(1)(g): The Grey Belt Route
Policy GB7(1)(g) provides a further route by which development may be regarded as not inappropriate. It applies to development on grey belt land, but only where all of the following apply:
The development would utilise grey belt land and would not fundamentally undermine the purposes (taken together) of the remaining Green Belt across the area of the plan;
There is an evidenced unmet need for the type of development proposed;
The development would be in a sustainable location, with particular reference to policy TR3; and
In the case of major development involving the provision of housing, the development complies with policy GB8 (the Golden Rules).
This is the same grey belt mechanism introduced by the December 2024 NPPF, now embedded as a distinct sub-paragraph of GB7 rather than sitting in a standalone paragraph.
The definition of grey belt itself is unchanged. Land in the Green Belt comprising previously developed land and/or other land that does not strongly contribute to Green Belt purposes (a), (b) or (d) — sprawl, merging of towns, and the setting of historic towns.
The methodology for identifying grey belt at the plan-making stage is now set out in full in Annex E of the Framework, rather than relying solely on planning practice guidance, which gives the assessment somewhat firmer footing when it is tested at examination.
GB7(1)(h): A New Route via Well-Connected Stations
The most significant structural change in this part of the NPPF is the introduction of policy GB7(1)(h), which did not exist in the December 2024 version.
Residential or mixed-use development is not inappropriate in the Green Belt where it would:
Be within reasonable walking distance of a well-connected station (applying the Annex B glossary definition);
Be physically well-related to the station or the settlement within which it is located;
Be of a scale which can be accommodated taking into account existing or proposed infrastructure availability;
Not prejudice any proposals for long-term comprehensive development in the same location; and
In the case of major development, comply with policy GB8.
This route operates independently of the grey belt test in GB7(1)(g).
There is no requirement to demonstrate that the land is grey belt, nor to evidence an unmet need in the same way.
Instead, the qualifying factor is proximity and physical relationship to a well-connected station, as defined by service frequency in Annex B.
This is reinforced at the plan-making stage by policy GB3(4), which provides that where a development plan's spatial strategy has identified suitable land around well-connected stations for release, exceptional circumstances do not need to be separately demonstrated to justify altering the Green Belt boundary.
GB8: The Golden Rules
Where major development involving the provision of housing comes forward under either the grey belt route (GB7(1)(g)) or the station-proximity route (GB7(1)(h)), policy GB8 requires three contributions, commonly referred to as the Golden Rules:
Affordable housing, set either in line with development plan policy for Green Belt sites, or, in the absence of such policy, at 15 percentage points above the highest requirement that would otherwise apply, capped at 50% (with a 50% default where no pre-existing requirement exists);
Necessary improvements to local or national infrastructure; and
New or improved green space that is accessible to the public, contributing to the landscape setting of the development and to nature recovery.
Substantial weight is given to compliance with the Golden Rules when such applications are determined.
The Continuing Importance of Openness
The concept of openness remains central to Green Belt policy, even where the applicable test has been softened for certain categories of development.
In Samuel Smith, the Supreme Court confirmed that assessing openness is a matter of planning judgment and that both spatial and visual impacts may be relevant.
That principle applies as much to the "minimised impact" test in GB7(1)(f) as it did to the "preserve openness" test it replaces — the exercise is still one of judgment on the facts, informed by the site's context, scale and visibility.
But the threshold an applicant now needs to clear under GB7(1)(f) is lower than before.
Why the Restructuring Matters for Planning Strategy
The existence of these exceptions has important practical consequences.
Before considering whether very special circumstances might exist, applicants should first assess whether their proposal falls within one of the recognised categories in policy GB7(1)(a) to (f), or qualifies under the grey belt route in GB7(1)(g) or the new station-proximity route in GB7(1)(h).
If it does, the proposal is not inappropriate development and does not need to be justified by very special circumstances.
Although, for major housing schemes under (g) or (h), it will still need to satisfy the Golden Rules in GB8.
If it does not fall within any of these categories, the applicant faces the considerably more demanding task of demonstrating that very special circumstances clearly outweigh the harm to the Green Belt and any other harm arising from the proposal, as set out in policy GB6.
Even where development is not inappropriate, planning permission is not automatic. The proposal must still be assessed against the wider development plan and other material considerations, including design, heritage, highways, landscape and residential amenity.
Green Belt Exceptions Summary
The August 2026 NPPF does not prohibit all development in the Green Belt.
It restructures the closed set of exceptions into policy GB7, softens the openness test for a defined category of infrastructure-type development, retains the grey belt route with its methodology now anchored in Annex E. It also adds an entirely new route for residential and mixed-use development around well-connected stations.
Policy GB8 then sets out the contributions expected from major housing schemes that come forward under either of the two "release" routes.
For anyone considering development in the Green Belt, determining whether a proposal falls within one of these policy exceptions — and, where relevant, whether it can meet the Golden Rules — should be the starting point for any planning strategy.
If no exception applies, the proposal will ordinarily require the demonstration of very special circumstances.
Planning Application Advice
If you own land or a building in the Green Belt and want to understand your development options, I can advise on planning strategy and manage your application from initial assessment through to decision. Contact me to discuss your site.
Andrew Ransome MRTPI - Email: andrew@andrewransome.co.uk
About me
Andrew Ransome is a Planning Director and a Chartered Member of the Royal Town Planning Institute (RTPI), with more than two decades of experience in town planning.
He specialises in delivering strategic planning solutions for complex developments across both rural and urban environments, helping clients navigate planning challenges and unlock development opportunities. Connect with Andrew on Linkedin.
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