What Is Grey Belt Land in the Green Belt?
What is Grey Belt land in the Green Belt? Learn how the new NPPF definition works, which sites qualify, and when development is permitted under the Golden Rules.
GREEN BELT
Andrew Ransome
6/29/20265 min read
The concept of grey belt was introduced by the December 2024 National Planning Policy Framework and represents the most significant change to Green Belt policy in England since the designation framework was established in the 1950s.
For the first time, the NPPF provides a route for development on certain Green Belt land that does not depend on demonstrating very special circumstances — provided the land qualifies as grey belt and the development meets the Golden Rules.
This article explains what grey belt is, how it is identified, what conditions must be met for development to be not inappropriate, and what the Golden Rules require.
The Definition of Grey Belt in the NPPF
The NPPF Annex 2 Glossary defines grey belt as:
land in the Green Belt comprising previously developed land and/or any other land that, in either case, does not strongly contribute to any of purposes (a), (b), or (d) in paragraph 143. Grey belt excludes land where the application of the policies relating to the areas or assets in footnote 7 (other than Green Belt) would provide a strong reason for refusing or restricting development.
Two limbs: the first captures previously developed land (PDL) within the Green Belt — land lawfully developed and occupied by a permanent structure and associated fixed surface infrastructure.
The second captures any other land — whether PDL or not — that does not strongly contribute to purposes:
(a) checking urban sprawl,
(b) preventing settlement merger, or
(d) preserving the setting of historic towns.
Note: only three of the five Green Belt purposes are relevant. Land can score against purposes (c) (safeguarding the countryside from encroachment) and (e) (assisting urban regeneration) and still qualify as grey belt, provided it does not strongly contribute to (a), (b) or (d).
The Footnote 7 Exclusions
Grey belt expressly excludes land subject to Footnote 7 designations where these provide a strong reason for refusing or restricting development.
These include:
Local Green Space;
National Landscapes;
National Parks and the Broads;
Heritage Coast;
Irreplaceable habitats (including ancient woodland, ancient and veteran trees, blanket bog, limestone pavement, sand dunes, salt marsh and lowland fen);
Designated heritage assets and assets of archaeological interest; and areas at risk of flooding or coastal change.
Land subject to these constraints is not grey belt even if it otherwise makes no strong contribution to purposes (a), (b) or (d).
How Is Grey Belt Land Identified?
The Planning Practice Guidance on Green Belt, sets out how grey belt should be assessed.
Identification requires a Green Belt assessment testing each parcel's contribution to the three relevant purposes. The assessment must be proportionate to the scale of the decision.
For a planning application, the applicant must produce assessment evidence demonstrating that the specific site qualifies. The boundary between land that 'does not strongly contribute' and land that does is a matter of planning judgement, and one that will be tested through planning applications, planning appeals and examinations as the concept develops in practice.
Purposes (a) and (b) are about location and spatial function — not aesthetic quality.
Scrubby or degraded land in a location that performs a clear coalescence-prevention function will not qualify as grey belt simply because it is unattractive.
When Is Development on Grey Belt Not Inappropriate?
Paragraph 155 sets out four conditions, all of which must be met:
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 a demonstrable unmet need for the type of development proposed. For housing, this means the local planning authority cannot demonstrate a five-year supply of deliverable housing sites (with relevant buffer), or that the Housing Delivery Test indicates delivery below 75% of the requirement over the previous three years.
The development would be in a sustainable location, with particular reference to paragraphs 110 and 115 of the NPPF.
Where applicable, the development meets the Golden Rules in paragraphs 156–157.
Where all four conditions are met, the development is not inappropriate.
Substantial weight need not be given to Green Belt harm, and the VSC test does not apply.
More than that: paragraph 158 provides that a development complying with the Golden Rules should be given significant weight in favour of the grant of permission.
The Grey Belt 'Golden Rules'
a) Affordable Housing
Affordable housing must reflect either:
(i) development plan policies produced in accordance with paragraphs 67–68 of the NPPF; or
(ii) until such policies are in place, 15 percentage points above the highest existing affordable housing requirement that would otherwise apply, subject to a cap of 50%.
Where there is no pre-existing affordable housing requirement, 50% applies by default.
Site-specific viability assessment for Green Belt land is subject to the approach set out in national planning practice guidance on viability.
b) Infrastructure
Necessary improvements to local or national infrastructure must be provided.
The NPPF does not specify a minimum quantum or scope, but the obligation must be proportionate with the development's infrastructure impacts — typically secured by planning obligation under section 106 of the Town and Country Planning Act 1990.
c) Green Spaces
New or improved green spaces accessible to the public must be provided.
Paragraph 159 sets out that these must contribute positively to the landscape setting of the development, support nature recovery and meet local standards for green space provision where these exist in the development plan.
Where no local standards exist, national standards apply.
Where land has been identified for habitat creation or nature recovery within Local Nature Recovery Strategies, proposals should contribute to these outcomes.
Grey Belt and the Sequential Approach to Release
Paragraph 148 establishes a sequential hierarchy for Green Belt release in plan-making: previously developed land first, then grey belt which is not previously developed, then other Green Belt locations.
Sustainable location is an overarching consideration throughout.
In decision-taking on individual applications, the relevant question is whether the land qualifies as grey belt and whether the paragraph 155 conditions are met.
Grey Belt Summary
Grey belt is a new concept still being tested through the planning system.
Key uncertainties include: the precise threshold for 'does not strongly contribute'; the treatment of brownfield character and visual degradation; the application of the 'fundamentally undermine' test; and the transitional arrangements for plans already at advanced stages of preparation.
Grey belt is defined as PDL in the Green Belt and/or any land making no strong contribution to purposes (a), (b) or (d), subject to Footnote 7 exclusions.
Development on grey belt land satisfying the four conditions in paragraph 155 is not inappropriate — removing the need for VSC.
A scheme complying with the Golden Rules (affordable housing at plan-policy level or 15 percentage points above the highest existing requirement capped at 50%, necessary infrastructure, and accessible green spaces) must be given significant weight in favour of approval.
These concept represents a material new route that did not exist before December 2024.
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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