Nick Diment, Director, Head of Boyer London & South East discusses the Grey Belt. In a few years the most obvious sites will be used up: what next for large scale development?
Recent data indicates a rise in planning submissions on Green Belt land, reinforced by appeals outcomes and draft NPPF guidance. This suggests that the Green Belt will remain a central focus for development debates in the near term.
The emergence of Grey Belt marks a shift away from the traditional all-or-nothing approach to Green Belt land. By recognising that some areas hold limited environmental or strategic value, it creates political and practical space for housing (and employment) delivery while maintaining the broader appearance of protection.
However, land is in finite supply and whilst the concept of Grey Belt is welcomed, is only a temporary measure. It does not add new land but rather reclassifies it. Inevitably, the most viable opportunities will be exhausted, leaving urban densification, transit-led development, brownfield regeneration, and large new settlements as the ongoing strategies, each with their own challenges.
Limitations of the Grey Belt
In the short term, Grey Belt policy can and is helping unlock housing and employment by releasing the low hanging fruit, sites of lower quality and those which are less constrained.
But its impact can only be temporary. Once these sites are built out, the remaining land is likely to be more complex, constrained and costly to develop, leading to slowing delivery. In that sense, the Grey Belt may ultimately serve less as a solution and perhaps more of a distraction, postponing addressing the all too familiar challenges in the planning system.
Limitations of urban expansion
As outward growth becomes constrained, attention inevitably turns inward. Urban intensification (building more homes within existing settlements) has until relatively recently been presented as a key solution. There is certainly capacity for development on underutilised land and that which is currently low-density development.
However, intensification is not a cure all. It faces constraints ranging from infrastructure capacity and market absorption to local political resistance. Higher-density development can be particularly contentious in suburban areas, where character and amenity are fiercely defended. Moreover, not every location is equally suited to intensified development due to such issues as accessibly and viability, specifically the requirements of the Building Safety Act.
This is not to diminish its importance. Urban intensification has and should continue to play a key role in ensuring land is used efficiently if we are to move towards addressing the UK’s housing crisis. Yet due to the reasons above, it is unlikely to fully replace the need for strategic land release, especially in high-demand areas, unless delivering those urban sites is made easier.
Infrastructure
A persistent weakness in the planning system is the disconnect between land release infrastructure delivery. Development is often opportunity-driven, leaving infrastructure to be delivered piecemeal. This undermines both the sustainability of growth and its timing.
To improve outcomes, infrastructure planning must lead development rather than follow it. Planned investment in transport, energy, and connectivity should guide where and how growth occurs. Achieving this will require a proactive, coordinated role from central government and the new Combined Authorities, giving developers and communities the clarity and confidence to invest in well planned places. Without such a shift, the industry risks remaining reactive, pursuing individual sites rather than delivering coherent, large-scale growth.
Political will
The challenge beyond the Grey Belt is not a shortage of options, but a lack of political clarity and coordination. Mechanisms such as Green Belt review, new settlements, urban intensification and infrastructure-led planning already exist, but delivering them involves difficult trade offs: growth versus protection, local concerns versus national need, short-term pressures versus long-term strategy. The Grey Belt has been instrumental in kickstarting this debate and creating political space for action. Yet it is only a transitional tool, not a lasting solution. Within a few years, the most obvious Grey Belt sites will have been identified, allocated and hopefully, developed. Beyond that point, the pipeline will narrow forcing decisions on the tougher long overlooked urban brownfield sites.
The moment of reckoning
The Government promised to shake up the planning system and it has. Grey Belt has bought the system time but not provided a long-term answer. Once the easiest sites are developed the industry will be forced to confront choices it has of late deferred.
Addressing what comes next can’t be assigned to the ‘too hard’ to do pile or kicked down the road. It mustn’t be a temporary distraction. Now is precisely the time we should be looking at how to unlock those long term vacant urban brownfield sites that when delivered, can create truly sustainable communities where people can live, work and play. If this is not addressed now, we will repeat the same cycle: constrained supply, rising pressure, and increasingly difficult sites, all without a plan for growth.
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