Permitted development rights let certain building works and changes of use happen without a full planning application, through a lighter-touch process called prior approval. This guide covers what Class MA and Class Q actually allow since their recent reforms, how prior approval genuinely differs from full planning, and the single check that catches out more investors than any other factor.
Figures below reflect the General Permitted Development Order as amended, current to mid-2026, and apply to England specifically; Scotland, Wales, and Northern Ireland operate separate planning systems. This is general education, not planning or legal advice; always verify a specific property's position with the local planning authority or a planning consultant before committing capital.
- Prior approval versus full planning permission
- Class MA: commercial to residential
- Class Q: agricultural to residential
- The check that catches out more investors than anything else
- Where permitted development never applies, regardless
- When you genuinely need full planning permission
- Frequently asked questions
1. Prior approval versus full planning permission
2. Class MA: commercial to residential
Class MA allows most commercial buildings in Use Class E, offices, retail, gyms, nurseries, and medical premises among them, to change use to residential without a full planning application, subject to prior approval. It replaced the older, narrower Class O (office-only) in 2021, and was substantially widened by reforms taking effect 5 March 2024.
Before March 2024, Class MA was capped at 1,500 square metres of floorspace and required the building to have stood vacant for at least three months beforehand. Both restrictions were removed for applications submitted on or after that date: there's now no upper size limit on the floorspace convertible under Class MA, and no prior-vacancy requirement at all. The building must still have been in genuine Class E use for a continuous period of at least two years before the application.
The prior approval fee for Class MA is £100 per dwelling created, genuinely modest compared with the cost of a full planning application on an equivalent scheme.
3. Class Q: agricultural to residential
Class Q permits converting agricultural buildings to residential use, up to five dwellings, capped at a combined 465 square metres of total floor space, again subject to prior approval rather than full planning permission. The building must have genuinely been in agricultural use by a specific qualifying date, and the works involved must be "reasonably necessary" for the conversion, meaning the existing structure is adapted rather than substantially rebuilt or demolished and replaced.
4. The check that catches out more investors than anything else
A local authority can remove Class MA, Class Q, or other permitted development rights from a specific area entirely through an Article 4 Direction, our HMO Outlook covers how the same mechanism has become widespread for HMO conversions specifically. This is widely cited as the single factor that catches out more investors than any other: a building can genuinely satisfy the Class MA use, floorspace, and duration tests, and still require full planning permission purely because of where it happens to sit. Always check the specific local authority's Article 4 register for the property's exact location before relying on Class MA in any appraisal or funding application.
5. Where permitted development never applies, regardless
- Listed buildings, and land within their curtilage, regardless of current use or condition.
- Scheduled monuments.
- Safety hazard areas and military explosives storage areas.
- Sites of Special Scientific Interest.
- Conservation areas don't automatically remove Class MA rights, but the prior approval assessment of design and external appearance is applied considerably more rigorously, and significant external alterations can still be refused on those specific grounds.
6. When you genuinely need full planning permission
Beyond the specific exclusions above, full planning permission remains necessary for new-build development, most extensions and alterations beyond the standard permitted development thresholds for a single dwelling, and any change of use that doesn't fall within an existing permitted development class. Getting an early, informal read from the local planning authority, or engaging a planning consultant to review a specific site before committing capital, is genuinely worth the modest upfront cost given how much a scheme's viability can hinge on which route actually applies.
7. Frequently asked questions
What is Class MA permitted development?
Class MA is a permitted development right allowing most commercial buildings in Use Class E, including offices, retail, gyms, nurseries and medical premises, to change use to residential without a full planning application, subject to prior approval from the local planning authority. Reforms in March 2024 removed the previous 1,500 square metre floorspace cap, so there is now no upper size limit.
What's the difference between prior approval and full planning permission?
Prior approval only assesses a specific, narrower list of matters, such as flooding, contamination, transport impact, and adequate natural light, rather than the full planning merits of the scheme. It's generally faster and cheaper, with a 56-day decision window, after which approval is deemed granted if the council hasn't responded, compared with a full planning application's broader and often slower assessment.
Can an Article 4 Direction remove my permitted development rights?
Yes. A local authority can use an Article 4 Direction to remove Class MA, or other permitted development rights, in a specific area, requiring full planning permission instead. This is widely cited as the single factor that catches out investors most often, since a building can pass every other Class MA test and still require full planning purely because of where it sits.
Do listed buildings qualify for Class MA conversion?
No. Class MA does not apply to listed buildings or land within their curtilage, regardless of the building's current use or condition. Any conversion of a listed building requires listed building consent and full planning permission instead.
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