Ad: Redundant Farm Buildings: A Guide to Class Q and Class R
Traditional barns and modern agricultural sheds are increasingly left behind by changing farming practices, yet they often represent one of a landowner's most underused assets.England's farms are full of buildings that no longer serve modern agriculture. Traditional barns and modern agricultural sheds are increasingly left behind by changing farming practices, yet they often represent one of a landowner's most underused assets. Two permitted development rights, Class Q and Class R, offer routes to bring these buildings back into productive use without a full planning application, provided strict criteria are met.
Class Q: From Barn to Home
Class Q allows agricultural buildings to be converted into residential dwellings, along with building works reasonably necessary to facilitate that conversion. It's one of the most widely used routes for delivering new rural homes, particularly through barn conversions. Within an established agricultural unit, up to 10 dwellings can be created, subject to a maximum cumulative floor area of 1,000 sqm, with no individual dwelling exceeding 150 sqm.
To qualify, a building must have been in agricultural use on or before 24 July 2023, or part of an established agricultural unit for at least 10 years. It must be structurally sound and capable of conversion without substantial rebuilding - a test that has generated significant case law and trips up many applications. It does not apply within National Landscapes, National Parks, Conservation Areas or World Heritage Sites, and excludes listed buildings, scheduled monuments, SSSIs and safety hazard zones. Where a tenancy exists, both landlord and tenant consent is required.
Class R: Beyond Housing, Into Commercial Use
Where residential conversion isn't the right fit, Class R offers an alternative. Agricultural buildings can change use to commercial purposes, including storage and distribution (B8), hotels (C1), Class E uses such as farm shops, cafés and offices, outdoor sport and recreation, agricultural training, and a restricted form of general industrial use for processing raw goods produced on-site.
Eligibility depends on the building having been used solely for agricultural purposes on or before 3 July 2012, or for at least 10 years before the application, with a floor area limit of 1,000 sqm per unit. Unlike Class Q, it's a change of use right only. No structural test applies, and external works aren't permitted. It also reaches into more sensitive landscapes than Class Q, including National Parks, though listed buildings and scheduled monuments remain excluded.
A Shared Process, Shared Pitfalls
Both rights operate through a Prior Approval process rather than a full application. LPAs have 56 days to decide, with approval deemed granted if no decision is issued in time, and development must complete within 3 years. In both cases, the LPA will scrutinise matters such as highway access, noise, contamination and flood risk.
Where Does the New NPPF Fit In?
The revised NPPF, published on 17 August 2026, doesn't change how Class Q or Class R operate - permitted development rights sit outside the Framework entirely. However, the new NPPF gives explicit policy support to converting existing buildings and diversifying agricultural businesses and now excludes agricultural buildings from the definition of "previously developed land". Worth bearing in mind if a Class Q conversion might be followed by further redevelopment down the line.
Getting It Right
While both routes offer a genuinely streamlined path to redevelopment compared with a full planning application, they are far from automatic. Demonstrating eligibility, navigating site-specific constraints, and presenting a robust case to the LPA all require careful preparation.
Not sure whether your buildings qualify? Get in touch with our planning team for a straightforward assessment - it could save effort on an application that was never going to succeed.
** Members can also get advice on planning issues from the CLA as part of their membership. **
About the author Dan Rogers is a Chartered Town Planner and a Partner at Bell Cornwell. He has particular expertise in environmentally sensitive and heritage locations across the South West. His work spans residential, commercial, tourism, agricultural and education developments, where he combines technical knowledge with a strong understanding of local Planning challenges.
Bell Cornwell is an independent town planning consultancy providing clear, realistic advice and a personalised service. We support landowners, developers and private clients nationwide, using expert knowledge, strong negotiation skills and commercial insight to navigate the planning system and secure the best possible outcomes. hello@bell-cornwell.co.uk / bell-cornwell.co.uk