Published: 2nd October 2025
Area: Grey Belt
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Grey Belt – A Game Changer for Planning and Housing
Planning | Report
Unlocking Sustainable Development Opportunities in the Green Belt
What’s Inside the Report?
- A breakdown of the grey belt policy and its implications for planning and housing.
- How to identify grey belt land and build a robust case for development.
- Lessons from major residential planning appeals—what worked and what didn’t.
- Key considerations for our clients navigating the evolving planning landscape.
- Expert recommendations for leveraging grey belt opportunities.
Why Grey Belt Matters
- 80% of major residential grey belt appeals have been approved—signalling a major shift in planning outcomes.
- 1,600 new homes have been allowed on grey belt via planning appeals.
- The policy is helping to streamline planning processes, increase certainty, and support sustainable growth.
- Grey belt land is now central to tackling housing affordability and delivering infrastructure and open space through the Golden Rules.
Download the Full Report
Ready to explore how grey belt policy can unlock new development potential?
Complete the form below to access your free copy of Grey Belt: A Game Changer for Planning and Housing. Discover how this landmark policy is reshaping planning decisions and creating new pathways for sustainable development in the Green Belt.
Our Services
Marrons is a multi-service development consultancy backed by the experience of working for local authorities, extensive market intel and connections across the industry.
About Marrons
Marrons is a multi-service development consultancy backed by the experience of working for local authorities, extensive market intel and connections across the industry - from planning offices and private landowners to housebuilders and retailers.
With expertise in Planning, Architecture, Design, Heritage and Economic Development, you can trust us to lead, protect and enhance the value of your land or building assets ensuring we turn your plans into reality.
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We act on behalf of a range of clients across the UK to deliver economic, social and environmental regeneration. Our specialists are here you turn your vision into reality.
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Our Areas of Expertise
Planning
Whether you are looking for advice on an appeal for a major development scheme, or putting in an application for a house extension, we can help you navigate the best way forward.
Architecture
Led by RIBA Chartered Architects, our Architects have wide-ranging experience in handling large scale projects through multi-disciplinary teams, often acting as project co-ordinators and design team leaders.
Design
Our urban design team have a wealth of experience in both large scale urban development and detailed design and can help you make the most out of your land and provide a clear vision for your development.
Heritage
Our heritage team proudly advocate for the role of heritage in sustainable place-shaping, and champion the value that heritage assets can bring to developments.
Economic Development
Our specialist team works with you to provide evidence that your land or planning development has commercial benefits, and positively impacts socio-economics in the wider community.