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Grey belt checker

Is your small site grey belt?

Six guided questions for landowners with small Green Belt parcels (typically 1-20 homes). The checker applies the grey belt definition in the National Planning Policy Framework (2026) and tells you whether the site looks worth assessing properly. It is not a planning decision — but it stops you wasting time chasing a category that does not fit.

Updated for the 2026 framework. Grey belt is now defined against policy GB2, and the old footnote 7 list of designations no longer forms part of the test. Those designations still matter, but as policies in their own right rather than by stopping land qualifying as grey belt.

Current judgement

Possibly grey belt

Worth investigating — the answer hinges on how 'strongly' the parcel contributes to Green Belt purposes.

Is the parcel in the Green Belt?

Check the council's policies map. Grey belt only exists inside the designated Green Belt.

Is the parcel previously developed land (PDL)?

PDL means land with substantial buildings or hard surfaces — small farmyards, redundant outbuildings, paddocks with redundant stables, former workshops. Domestic gardens, agricultural land and parks are excluded.

Does the parcel strongly check the sprawl of a large built-up area?

NPPF purpose (a). Most small edge-of-settlement parcels do not — a few homes rarely move the needle on city or large-town sprawl. Strong contribution usually means a meaningful buffer against a major urban edge.

Does it strongly prevent neighbouring towns merging?

NPPF purpose (b). Only counts where the parcel sits in a strategic gap between two named settlements. A small parcel inside a wider gap is usually not, on its own, doing the strategic work.

Does it strongly preserve the setting of a historic town?

NPPF purpose (d). The setting of a designated historic town — not just any village with old buildings. Most small parcels are too small to materially affect a historic town's setting.

Do any protective designations affect the parcel?

National Landscapes, National Parks, SSSIs, SAC/SPA/Ramsar, irreplaceable habitats, designated heritage assets and functional floodplain. Under the 2026 framework these no longer decide whether land is grey belt. That turns solely on the GB2 purposes above. They apply separately, through policies N4, N6, HE6, F6 and F7, and can refuse a scheme on land that is grey belt. Tick what is actually engaged on this parcel, not merely nearby.

Verdict

Possibly grey belt

Confidence: Medium

Your answers suggest a moderate contribution to one or more grey belt purposes. The test is whether the contribution is strong — so a small site on the borderline can still qualify with the right scoring evidence.

Want a mapped grey belt read?

A free site assessment checks Green Belt boundaries, designations and policy context against your boundary.

Assess site

Grey belt is one limb of the Green Belt route in the 2026 framework. To see it alongside every other route, and what else your site would still have to satisfy, use the full NPPF check.

Suggested next steps

1

Get an independent Green Belt purposes assessment for the specific parcel — 'strongly contributes' is a judgement, not a fact.

2

Check whether any recent local plan review or call for sites has already scored the parcel.

3

Look at nearby small-site grey belt approvals or appeal decisions for read-across.

4

Decide whether Permission in Principle, an outline application or a pre-application is the right next step.

The Golden Rules (GB8)

Even where a site is grey belt, major development involving housing has to make all three of these contributions:

  • Affordable housing: either the development plan requirement for Green Belt land set under HO5(1)(a)(ii), or, until such a policy is in place, the highest existing requirement plus 15 percentage points, capped at 50%. Where no requirement already applies, 50% applies by default.
  • Necessary improvements to local or national infrastructure.
  • New or improved green space, accessible to the public, within a short walk of new homes. It should contribute to the landscape setting, support nature recovery, and meet local standards where they exist.

They do not apply to:

  • Land released from the Green Belt through a plan adopted before 12 December 2024.
  • Planning permissions granted on Green Belt land before 12 December 2024.
  • Traveller sites.

Major for housing means 10 or more homes, or a site of 0.5 hectares or more. Below that, GB8 does not apply at all.

Important caveats

  • ‘Strongly contributes’ is a judgement — councils, inspectors and appellants can legitimately disagree.
  • Purpose (c) — safeguarding the countryside from encroachment — is deliberately excluded from the grey belt test.
  • Qualifying as grey belt only clears the principle of development. A scheme can still be refused under the designation policies, or fail the Golden Rules.
  • This checker does not replace a planning consultant’s assessment.