What counts as grey belt under the 2026 NPPF?

The purpose that is deliberately left out

Green Belt has five purposes. The grey belt test uses only three of them: (a) checking unrestricted sprawl, (b) preventing neighbouring towns merging, and (d) preserving the setting and special character of historic towns.

Purpose (c), safeguarding the countryside from encroachment, is excluded. That omission is the point. Most Green Belt land does serve purpose (c) simply by being open, so including it would have made the category almost empty.

Strongly is doing a lot of work

The test is not whether the land contributes, but whether it contributes strongly. A small parcel at the edge of a village rarely does the strategic job of holding back a city or keeping two towns apart, even though it is technically part of the belt that does.

This is a judgement, not a fact, and councils, inspectors and appellants can legitimately disagree. Some authorities have published Green Belt purposes assessments that score parcels individually, which is worth finding before you commission your own.

What being grey belt actually gets you

It is a gateway, not permission. Land qualifying as grey belt also has to not fundamentally undermine the purposes of the remaining Green Belt taken together, be in a sustainable location, and, for major housing, comply with the Golden Rules.

Crucially it also requires an evidenced unmet need, and here the wording is narrow: only a five year housing land supply shortfall, including any relevant buffer, or a delivery test result below the threshold. Other kinds of shortage do not count.

One thing that no longer applies

Under the previous framework a footnote listed designations that took land out of the grey belt category. That list is no longer part of the test. National Landscapes, SSSIs, heritage assets and functional floodplain still bite, but as policies in their own right rather than by preventing land from qualifying as grey belt.