Class Q and Class MA After 2024: Permitted Development for New Homes in England
The 2024 amendments materially widened two of England's most useful permitted development rights: Class Q for agricultural buildings and Class MA for commercial Class E premises. This explainer sets out the figures now in force, the prior-approval matters and excluded locations that still bite, and the commercial and tax questions we tell developers to settle before they exchange rather than after.
Why these two rights matter to developers
Permitted development rights let certain changes of use proceed without a full planning application, subject instead to a lighter prior-approval process. For anyone creating homes in England, two rights dominate: Class Q, which converts agricultural buildings into dwellinghouses, and Class MA, which converts commercial premises in Use Class E into dwellinghouses. Both were widened significantly in 2024, and both are frequently misunderstood because online guidance still quotes the pre-2024 figures. The purpose of this article is to state the rules now in force, verified against legislation.gov.uk and the relevant amendment orders, and to flag the commercial and tax points GX Tax Partners raises with clients before they commit to a purchase. A permitted development right does not remove the need for building regulations approval, and it does not override restrictive covenants, ransom strips or overage obligations attached to the land.
Class Q now: more homes, more floorspace
Following the amendment order that came into force on 21 May 2024 (SI 2024/579), Class Q permits up to 10 dwellinghouses within an established agricultural unit, up from the previous maximum of five. The total floorspace that can be converted rose from 865 square metres to 1,000 square metres, and there is now a separate cap of 150 square metres on any single dwelling created under the right. The former split between a small number of larger homes and a larger number of smaller homes has gone; the position is now a straightforward ceiling of 10 units, 1,000 square metres in total, and 150 square metres each. A building qualifies where it was used solely for agriculture as part of an established agricultural unit on 24 July 2023, but a building that became part of the unit after that date is not permanently excluded: it can still qualify once it has been part of that established agricultural unit for at least 10 years before development begins. The 2024 changes also introduced a requirement that the building has suitable existing access to a public highway.
Class Q prior approval and the places it does not reach
Class Q is not planning-permission-free; it requires prior approval from the local planning authority, which will assess matters including transport and highways, contamination, flooding, noise, whether the location or siting makes residential use impractical, the design and external appearance where building operations are involved, and the provision of adequate natural light to all habitable rooms. Development must be completed within three years of the prior-approval date. Critically, Class Q is excluded entirely on Article 2(3) land, which covers National Parks, National Landscapes (the designation formerly called Areas of Outstanding Natural Beauty), conservation areas, the Broads and World Heritage Sites. It is also unavailable on sites of special scientific interest, safety hazard areas, military explosives storage areas, scheduled monuments, and where the building is itself a listed building. A barn that looks like an obvious conversion candidate can be ruled out by a single designation, so the location check must come first, not last.
Class MA now: the cap and the vacancy rule have gone
Class MA converts premises in Use Class E, which spans shops, offices, restaurants, cafes, gyms, nurseries, clinics and similar uses, into dwellinghouses. It was introduced on 1 August 2021 with two features that constrained larger schemes: a 1,500 square metre limit on the floorspace that could be converted, and a condition that the premises had been vacant for a continuous period of at least three months before the application for prior approval. For applications submitted on or after 5 March 2024, both of those restrictions were removed. There is now no floorspace ceiling on a Class MA conversion, and there is no requirement to demonstrate any period of vacancy. This is a genuine expansion: a fully occupied commercial building of any size can now, in principle, be brought forward for conversion, which changes the arithmetic on larger office and retail assets that previously fell outside the right.
What Class MA still requires
The relaxations did not turn Class MA into a free pass. The building must have been in a qualifying Use Class E use for a continuous period of at least two years before the date of the prior-approval application, so a recently changed use will not qualify. Prior approval is still needed, and the authority will consider transport and access, contamination, flooding, noise affecting future residents, the provision of adequate natural light to habitable rooms, the impact on a conservation area where relevant, the loss of registered nursery or health-centre services, and fire safety in larger buildings. Class MA remains unavailable on listed buildings and their curtilage, scheduled monuments, sites of special scientific interest, safety hazard and military explosives areas, and on Article 2(3) land such as National Parks and National Landscapes, though it can apply within conservation areas subject to the additional prior-approval test. Development must be completed within three years of prior approval. As with Class Q, the widened numbers make the scheme more attractive but do not shorten the diligence list.
The commercial and tax questions to settle before exchange
A viable permitted development right raises the value of a site, and that is precisely why the commercial terms need attention before exchange. Ransom strips are the first check: if a narrow strip of land controlling the only access to the highway is in third-party ownership, the conversion right is worthless until that strip is secured, and the strip owner knows it. Overage clauses are the second: many agricultural and commercial sites are sold subject to a clawback giving the former owner a share of any uplift once residential use is achieved, and a poorly reviewed overage deed can strip out much of the profit the Class Q or Class MA right appears to create. The tax angle we press hardest is capital allowances. Plant and machinery allowances are generally not available on the completed dwellinghouses themselves because of the long-standing exclusion for private dwelling-houses, and structures and buildings allowance is likewise unavailable on residential use, so a conversion appraisal that assumes allowances on the finished homes is usually wrong. Where a scheme is genuinely mixed, retaining a commercial element or qualifying communal areas, some relief may survive, and any pre-conversion expenditure on a building held for a qualifying use should be reviewed on its own facts. These are points to model at appraisal, not to discover after completion. This is general information and not advice on a specific transaction; a worked figure such as an assumed overage share is illustrative only.
Short FAQ
How many homes can I create from a barn under Class Q now? Up to 10 dwellinghouses within an established agricultural unit, with a total of 1,000 square metres and no single dwelling exceeding 150 square metres, under the rules in force since 21 May 2024. Does a commercial building still have to be empty before a Class MA conversion? No. For applications made on or after 5 March 2024 the three-month vacancy condition was removed, and there is no longer any floorspace cap either, though the building must have been in Class E use for at least two years. Can I use these rights in a National Park or a National Landscape? No. Both Class Q and Class MA are excluded on Article 2(3) land, which includes National Parks and National Landscapes, so a full planning application would be required there.
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This article is general information only and does not constitute tax advice. Figures and dates are current as at the date of writing; any worked example is illustrative. Always consult a qualified adviser before acting.