What Is Grey Belt Land? The Four Tests

Grey belt definition: what counts as grey belt land

Annex B of the NPPF defines grey belt as Green Belt land made up of "previously developed land and/or any other land". Either kind qualifies only if it "does not strongly contribute" to purposes (a), (b) or (d) of policy GB2.

Those three purposes are checking the sprawl of large built-up areas, keeping neighbouring towns apart and protecting historic towns. The countryside purpose (c) and the urban regeneration purpose (e) play no part in the grey belt test.

Two points follow from the wording. First, previously developed land is not grey belt by default: it must also fail to strongly serve the three purposes. Second, a field with no buildings can be grey belt.

The glossary excludes land last occupied by farm or forestry buildings from previously developed land. Gardens, parks, recreation grounds and allotments in built-up areas are excluded too. Our guide to Green Belt rules and exceptions covers the wider policy.

If an agent calls a site grey belt, first ask which row of this table it sits in.

How councils assess grey belt in a Green Belt assessment

Policy GB2(3) says local plans should be informed by an assessment that identifies grey belt. Annex E of the NPPF sets the process. Its stages run in this order:

1. Draw the areas. Split all the Green Belt in the plan area into assessment areas.
2. Score the purposes. Judge each area against purposes (a), (b) and (d).
3. Identify grey belt. Areas that do not strongly contribute become grey belt.
4. Test the whole. Check whether release would fundamentally undermine the five purposes of the remaining Green Belt.

Annex E wants areas small enough to show variation. The guidance says a small number of large areas is generally not appropriate. Smaller areas may suit land around settlements or public transport hubs.

What strong, moderate and weak mean

Annex E gives criteria for each purpose. Only a strong score keeps land out of grey belt.

Moderate sits between them. Nearby physical features, existing buildings, landform or partial enclosure by development all weaken a score.

Two limits matter. Villages are not large built-up areas for purpose (a), and purpose (b) concerns towns, not villages. Where a plan area has no historic towns, Annex E says purpose (d) may need no detailed assessment.

Next step: look up your council's latest Green Belt assessment and note how it rated your site's area. That rating is the first evidence for test 1.

The four grey belt tests and the evidence for each

Grey belt status alone does not secure consent. Under policy GB7(1)(g), development on grey belt is not inappropriate only when all four tests are met. Government guidance warns that grey belt status does not make approval right "in all circumstances".

Tests 1 and 2: the land and the need

For test 1, start with the council's published assessment. If the site sits in an area scored strong, the case needs a finer parcel study. Where no plan or assessment identifies the site, the guidance asks the council to consider evidence on its contribution.

Footnote 41 sets two triggers for unmet housing need. One is a council that cannot show five years of deliverable sites, buffer included. The other is delivery below 75% of the requirement over the previous three years, measured by the Housing Delivery Test.

The supply position is a snapshot that the council updates. Read its latest statement before you agree a price.

Tests 3 and 4: location and the Golden Rules

Policy TR3 asks for locations that limit car travel and offer a genuine choice of transport. It says the government's Connectivity Tool should be used alongside other evidence.

Test 4 covers major housing alone, meaning 10 or more homes or a site area of 0.5 hectares or more. Below that, the Golden Rules do not apply, but tests 1 to 3 still do.

Golden Rules: affordable housing % and viability cases

Policy GB8 sets three Golden Rules for major housing in the Green Belt. They cover planning applications and land released through a local plan. A scheme is expected to deliver all three:

1. Affordable housing. Whatever share the local plan sets for Green Belt land. Until a plan does, 15 percentage points above the highest current requirement.
2. Infrastructure. Upgrades to local or national infrastructure where the scheme makes them necessary.
3. Green space. Publicly accessible green space, new or upgraded, that residents can reach on a short walk.

The affordable figure cannot go above 50%. If the council has no requirement at all, the default is 50%. GB8(2) gives substantial weight to compliance.

Footnote 44 lifts the cap in three cases. These are rural exception sites, community-led exception sites, and an existing local policy above 50%.

When a viability case is allowed

GB8(3) allows a viability assessment against the Golden Rules in three cases only:

1. Burdened previously developed land. Costs from the past use that the plan's viability work did not account for.
2. A strategic site. A phased scheme with a masterplan, typically 1,500 homes or more.
3. A wholly different type of scheme. One the plan's viability work did not consider.

In any of these cases, the scheme should still contribute as much as it can. A contribution significantly below the Golden Rules is accepted only in exceptional cases, fully evidenced and justified.

Footnote 43 exempts permissions granted, and plans adopted, before 12 December 2024. Traveller sites are exempt too. Put the affordable share in your appraisal before you set a land price.

Evidence to submit with a grey belt planning application

A grey belt application has to prove each test, not assert it. Where the council's assessment is old or broad, the applicant's evidence carries more of the weight.

For sites no plan has identified, the guidance asks the council to weigh evidence on set questions. Two go to the core. Does the site strongly contribute to purposes (a), (b) or (d)? Would building it fundamentally undermine the remaining Green Belt?

For previously developed land, add proof of lawful use and the permanent structures on site. Planning history, lawful development certificates and dated photographs all help. Our guide to the NPPF explained covers the policies around these tests.

Keep each item tied to the test it answers. A clear pack lets the case officer check every test against the policy wording.

Already hold part of the pack? Send it to us for a free first view of where each test stands.

Sourcing grey belt sites: how we find and test them

Grey belt can be used as a sales label. An agent's pack may call land grey belt before any council has scored it. We start from the policy, not the label.

1. Read the assessment. We find the council's Green Belt assessment and the score for the area around the site.
2. Score the parcel. We test the land against the Annex E criteria and look for features that contain it.
3. Check the need. We read the latest supply and delivery position, and note how it could move.
4. Test the location. We look at walking, cycling and public transport access under TR3.
5. Price the Golden Rules. Our residual appraisal carries the affordable share, infrastructure and green space.
6. Cost the build. Our own team prices the build, so the land value rests on real numbers.

There is no official figure yet for how much grey belt exists. Each site is a judgement, so the first view matters most before you offer.

In his previous roles, our Development Director Rob Barton acquired £225M+ of land and took 10,000+ homes through planning. Think your land is grey belt, or been sent a site by an agent? Share the pack with us and ask for a free first view.