A ten-caravan residential site in South Gloucestershire has won an enforcement appeal after an Inspector found the land to be grey belt under the August 2026 NPPF.
The result is striking because the appellant first lost an important legal argument. An earlier permission for three mobile homes had not been lawfully commenced before it expired because a genuine contamination condition precedent had not been complied with in time.
But that did not decide ground (a). Looking at the development afresh against current planning policy, Inspector R Merrett found the previously developed Green Belt site qualified as grey belt, South Gloucestershire had only a 3.93-year housing land supply, and the ten-caravan scheme could be granted planning permission. The enforcement notice was quashed.
From three permitted mobile homes to a ten-caravan site
The site is land adjacent to Orchard Farm Cottage at Pomphrey Hill, Mangotsfield, near Bristol. South Gloucestershire Council issued an enforcement notice on 12th February 2026 concerning the residential caravan use, hardstanding and ground works and a building on the land.
By the time of the appeal the site contained nine static caravans, one large touring caravan and a utility building.
There was an earlier planning permission, reference P20/04560/F, granted on 15th July 2022 for three mobile homes with associated hardstanding and landscaping. That permission required development to begin by 15th July 2025.
The appellant argued that physical works carried out before that deadline had lawfully commenced the permission, leaving it extant. That argument mattered because, if correct, it would have changed the legal baseline for the enforcement appeal.
Why physical works did not keep the earlier permission alive
The Inspector accepted that physical operations capable in principle of amounting to commencement had taken place. The problem was condition 8, dealing with contamination.
Both sides ultimately accepted that this was a genuine condition precedent. In other words, compliance was legally required before the development authorised by the permission could be lawfully begun.
The Inspector considered the well-known Whitley principle. Planning permissions have to be read with their conditions, and operations carried out in breach of a true condition precedent will not normally amount to lawful implementation of the permission.
There is an important qualification. A later approval can sometimes validate earlier works where the relevant application for approval was made before the commencement deadline and the eventual approval shows the works complied with the condition. That did not rescue this permission.
The revised contamination submission which ultimately secured approval was made only after 15th July 2025. The condition was discharged on 27th October 2025, after the three-home permission had already expired. The council accepted that approving the condition after lapse had been an error.
The Inspector therefore found that the earlier permission had not been lawfully commenced in time. The appellant failed on the arguments that depended on the three-home permission remaining extant.
This is why the lesson is not simply that any pre-commencement condition prevents a material start. Planning Geek’s guide to making planning permission extant explains the distinction between ordinary conditions and true conditions precedent, and why the timing of discharge can be critical.
Ground (a) still had to be decided on current planning policy
Losing the lawful-commencement argument did not mean the enforcement appeal was over. Ground (a) asked whether planning permission should now be granted for the development enforced against.
That required the Inspector to assess the caravan site against the development plan and material considerations at the date of the appeal decision, including the August 2026 NPPF.
This is an important feature of enforcement appeal ground (a). A legal argument about the historic status of an older permission and the current planning merits are separate questions.
How grey belt became decisive
The site was in the Green Belt and was accepted to be previously developed land.
The Inspector then considered whether it strongly contributed to the Green Belt purposes relevant to the August 2026 definition of grey belt. Although Mangotsfield formed part of the wider Bristol built-up area, the site was contained by existing residential and recreational development, roads and planting.
On the particular physical and policy context, the Inspector found that the land did not strongly contribute to the relevant Green Belt purposes and could be treated as grey belt.
That classification did not itself make the development acceptable. The Inspector still had to work through the policy tests for development on grey belt land.
South Gloucestershire had a 3.93-year housing land supply
One of the key grey belt tests was unmet housing need. The parties agreed that South Gloucestershire could demonstrate only a 3.93-year housing land supply, equivalent to 7,029 dwellings and leaving a shortfall of roughly 1,900 homes against the required supply.
That meant unmet housing need was established for the purposes of the national grey belt policy.
The Inspector also found the location sustainable. The development would not fundamentally undermine the function of the remaining Green Belt across the plan area.
Planning Geek’s five-year housing land supply guide explains why a numerical shortfall can have consequences well beyond a simple housing monitoring exercise.
Why the Golden Rules did not apply to ten caravans
The appeal contains a particularly useful point on the Green Belt Golden Rules.
Under the August 2026 NPPF, the Golden Rules in policy GB8 apply to major development involving the provision of housing in the Green Belt. The Framework defines major housing development as development where 10 or more homes will be provided, or where the site has an area of 0.5 hectares or more.
There were ten caravans on this site, but the Inspector did not simply count ten caravans and stop there.
Nine were permanent static residential units. The tenth was a touring caravan pitch available for rent. The Inspector found that the touring pitch might or might not become a person’s permanent home and did not count it as a tenth permanent home for the major housing threshold.
The appeal site was also less than 0.5 hectares.
On those particular facts, the Inspector concluded that the scheme was not major housing development for the purposes of GB8 and the Golden Rules were not engaged. The council did not dispute that analysis.
This should not be turned into a general rule that touring caravans never count for planning thresholds. The point is narrower: the Inspector examined the nature of the actual accommodation before applying the definition rather than assuming every caravan or pitch was identical.
Caravan numbers and housing thresholds need careful analysis
The decision is therefore useful for anyone dealing with caravans and planning permission. Planning law often uses different tests for the use of land, the physical status of a caravan, the number of residential units and whether a proposal crosses a policy or statutory threshold.
Those questions should not be collapsed into a single headcount.
Here, the permission granted through the enforcement appeal allows no more than ten caravans on the land, of which no more than nine may be static caravans and one may be a touring caravan.
Retrospective development was not treated as punishment
The Inspector also considered the NPPF policy on intentional unauthorised development.
The appellant had proceeded on the mistaken belief that the earlier permission remained in place. There may have been intentional non-compliance with the limitations of the old three-home permission, but the Inspector did not equate that automatically with intentionally carrying out unauthorised development in order to evade planning control.
He also stressed the familiar point that planning enforcement is remedial rather than punitive. The planning merits still had to be assessed.
This does not excuse deliberate breaches. Where evidence shows intentional unauthorised development, national policy can require substantial weight to be given to that fact. It simply was not established on the evidence in this appeal in the way needed to carry adverse weight.
The enforcement notice was quashed and permission granted
Taking the current policy position as a whole, the Inspector found the scheme acceptable. The grey belt route was satisfied, the location was sustainable, visual and landscape effects were acceptable with controls, and contamination could be addressed by condition.
The housing benefit also carried significant weight, with the Inspector noting the prospect that the caravans would provide comparatively lower-cost rented accommodation.
The appeal succeeded on ground (a). The enforcement notice was quashed and planning permission was granted under section 177(5) of the Town and Country Planning Act 1990.
Conditions include the ten-caravan maximum, the split of no more than nine static caravans and one touring caravan, and a requirement for a compliance scheme to be submitted within three months.
A separate application for an award of costs against the council was refused. The Inspector found that shortcomings in the council’s handling did not amount to unreasonable behaviour causing unnecessary or wasted expense.
Four practical lessons from the grey belt appeal
- Conditions precedent can decide whether a permission was lawfully commenced. Physical works alone may not preserve a permission where a true condition precedent has not been complied with in the legally required way
- Grey belt can be relevant in an enforcement appeal. When ground (a) is before the Inspector, current development plan and national policy still have to be applied to the proposal
- The Golden Rules threshold matters. Whether housing development is major can materially change the Green Belt policy route
- Do not assume every caravan or touring pitch counts identically. The nature of the accommodation and the precise definition being applied matter
The South Gloucestershire decision brings all four issues together in one appeal. That makes it unusually valuable beyond the facts of this particular caravan site.
Read the appeal decision
The appeal is APP/P0119/C/26/3378284, concerning land adjacent to Orchard Farm Cottage, Pomphrey Hill, Mangotsfield, South Gloucestershire. The decision was issued on 4th September 2026.
Planning Geek hosts the appeal decision APP/P0119/C/26/3378284 and the separate costs decision in our own library. The Planning Inspectorate case page is retained as the external official source.
Created: 6th September 2026 | Grey belt
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