Listed building enforcement appeals concerning two converted barns in Buckinghamshire have failed after an Inspector found that cladding, doors and other alterations had caused substantial harm to their historic character.
Inspector Paul Freer dismissed linked appeals 3371929 and 3372035 on 28 October 2026 at Christmas Barn and a former cattle shed in Stoke Mandeville. Both listed building enforcement notices were upheld, although he corrected their references to the relevant statutory provision.
The case is an unusually detailed reminder that a listed building consent is not simply permission to achieve a broadly similar finished appearance. The approved drawings, written material approvals and particular conditions can determine exactly what may be changed during a conversion.
Why listed building enforcement reached two farm barns
The buildings, described in the decision as Barn 3 and Barn 2, were once part of a farmstead associated with Old Moat Farmhouse, a Grade II listed building dating from the sixteenth and seventeenth centuries. The Inspector treated both as curtilage listed buildings.
Barn 3 was a former threshing barn whose significance included its historic timber structure, threshing floor, steep roof and agricultural appearance. Barn 2 was a simpler former cattle shed, historically open sided and important to the enclosure of the farmyard.
The enforcement proceedings arose after their conversion and associated works. Barn 3 had received new oak weatherboarding instead of the required treatment and reinstatement of traditional boards. Its historic barn doors were replaced by a wider glazed opening. Barn 2 featured solar water heating panels, an added window, new doors and treated weatherboarding.
The difference between the two barns matters. An external finish appropriate to one historic agricultural structure was not automatically appropriate to the other. The Inspector considered their individual historic fabric, approved drawings and relationship with the farmhouse.
Approved plans, conditions and written agreements
The earlier consents were granted in 2012, with a revised scheme approved in March 2015. One of the disputed issues was whether an earlier annotated version of a barn drawing remained relevant when a later version appeared on the formal consent decision.
For Barn 3, condition 5 attached to the 2015 listed building consent specifically required weatherboarding to be repaired and replaced in accordance with drawing revision B. Although a subsequent revision H had also been identified, the Inspector found no conflict that removed the condition’s express requirements.
The conditions allowed deviations if Buckinghamshire Council agreed them in writing. The owner said contractors had tried unsuccessfully to reach officers by telephone when problems with existing boards arose. However, the replacement approach had never been submitted and agreed in writing.
The Inspector noted: Those conditions provided a mechanism to agree replacement weatherboarding with the written agreement of the Council.
In this case, the inability to reuse rotten boards did not excuse a departure from what the consent required.
Planning Geek’s guide to planning conditions explains why an express condition and its approved details must be read together. Heritage consents have their own statutory framework, but the practical lesson about written approvals is especially clear here.
Why the heritage harm was judged substantial
The former threshing barn had been approved for conversion on a basis intended to preserve its agricultural identity. Instead, the Inspector found that unstained oak boarding, loss of waney edged boards, removal of barn doors and enlarged glazing made it read as a domestic building.
Although its principal historic timber structure and steep roof survived, the external changes collectively altered its contribution to the historic farm group. Freer concluded that Barn 3 had become unrecognisable as a historic farm building, with harm to its own significance and to the setting of the Grade II listed farmhouse.
In reaching his decision, the Inspector assessed the harm to Barn 3’s significance as substantial. He also found substantial cumulative harm at Barn 2, where solar water heating panels, a new window, enclosed openings and oiled cladding eroded the former cattle shed’s simple agricultural appearance.
The Inspector was careful not to impose identical finishes on both buildings. Barn 3 historically had dark-stained boarding, whereas the evidence for Barn 2 did not establish that it had ever been clad in the same way. The required solutions reflected that distinction.
Neither case established that solar technology, replacement timber or glazing is automatically inappropriate for every listed building. These were conclusions about specific works, surviving significance and consents in this particular farmyard.
Why the notices survived the appeal grounds
The appellant challenged the two listed building enforcement notices on several grounds under section 39 of the Planning (Listed Buildings and Conservation Areas) Act 1990. One challenge argued that oiling timber was maintenance rather than ‘decoration’. The Inspector considered the notice sufficiently clear because it expressly referred to treatment ‘by oiling’.
Another point concerned the legislative basis for the remedial steps. The notices sought works that would bring the barns back into the condition required by existing consents. The Inspector therefore treated the disputed ground (j) arguments as ground (k) arguments about whether the steps exceeded what was necessary under section 38(2)(c), without causing injustice to either party.
The appeals also raised an important correction. The notices cited section 9(1), whereas Freer considered section 9(2), concerning non-compliance with consent conditions, the closer statutory fit. He corrected both notices rather than quashing them.
On the merits of retrospective listed building consent, Freer applied the heritage provisions in the August 2026 National Planning Policy Framework. He found no substantial public benefits to outweigh the harm, so consent should not be granted for the disputed works.
He also decided that the specified remedial works were necessary. The notices were upheld, subject to the statutory corrections, and the appeals failed. This was an Inspector’s decision on listed building enforcement, not a court judgment or a criminal conviction.
Why the passage of time did not settle the dispute
The converted barns had been substantially altered by 2015 and the owner said the works were finished by January 2016. Buckinghamshire received a complaint in December 2020, officers visited in 2022, and the enforcement notices were issued in July and August 2025.
The owner questioned whether action after that interval was expedient. The Inspector explained that a challenge to the authority’s decision to take enforcement action on expediency grounds belonged in judicial review, not in these listed building enforcement appeal grounds.
More fundamentally, listed building enforcement is not governed by the ordinary four-year or ten-year immunity periods familiar in general planning enforcement. Planning Geek’s listed building enforcement guidance explains why elapsed time alone cannot safely be treated as protection.
The distinction is critical for a purchaser or owner who discovers historic alterations. Old consent drawings, the conditions attached to them and subsequent written approvals may still matter many years after the building works were completed.
What listed building owners should learn
This listed building enforcement outcome is particularly relevant when defects are discovered mid-project. If original timber cannot be saved or a detail cannot be built exactly as approved, I would seek written agreement or further consent before assuming that an alternative is acceptable.
Approved plans should not be read in isolation from specific conditions. Here a condition referring to revision B remained operative even though a later revision H was also among the scheme drawings. The absence of a call-back from officers was not the written variation required.
For heritage professionals, the case also shows why description of ‘minor’ surface treatments needs care. Oiling timber, changing board profiles or filling an open bay can affect a building’s significance even if its structural frame remains unchanged.
The owner’s proposed result may seem sympathetic in general terms but still depart materially from the approved historic treatment. Planning Geek’s guidance on permitted development and listed buildings outlines the wider caution needed where protected fabric and heritage consents are involved.
Linked appeal decisions
The linked Planning Inspectorate appeal 3371929 and appeal 3372035 were decided together by Inspector Paul Freer on 28 October 2026. The appeal decision is also available on AppealBase.
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