Very special circumstances in the Green Belt
Substantial weight attaches to Green Belt harm, and the considerations relied on must clearly outweigh all of it. Most cases fail by arguing the wrong half of the balance.
Very special circumstances green belt cases start from a hard rule: inappropriate development is by definition harmful to the Green Belt and should not be approved except in very special circumstances. National policy then defines the test. Very special circumstances will not exist unless the potential harm by reason of inappropriateness, and any other harm, is clearly outweighed by other considerations.
Read that twice. It is not a balance of probabilities. Substantial weight attaches to Green Belt harm, and the other considerations have to clearly outweigh the whole of the harm, including harm to openness, landscape, highway safety or anything else the council identifies.
What makes development inappropriate
The Framework lists categories that are not inappropriate. Anything outside those lists is inappropriate, and the label attaches before anyone has looked at the design.
For buildings, the recognised exceptions include buildings for agriculture and forestry, facilities for outdoor sport and outdoor recreation, cemeteries and allotments where openness is preserved, the extension or alteration of a building provided it does not amount to disproportionate additions over and above the size of the original building, the replacement of a building in the same use and not materially larger, limited infilling in villages, limited affordable housing for local community needs, and limited infilling or redevelopment of previously developed land subject to an openness test.
Other forms of development are also treated as not inappropriate, including mineral extraction, engineering operations, local transport infrastructure that can demonstrate a requirement for a Green Belt location, material changes in the use of land such as changes to outdoor sport or cemeteries, and the re-use of buildings that are of permanent and substantial construction.
Two practical points come out of that list. A material change in the use of land, without building, has a much easier path than a new building, which is why paddock and outdoor recreation proposals often succeed where a shed does not. And the extension test compares against the original building, meaning as built or as it stood on 1 July 1948, not against the house as extended by previous owners.
Cite the Framework's Green Belt chapter by its current edition, published in August 2026, and check the wording against the published text rather than working from an older copy.
The five purposes and the openness test
The Green Belt serves five purposes: checking the unrestricted sprawl of large built-up areas, preventing neighbouring towns merging into one another, assisting in safeguarding the countryside from encroachment, preserving the setting and special character of historic towns, and assisting urban regeneration by encouraging the recycling of derelict and other urban land.
Openness is the essential characteristic, alongside permanence. The Supreme Court has confirmed that openness has visual as well as spatial dimensions, so the assessment is not simply a volume calculation. Height, spread, the extent of hardstanding, the degree of activity generated and the visual effect from surrounding land all form part of it.
That matters when arguing a scheme. A building of the same volume as the one it replaces can still reduce openness if it spreads across the plot rather than standing tall, or if it brings lighting, vehicles and boundary treatment where there was none. Conversely, a proposal that removes existing clutter can improve openness while adding floorspace.
Where the visual dimension is contested, a Landscape and Visual Impact Assessment prepared to the recognised guidelines gives the argument evidence rather than adjectives. It should identify viewpoints rather than describe the site in general terms.
What has to be outweighed
The harm side of the balance has at least two components and often more.
Harm by reason of inappropriateness comes first and attracts substantial weight as a matter of policy. Harm to openness comes second, assessed spatially and visually. Then any other harm: landscape character, the setting of a heritage asset, highway safety, loss of best and most versatile agricultural land, ecology.
A common error is to argue only against the third category. An applicant who shows the scheme causes no landscape harm has not addressed inappropriateness at all, and the officer report will say so in a single line.
The other side of the balance is everything relied on as very special circumstances. That can include the benefits of the proposal, the absence of alternative sites, the fallback position if a lawful alternative could be implemented anyway, and in limited cases the personal circumstances of the applicant.
Considerations that carry weight, and how they combine
The courts have held that the considerations relied on need not themselves be rare or unusual. What matters is whether, taken cumulatively, they clearly outweigh the harm. So an argument built from several ordinary factors can succeed where each factor alone would not.
Considerations that regularly carry weight:
- a genuine fallback: an extant permission or permitted development right that would produce a comparable or worse outcome, which needs to be a real prospect rather than a theoretical one
- the absence of any suitable alternative site, evidenced by a search with stated criteria rather than an assertion
- benefits secured by obligation, such as the removal of existing buildings, land management, or public access
- functional need for a countryside location, particularly for agricultural, forestry or outdoor sport uses
- personal circumstances, which can justify a temporary or personal permission but rarely a permanent one
Weak arguments are equally predictable. Financial viability of the applicant's own scheme, a desire for a larger house, the fact that the site is screened by trees, and the presence of other development nearby all get short shrift, because none engages the policy harm.
Where the case rests on what happens on a particular piece of land, be precise about which land you mean. The planning unit the council assesses is not always the red line on your drawing, and a definition dispute can undermine an otherwise sound case.
Where grey belt sits
The December 2024 edition of the Framework introduced grey belt as a category of Green Belt land, broadly land that is previously developed or that does not strongly contribute to specified Green Belt purposes, with development on it treated differently and subject to conditions about affordable housing, infrastructure and green space.
The concept has been carried into later editions with amendments, and both the definition and the accompanying tests have been the subject of guidance since. Check the current Framework text and the associated practice guidance before relying on it, and say in your statement which edition you have applied. Where a council has assessed grey belt land through its plan-making, that assessment carries considerable weight and is where the argument should start.
Grey belt does not remove the very special circumstances test for development that remains inappropriate. It changes which development is inappropriate in the first place, which is a different point and one that is often blurred in submissions.
Building the case with evidence
A very special circumstances case is a document, not a paragraph.
- State the development plan position and identify which Framework category, if any, the proposal falls within.
- If the proposal is inappropriate, say so plainly. Arguing that a plainly inappropriate scheme is somehow appropriate wastes the reader's patience.
- Assess openness spatially and visually, with figures for footprint, volume and height compared against the existing situation.
- Identify every other harm the council might find, and address each.
- Set out the considerations relied on, each with its own evidence, and state the weight you say attaches to it.
- Carry out the balance explicitly, in the policy's own words, and conclude.
- Offer the mechanisms that secure the benefits: obligations, conditions, removal of existing structures.
Illustrative example. A replacement dwelling scheme on a Green Belt plot proposes a house 40 per cent larger in volume than the existing bungalow. The applicant relies on the removal of four dilapidated outbuildings, a reduction in developed footprint, and a landscape scheme securing hedgerow restoration. Whether that clearly outweighs the harm depends on the openness analysis, and the case is made or lost on the drawings showing the before and after footprint. The figures are illustrative.
Put the balance in the Planning Statement rather than scattering it across documents, and keep the openness figures consistent with the drawings. Enter your postcode on PlanScope to see which reports a Green Belt proposal is likely to need.
PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval. This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it.
Frequently asked questions
What does very special circumstances mean?
It is the test for approving inappropriate development in the Green Belt. Such circumstances do not exist unless the potential harm by reason of inappropriateness, together with any other harm, is clearly outweighed by other considerations. Substantial weight attaches to the Green Belt harm side of that balance.
Do the circumstances have to be rare or unusual?
No. The courts have held that considerations relied on need not themselves be rare or exceptional. What matters is whether, taken cumulatively, they clearly outweigh the harm, so a case built from several ordinary factors can succeed where each factor alone would not.
Is openness just about volume?
No. The Supreme Court has confirmed that openness has visual as well as spatial dimensions, so height, spread across the plot, hardstanding, lighting, activity and the visual effect from surrounding land all count. A replacement of equal volume can still reduce openness if it spreads rather than rises.
What is grey belt?
A category introduced by the December 2024 Framework covering Green Belt land that is previously developed or does not strongly contribute to specified Green Belt purposes, with associated conditions on affordable housing, infrastructure and green space. Check the current edition and guidance, because the definition and tests have been amended.
Which arguments usually fail?
The applicant's own financial position, a preference for a larger house, the fact that the site is screened by trees, and the presence of other development nearby. None of them engages the policy harm, so they do nothing to outweigh the substantial weight given to inappropriateness.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.