The Hurst Green grey belt appeal concerned a 132-home housing scheme which cleared the new grey-belt policy route, yet the appeal was still dismissed. The decisive problem was not Green Belt policy. It was whether future residents could live acceptably next to Oxted Wastewater Treatment Works.
Appeal 6004144 is a useful warning against treating Policy GB7 as the finishing line. Wates Developments Ltd proposed up to 132 homes, including 50% affordable housing, on land south of Warren Lane. The Inspector found the site was grey belt and the proposal was not inappropriate Green Belt development, but the odour evidence left a fundamental uncertainty that the scheme could not safely pass over to a planning condition.
What was proposed at Hurst Green?
The outline application sought up to 132 dwellings, including 50% affordable housing, with vehicular access from Holland Road, pedestrian and cycle access from Holland Road and Warren Lane, public open space, landscaping, infrastructure, drainage works, earthworks and associated works. The proposal also referred to removal of the PLUTO pipeline, realignment of foul-water pipelines and grounding of power lines. All matters were reserved apart from access.
Tandridge District Council refused application 2025/613. The appeal was heard in June and July 2026 and dismissed by Inspector Jennifer Wallace on 17th September 2026.
The Green Belt argument largely went the appellant’s way
The appeal was considered under the August 2026 NPPF. The Inspector found that the appeal site fell within the Framework’s definition of grey belt because it did not strongly contribute to the relevant Green Belt purposes.
The remaining tests in Policy GB7(1)(g) were also satisfied. The site would not fundamentally undermine the purposes of the remaining Green Belt across the wider area, there was a clear unmet housing need, and the location was considered sustainable. The Inspector also took account of the requirements applying to major housing development, with the section 106 agreement securing affordable housing and other measures.
The result was important: the proposal was not inappropriate development in the Green Belt. It did not therefore fail because of the traditional Green Belt test or because the scheme had not shown very special circumstances.
This is the first practitioner lesson from the appeal. Grey belt can solve a Green Belt policy problem, but it does not disapply the rest of the development-management exercise.
Heritage harm was also outweighed
The nearby Grade II listed Jincox Farm House is a 16th-century timber-framed building. The Inspector found that the openness and historic separation between the farmhouse and the settlement helped the ability to appreciate its significance.
Housing on the appeal site would reduce that appreciation, but the harm was assessed at the very lowest level. The public benefits of up to 132 homes, including 50% affordable housing, together with the other benefits of the scheme, clearly outweighed that heritage harm.
Heritage was therefore not the reason for dismissal either.
Wastewater capacity and odour were different questions
The critical issue arose from the site’s proximity to Oxted Wastewater Treatment Works.
It is important not to muddle two separate questions. The first was whether the sewerage network and treatment works had capacity to serve the development. The Inspector was satisfied on the evidence before her that wastewater disposal and capacity could be addressed.
The second question was whether people living on the new estate would experience unacceptable odour from an existing operational treatment works. That was a residential-amenity issue, not simply an infrastructure-capacity issue.
Southern Water’s consultation response advised against residential development within 500 metres of the works. The decision records that Southern Water’s odour consultant had subsequently reached an understanding that development within the 3.0 ouE/m³ contour would be acceptable. However, that was not Southern Water’s own position. Southern Water maintained that levels above 1.5 ouE/m³ would have a harmful effect on the living conditions of occupiers. Read alongside the appellant’s own assessment, that left the Inspector unable to conclude that acceptable conditions had been demonstrated within the affected areas.
The submitted odour model no longer matched the likely upgrade
The appellant had submitted an odour assessment which modelled the treatment works on the basis of a proposed upgrade. That assessment identified areas affected by the 1.5 to 3.0 and 3.0 to 5.0 ouE/m³ contours.
The difficulty was that the modelled upgrade had not taken place. A different upgrade was then being proposed for the treatment works, and details of those new works were not publicly available. The Inspector therefore considered that the submitted model was no longer likely to represent the future scenario against which the housing should be assessed.
The decision letter does not identify the engineering specification of the upgrade assumed in the appellant’s model or the technical differences in the replacement proposal. Planning Geek has therefore not filled that gap with speculation. The useful point is narrower and stronger: where an assessment depends on future infrastructure works, the evidence needs to relate to the works actually proposed or to a scenario that is sufficiently certain to rely upon.
Why the uncertainty mattered to all 132 homes
The Inspector was not satisfied that acceptable living conditions had been demonstrated within the relevant odour contours. She also had to consider whether the parts of the site outside those areas could still accommodate the full number of homes sought.
Because of the amount of land affected and the other layout constraints, there was insufficient certainty that up to 132 dwellings could be accommodated while avoiding unacceptable odour effects.
That point mattered when the appellant suggested a planning condition. The Inspector said this would itself be the planning permission and she could not impose a condition which might prevent the quantum of development sought from being implemented. In other words, a condition could not be used to sidestep the unresolved question of whether the permission for up to 132 homes was capable of being delivered acceptably. Our guide to planning conditions explains the familiar tests that a condition must satisfy.
The Framework’s policy on new development next to existing activities also matters here. Policy P4 expressly identifies the applicant as the agent of change where an existing activity could have a significant adverse effect on a proposed new development nearby. The Inspector expressly applied Policy P4. In practical terms, the new housing had to demonstrate that it could be integrated with the existing wastewater-treatment operation and that suitable mitigation could be provided.
The final planning balance
Tandridge had only about a two-year housing land supply and its latest Housing Delivery Test result was 38%. The Inspector gave substantial weight to the provision of market and affordable housing and recognised the other economic, open-space, biodiversity and transport benefits.
Those benefits were not enough. The unresolved odour issue went directly to the living conditions of future residents and to whether the development quantum sought could be accommodated. The adverse effect therefore substantially outweighed the benefits in the overall planning balance.
Appeal 6004144 was dismissed.
What does the Hurst Green appeal teach?
- Passing Policy GB7 does not remove other development-management considerations
- Wastewater capacity and odour effects are separate planning questions
- Future infrastructure relied upon in technical evidence needs to match what is actually proposed or reasonably certain to happen
- A condition cannot always cure uncertainty about whether the development sought is capable of being accommodated acceptably
- Grey belt is a policy route, not a planning permission in its own right
Read the full Hurst Green appeal decision hosted by Planning Geek.
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