The golden rules for major green belt development
What the golden rules require of major development on released green belt land, how the affordable housing cap works, and why land price is not a viability answer.
Where major housing development involves land released from the Green Belt, national policy attaches three conditions to it. An affordable housing contribution set at 15 percentage points above whatever requirement would otherwise apply, capped at 50 per cent. Necessary improvements to local or national infrastructure. And new or improved green space that the public can actually reach. Those are the golden rules for green belt development, and a scheme that fails them is in a much weaker position than one that meets them, because meeting them is part of what stops the development being treated as inappropriate in the Green Belt.
The rules arrived with the December 2024 Framework and carry forward into the current edition, published on 17 August 2026, where Green Belt policy sits in a coded chapter rather than numbered paragraphs. Check the policy code in the live document on gov.uk before you cite it in a submission, because the renumbering caught out a lot of statements drafted against older copies.
What the rules require of a major scheme
The rules apply to major development, which for these purposes follows the usual definition of ten or more dwellings, a site of half a hectare or more where the number of units is unknown, or 1,000 square metres of floorspace.
They apply to land released through plan-making and to land released or developed through decision-taking, including the grey belt category introduced alongside them. So a developer promoting a site in a draft local plan and a developer applying for permission on previously developed green belt land are both in scope, with different evidence needs.
The rules are cumulative. There is no hierarchy that lets a scheme trade a stronger infrastructure package against a weaker affordable offer. An application that meets two of the three invites a refusal reason on the third.
The affordable housing uplift and the cap
The arithmetic is simple once you identify the baseline. Take the highest affordable housing requirement that would otherwise apply to the development, which is normally the adopted local plan policy figure, add 15 percentage points, and apply a cap of 50 per cent.
| Local plan requirement | Golden rules figure |
|---|---|
| 20 per cent | 35 per cent |
| 30 per cent | 45 per cent |
| 35 per cent | 50 per cent, after the cap |
| 40 per cent | 50 per cent, after the cap |
Two complications come up repeatedly. The first is identifying the baseline where the plan sets different figures by site size or by location, or where a supplementary document varies the plan figure. Take the highest requirement that would apply to the development in question rather than the borough-wide headline. The second is tenure split, which the golden rules do not prescribe, so the adopted plan's tenure policy continues to govern the mix of social rent, affordable rent and intermediate products. Get the tenure position agreed in heads of terms early, because a 50 per cent offer weighted towards shared ownership is a different scheme from one weighted towards social rent, and registered providers will tell you which they will take.
Set the figure out clearly in the Affordable Housing Statement, with the baseline policy quoted, the arithmetic shown and the tenure split stated unit by unit.
Infrastructure expectations
The infrastructure limb is the least prescriptive and the most variable in practice. National policy asks for necessary improvements to local or national infrastructure, which in substance means the scheme must address the capacity consequences of the development it creates.
In practice the evidence base is the familiar one. Education capacity from the county or unitary authority's pupil forecasts. Primary care capacity from the integrated care board. Highway and public transport capacity from the transport assessment, including any strategic road network interest. Utilities capacity from the distribution network operator and the water undertaker.
What the rules change is the framing. Contributions still have to satisfy the statutory tests for planning obligations, so an authority cannot use the golden rules to justify a contribution that fails those tests. But an applicant who has not identified the infrastructure consequences of its own scheme cannot show the limb is met, and silence is read as a failure rather than as an absence of need.
Accessible green space provision
The third limb asks for new green space, or improvements to existing green space, that is accessible to the public. The policy intent is that people living in a scheme built on released green belt land can reach good quality green space without getting in a car.
Build the case on a standard rather than on assertion. National green infrastructure standards give a framework for accessible green space provision by distance and size, and an authority with its own open space standards will expect those to be addressed as well. Map what exists within walking distance, identify the deficiency, and show how the scheme fixes it.
Three practical points decide whether this limb is accepted. Whether the space is open to the public in fact, with an access route that does not cross private land. Whether it is laid out as usable space rather than as leftover land around attenuation basins. And who maintains it, which means a management company or a transfer to the authority with a commuted sum, secured in the agreement. Biodiversity obligations interact here, since land used for off-site habitat creation may not be freely accessible, and how irreplaceable habitats sit outside the biodiversity gain regime is worth checking before you double-count a parcel.
Viability and whether the rules bend
They bend less than developers hope. National policy makes clear that the price paid for land is not a justification for failing to meet the rules, and the viability guidance in the Planning Practice Guidance continues to apply, including the approach to benchmark land value based on existing use value plus a premium.
The practical consequence is that a land value which already assumes green belt release at a residential price cannot then be used to argue that the affordable housing figure is unaffordable. That argument reverses the policy. Where a real viability case exists, for example on a site with abnormal remediation or access costs, it has to be built from the existing use value upwards and tested openly, with the appraisal published as part of the application.
Expect a review mechanism. Authorities commonly require an early-stage and a late-stage review where a scheme is permitted below policy compliance, and on a green belt release scheme the late-stage review is likely to be drafted tightly.
Evidence and the section 106 drafting
Four documents carry the weight. The affordable housing statement with the arithmetic. The infrastructure position, usually within the planning statement with the technical reports behind it. The green space strategy, within the landscape and open space material. And the heads of terms, which is where the three limbs become enforceable.
Draft the heads of terms against the limbs explicitly, with a clause for each. Authorities and inspectors find it much easier to conclude that the rules are met where the agreement is structured the same way the policy is. Keep the triggers aligned with the phasing, since green space delivered after the last occupation of a phase is a frequent cause of argument.
Plan-making routes need a different package again, with the site's contribution tested through the examination rather than at application stage, and what happens to emerging plans under the reform programme affects how quickly that route delivers.
Which edition of the Framework to cite
Cite the current edition and say which one it is. The Framework was reissued in December 2024, which is when the golden rules and the grey belt category first appeared, and again on 17 August 2026, when the paragraph numbering was replaced by policy codes organised by chapter, with Green Belt policies in the GB series.
A submission that cites a December 2023 paragraph number for green belt policy signals that the author has not opened the current document, and an officer will say so. Verify the policy code and the wording on gov.uk on the day you finalise the statement, and record the edition date in the citation. The position described here is as at the 17 August 2026 edition. Reform continues, and the planning law timeline is where to follow changes as they are made.
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, so check the position with your local planning authority or a qualified professional before relying on it. Enter your postcode on PlanScope to see which reports your site is likely to need.
Frequently asked questions
How is the affordable housing figure calculated?
Take the highest affordable housing requirement that would otherwise apply to the development, normally the adopted local plan figure for that site, add 15 percentage points, and apply a cap of 50 per cent. So a 30 per cent policy becomes 45 per cent, and any policy of 35 per cent or above lands on the 50 per cent cap.
Do the golden rules set the tenure split?
No. The rules fix the quantum of affordable housing, and the adopted local plan's tenure policy continues to govern the mix of social rent, affordable rent and intermediate products. Agree tenure in heads of terms early, because a provider's willingness to take the units depends heavily on the split rather than on the headline percentage.
Can viability reduce the affordable housing requirement?
Only on a properly evidenced case. National policy is clear that the price paid for land does not justify failing to meet the rules, and benchmark land value follows the existing use value plus a premium approach in guidance. A land price that already assumes residential value after release cannot be used to argue the figure is unaffordable.
What makes green space count as accessible?
Public access without crossing private land, a layout that is usable rather than leftover space around drainage features, and a secured maintenance arrangement through a management company or transfer with a commuted sum. Build the case against national green infrastructure standards and the authority's own open space standards rather than on assertion.
Which Framework edition should a submission cite?
The current one, stated by edition. The golden rules appeared in the December 2024 Framework, and the Framework was reissued on 17 August 2026 with policy codes replacing paragraph numbers, Green Belt policies sitting in the GB series. Verify the code and wording on gov.uk on the day you finalise the statement.
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.