A Class Q conversion of a Devon agricultural barn has won its planning appeal after an Inspector found that the building could be converted without substantial rebuilding. The decision, issued on 20 October 2026, grants prior approval for a single home at The Old Barn near Abbotskerswell, outside Newton Abbot.
Teignbridge District Council had rejected the scheme, disputing both the proposed building works and the design. Its original report and refusal notice also cited provisions concerning an extension, although no extension was proposed. Inspector C Cooper-Young examined the proposal as a change of use accompanied by the operations reasonably necessary to make the barn habitable.
For anyone considering an agricultural building, the Class Q conversion decision is useful because it looks at the actual condition of the structure, not simply whether the roof covering or individual walls require work. It also explains why an unresolved detailed drainage design does not necessarily defeat a prior approval application.
Why the Class Q conversion was refused
The application, reference 26/00579/NPA, sought to change the use of an existing agricultural building to one dwellinghouse. The building is a single-storey stone and cob structure with a small timber-framed lean-to and a corrugated metal roof. It is not a proposal to replace the entire barn with a newly built house.
Class Q of Part 3 of Schedule 2 to the General Permitted Development Order 2015 can authorise certain agricultural-to-residential changes of use, together with specified building operations. The right is subject to limitations, conditions and a prior approval procedure. It is not a blanket permission to knock down a barn and build a house on its footprint.
The Council objected that the works would go beyond a conversion, and also questioned the resulting design and external appearance. During the appeal, it was acknowledged that the refusal had incorrectly referred to Class Q provisions for an extension. The Inspector instead considered the scheme under the provisions appropriate to the non-extension proposal.
That distinction matters. The Class Q conversion was assessed against the building and operations actually submitted, not a different category of development inferred from the refusal notice. The Inspector also noted that the August 2026 revision of national planning policy did not materially alter the issues requiring determination.
Structural evidence separated conversion from rebuilding
A structural report by Ryall Structural Engineers was central. It found that the principal walls and main structural frame were sound, despite defects in the roof coverings and localised areas needing repair. The roof structure itself could be retained with repairs and alterations, without substantial new structural elements.
The report concluded that the building was capable of conversion with limited remedial works and without substantial rebuilding. Importantly, the Inspector said this description matched the condition seen during the site visit on 21 September 2026. The conclusion was therefore supported by both professional evidence and direct observation.
The proposed works included renewed roof covering and rooflights, internal insulation, new windows and doors, an exterior wall, a limecrete floor slab, lime render and stone facing, and rainwater goods. Those are significant works, but their scale alone does not answer the planning question. The central issue was whether the existing structure remained suitable for conversion.
The Inspector referred to government planning guidance and the High Court’s Hibbitt judgment, which addresses the distinction between conversion and effective rebuilding. The judgment does not create a simple percentage test for replacement materials. It requires a reasoned planning judgment about the actual building and works proposed.
On the facts of this Class Q conversion, the Inspector accepted that the works were reasonably necessary for residential use and permitted within the relevant Class Q provisions. That is a finding about this building supported by its survey, not a licence to replace every structurally unsound farm building.
Drainage details were not a Class Q prohibition
Teignbridge also raised the lack of a complete drainage scheme, including percolation testing and specification of a septic tank or treatment plant. The Inspector disagreed that this made the proposed change of use ineligible under Class Q. Necessary drainage and other services are expressly contemplated by the permitted development provisions.
The decision states that a full drainage design is not required at this prior approval stage and that other regulatory regimes will still govern the detailed arrangements. There was no compelling evidence that a satisfactory solution could not be achieved. The Class Q conversion therefore did not fail merely because all installation details had yet to be settled.
This should not be misunderstood as permission to discharge wastewater without the required consents. Applicants still need to establish an effective solution and comply with the relevant environmental and building requirements. The point is narrower: the Council had not shown that the missing final drainage design placed this proposal outside Class Q.
External appearance and countryside character
The site lies in a rural setting between Totnes Road, Manor Road and Firestone Lane. The Inspector noted that surrounding buildings, including houses roughly 200 metres away, vary substantially in design, materials and form. Replacement windows, roofing and finishes would undoubtedly change the barn’s appearance, but Class Q expressly anticipates appropriate alterations.
The conversion would preserve the overall form and shape of the existing barn. The Inspector found its external changes relatively simple and not unduly incongruous in the local setting. The proposed design and appearance were therefore acceptable for the purpose of the specific prior approval test.
A further safeguard remains relevant. The decision grants prior approval subject to the condition identified under Regulation 75 of the Conservation of Habitats and Species Regulations 2017. Its precise effect should be read alongside the original decision and the applicable regulations before any works begin.
What agricultural owners can learn from the appeal
The useful lesson from this Class Q conversion is evidential. A credible structural report identifying what can remain, what needs repair and why the result is a conversion can be more persuasive than a broad assertion that a building is capable of becoming a dwelling. The proposed drawings must tell the same story as the engineering evidence.
It is also worth distinguishing eligibility under the permitted development right from matters assessed through prior approval. An objection to appearance is not automatically an objection to whether a building can be converted. Nor is a council entitled to use an inapplicable extension restriction simply because the proposed works are substantial.
Planning Geek explains the current Class Q barn conversion rules, including the limitations that must be checked before a prior approval application, and the separate Paragraph W procedure. These are England-specific permitted development rules, not a general right across the UK.
The Class Q conversion at Abbotskerswell succeeded on its own engineering and design evidence. The original Planning Inspectorate appeal record, reference 6013251, should be read for the decision and its conditions. The decision is also available via AppealBase.
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