How Are Green Belt Boundaries Changed?
How Are Green Belt Boundaries Changed? Understand the Green Belt permanence principle, boundary changes, exceptional circumstances and the December 2024 NPPF rules on Green Belt review.
GREEN BELTPLANNING POLICY
Andrew Ransome
7/10/20264 min read
Green Belt boundaries are not fixed in perpetuity. They can be altered — but only through the development plan process.
The December 2024 NPPF has significantly strengthened the obligation on local planning authorities to review Green Belt where they cannot otherwise meet their housing and development needs, while maintaining the principle that boundaries should only be altered where exceptional circumstances are fully evidenced and justified.
This article explains the process, the tests that apply, and what the 2024 changes mean in practice.
The Green Belt 'Permanence' Principle
Paragraph 142 of the NPPF states that the fundamental aim of Green Belt policy is to prevent urban sprawl by keeping land permanently open.
Permanence is one of two essential characteristics of the Green Belt.
Paragraph 145 provides that once established, Green Belt boundaries should only be altered where exceptional circumstances are fully evidenced and justified through the preparation or updating of plans.
A critical procedural consequence follows:
Green Belt boundaries cannot be altered through individual planning applications or appeal decisions.
Permission can be granted for development on Green Belt land through Very Special Circumstances or a paragraph 154 exception — but the land remains designated Green Belt.
Actual boundary alteration can only happen through the development plan process, subject to examination by a Planning Inspector.
The Exceptional Circumstances Test
Paragraph 146 of the December 2024 NPPF states that exceptional circumstances include, but are not limited to, instances where an local planning authority cannot meet its identified need for homes, commercial or other development through other means.
Where that is the case, authorities should review their Green Belt boundaries and propose alterations to meet these needs in full, unless doing so would fundamentally undermine the purposes of the remaining Green Belt across the area of the plan.
The High Court confirmed that an Inspector has wide discretion in finding exceptional circumstances, and that these need not be individually exceptional. They can be broad and strategic, including housing supply headroom above objectively assessed need.
The December 2024 Obligation to Review
One of the most significant changes in the December 2024 NPPF is the explicit obligation to review Green Belt boundaries where development needs cannot be met through other means, unless doing so would fundamentally undermine the purposes of the remaining Green Belt.
Before concluding that exceptional circumstances exist, paragraph 147 requires the authority to demonstrate it has examined all other reasonable options: making maximum use of brownfield sites; optimising density in accessible locations; and discussing with neighbouring authorities whether they could accommodate some of the need.
The Sequential Approach to Release
Paragraph 148 establishes a sequential hierarchy for Green Belt release in plan-making.
Plans should give priority to:
previously developed land;
then grey belt not previously developed;
then other Green Belt locations.
The need to promote sustainable patterns of development is emphasised in the NPPF.
The NPPF also states that Green Belt land distant from services and public transport should not be released in preference to more sustainably located brownfield or grey belt land.
Safeguarded Land
Paragraph 149(c) allows for the identification of safeguarded land: areas between the urban area and the Green Belt identified to meet longer-term development needs stretching beyond the plan period.
Safeguarded land is not allocated for development at the present time — permission can only be granted following a future plan update.
For landowners, safeguarded status represents significant long-term planning gain: the Green Belt constraint is removed, but the timing of development remains subject to a future plan review.
Villages and the Inset/Washed-Over Question
Paragraph 150 of the NPPF addresses villages.
Where restriction of development is necessary, primarily because of the village's contribution to the openness of the Green Belt, it should be included in the Green Belt.
Where protection is needed for other reasons — historic character, landscape setting — other designations should be used and the village excluded.
Whether a village is inset from or washed over by the Green Belt is determined at plan-making stage, and has significant consequences for individual landowners within or adjacent to those settlements.
Green Belt Boundary Changes - Summary
Green Belt boundaries can only be altered through the development plan process, on the basis of exceptional circumstances fully evidenced and justified.
The December 2024 NPPF strengthens the obligation to review where housing needs cannot be met otherwise, and establishes a sequential hierarchy prioritising PDL, then grey belt, then other Green Belt land.
Green Belt assessments must address both spatial and visual dimensions of openness.
Safeguarded land provides a mechanism for longer-term release.
For landowners promoting sites, early engagement in the local plan process and a robust evidence base demonstrating weak contribution to Green Belt purposes is the foundation of any successful promotion.
Planning Application Advice
If you own land or a building in the Green Belt and want to understand your development options, I can advise on planning strategy and manage your application from initial assessment through to decision. Contact me to discuss your site.
Andrew Ransome MRTPI - Email: andrew@andrewransome.co.uk
About me
Andrew Ransome is a Planning Director and a Chartered Member of the Royal Town Planning Institute (RTPI), with more than two decades of experience in town planning.
He specialises in delivering strategic planning solutions for complex developments across both rural and urban environments, helping clients navigate planning challenges and unlock development opportunities. Connect with Andrew on Linkedin.
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Get in touch for planning advice: Email: andrew@andrewransome.co.uk
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