Grey belt is the category national policy created inside the green belt for land that contributes little to the green belt's purposes, previously developed land and other land that does not strongly serve the purposes of checking sprawl, preventing towns merging or preserving the setting of historic towns, and on which development is no longer treated as inappropriate provided the scheme meets the golden rules on affordable housing, infrastructure and access to green space. Green belt planning permission on land that is not grey belt remains the hardest case in the system, with inappropriate development refused unless very special circumstances outweigh the harm, so the first reading a developer makes on a green belt plot is whether it is grey belt, and the reading is made against the purposes rather than against a map, because there is no grey belt map: the authority reads each site, and until its plan says so the developer argues it. This page sets out grey belt as the developer reads it on a plot, and where green belt planning permission sits beside it.
The purposes, and the reading against them
Green belt has purposes the framework lists, and grey belt is land within it that does not strongly contribute to the first three: checking the unrestricted sprawl of large built-up areas, preventing neighbouring towns merging, and preserving the setting and special character of historic towns. Previously developed land in the green belt is grey belt by definition unless it is excluded; other land is read site by site, and a paddock on the edge of a village between two roads may qualify where a field that keeps two towns apart does not. The framework cited below states the definition, and the authority's plan and its green belt review, where it has one, are where the reading is tested.
The golden rules and what they cost a scheme
A grey belt scheme for housing must meet the golden rules: a set share of affordable housing above the local requirement, the necessary improvements to local or national infrastructure, and the provision of new or improved green spaces accessible to the public. Those are costs on the appraisal before the land value is read, and a developer who prices a grey belt plot on open-market values without them has priced the wrong scheme; the guide on the valuation of development land sets out where they sit in the residual.
Green belt that is not grey, and what the file keeps
On green belt land that does not qualify, development is inappropriate by definition except for the limited categories the framework lists, and permission needs very special circumstances that clearly outweigh the harm, which a small developer rarely has. The reading is therefore binary for the offer: grey belt and the golden rules, or green belt and no scheme. Curtilo Pro keeps the green belt boundary read from the authority's map, the grey belt argument and the purposes it rests on against the plot with the date, so the offer is built on the reading rather than the hope; the guidance cited below sets out the green belt regime.
Questions people ask about grey belt
Is there a grey belt map?
No. Grey belt is a definition applied site by site against the green belt purposes; authorities may identify it in plan reviews, and until then the developer argues it on the application. The green belt boundary itself is on the authority's proposals map.
Does previously developed land in the green belt count as grey belt?
By definition, yes, unless it is excluded by the other designations the framework names. Other land is read against the purposes.
Can I get green belt planning permission for a house on ordinary green belt?
Rarely: a new dwelling is inappropriate development unless it falls in a listed exception such as infill in a village or the replacement of an existing dwelling, and otherwise needs very special circumstances. The framework and the guidance cited below set out the categories.
Sources
- GOV.UK, National Planning Policy Framework: the grey belt definition, the golden rules and the presumption in favour of sustainable development
- GOV.UK planning practice guidance, Green Belt: its purposes, what counts as inappropriate development and how the boundaries are read
- GOV.UK planning practice guidance, When is permission required: development, permitted development rights, prior approval and article 4 directions