Class MA office to residential: the prior approval evidence
Class MA turns Class E buildings into homes without a full application, but only if the prior approval submission answers the Order's fixed list of matters. Here is the evidence councils expect and the traps that cause refusals.
Class MA lets a building in Class E become homes in Class C3 without a full planning application, but only after the council has given prior approval on a fixed list of matters. Class MA prior approval is not a formality and it is not a planning application either. The council can only refuse on the grounds the Order gives it, so an application that answers each of those grounds with evidence, in order, is very hard to turn down. One that reads like a planning statement usually gets refused for missing a required document.
What Class MA permits and where it does not apply
Class MA sits in Part 3 of Schedule 2 to the General Permitted Development Order 2015 and was introduced on 1 August 2021. It permits development consisting of a change of use from Class E, commercial, business and service, to Class C3, dwellinghouses.
The exclusions matter more than the permission. Class MA is not available where the building is listed or in the curtilage of a listed building, where it is a scheduled monument, where the land is a site of special scientific interest, a safety hazard area or a military explosives storage area. Buildings in conservation areas are within Class MA, with an extra prior approval matter attached about the loss of the ground floor use.
The right applies to the building's use, not to its condition. Class MA gives no permission for external works. New windows, a new entrance, balconies, bin and cycle stores and any change to the roof all need separate permission, and forgetting that is why so many Class MA schemes end up submitting a second application halfway through the build.
The two-year use test and the vacancy condition
The qualifying condition that survives every amendment is continuity of use. The building must have been in a use falling within Class E for a continuous period of at least two years before the date of the prior approval application. Not two of the last five. Two continuous years, ending immediately before you apply.
Class MA also began life with a vacancy requirement and a floorspace cap of 1,500 m². Amendments to the Order taking effect in March 2024 changed that position. Check the consolidated text of Part 3 on legislation.gov.uk on the day you prepare the application rather than relying on a secondary summary, because this class has been amended more than once and older commentary is still circulating.
Evidencing two years of Class E use is a documents exercise, and councils are strict about it:
- Business rates records for the whole period, showing the description and the assessment dates.
- A lease or licence covering the period, or a chain of them with no gap.
- Utility bills or service contracts in the occupier's name.
- Dated photographs of the interior in use, and of signage.
- A statutory declaration from the owner or agent covering any period the paperwork does not.
Gaps are what sink these applications. A three-month void between tenants is fine for the use test if the use has not changed, because the building remains in Class E use even when empty, but you need to be able to show that the planning use never became something else in the interval.
The matters a council can consider at prior approval
The Order lists them, and a council cannot invent more. In broad terms the authority considers transport impacts, particularly safe site access, contamination risk, flood risk, noise from commercial premises affecting the intended occupiers, the effect on the intended occupiers of introducing residential use into an area important for general or heavy industry, storage and distribution or waste management, the adequacy of natural light in all habitable rooms, fire safety where the building is of relevant height, and in a conservation area the impact of losing the ground floor to residential use.
Address each one under its own heading in your submission, using the Order's own words as the heading. A case officer working through a checklist will find what they need, and refusals on a matter you did answer become much harder to sustain.
| Prior approval matter | What the council expects to see |
|---|---|
| Transport and access | Access arrangement, parking provision, cycle storage, servicing and refuse collection point |
| Contamination | A desk study for former industrial or fuel storage uses, with a phase 2 where the desk study flags it |
| Flooding | Flood zone confirmation, and where relevant a flood risk assessment with floor levels and access |
| Noise from commercial premises | Survey of the surrounding commercial noise sources and the glazing and ventilation specification |
| Natural light | Floor plans and elevations showing every habitable room's windows, with a daylight calculation where rooms are deep |
| Fire safety | The relevant statement where the building falls within the height threshold |
Contamination is the most frequently missed. Former print works, garages, dry cleaners and light industrial units in Class E(g)(iii) will almost always trigger a request, so commission the desk study before you apply rather than in week six of the 56 days.
Natural light and space standards as refusal grounds
Two conditions do most of the refusing.
Every habitable room must have adequate natural light. The Order does not define adequate, and councils apply it strictly on deep-plan office floorplates where a bedroom ends up 9 m from the nearest window with a light well between. Submit a plan with room depths dimensioned, mark every window, and where any habitable room relies on borrowed or oblique light, provide a daylight calculation rather than an assertion.
All new dwellings created under permitted development must meet the Nationally Described Space Standard. That is a floor area and bedroom count requirement, and it includes built-in storage and a minimum floor-to-ceiling height over a defined proportion of the dwelling. Office floorplates with structural cores in awkward places produce studio units that miss the standard by a few square metres, and there is no negotiation on it.
Illustrative example
An illustrative case: a two-storey 1980s office building of about 800 m², in continuous Class E(g)(i) use, on the edge of a conservation area but not within it, with a small car park. The prior approval submission runs to six sections matching the Order's list. Contamination is dealt with by a desk study noting a former petrol filling station two plots away and recommending no further work. Noise is dealt with by a survey of the adjoining trade counter unit and a glazing and acoustic trickle vent specification. Natural light is the section that takes the longest, because the ground floor has a deep central zone, and the answer is to place circulation and storage there and keep habitable rooms on the perimeter. That layout decision, taken before the application, is what makes the rest straightforward.
Article 4 directions in town centres
A council can remove Class MA in a defined area by making an Article 4 direction, and many have done so for primary shopping frontages, town centres and industrial estates. National policy expects such directions to be limited to situations where they are necessary to avoid wholly unacceptable adverse impacts, and to be applied to the smallest geographical area possible, but a direction that is in force binds you regardless of how you rate its justification.
Check three things before spending money. Whether a direction covers the building, whether it covers Class MA specifically or a wider set of rights, and the date it took effect. Directions are mapped on council websites and increasingly on the national planning data platform, and the parking and highways evidence a council expects in a designated centre is usually set out in the same suite of documents.
Assembling the submission and running the 56 days
The council has 56 days from the day after a valid application is received to notify its decision. If it does not, the development may proceed as described, subject to the conditions in the Order. That is a real deemed consent, and it is why validation matters more here than anywhere else.
- Confirm the building is not excluded, and check for an Article 4 direction.
- Assemble the two-year use evidence bundle before anything else.
- Commission the contamination desk study and, where the building sits near commercial noise sources, the noise survey.
- Prepare floor plans with room depths and window positions, and check every unit against the space standard.
- Write the statement with one section per prior approval matter, using the Order's wording.
- Submit with the correct fee, then diarise day 56 and confirm receipt in writing.
Councils will often ask for further information during the period, and supplying it does not restart the clock unless you agree to an extension. Agreeing one is sometimes worth it, because a refusal for want of information costs a second fee and another 56 days. Reading the council's validation checklist first will tell you which local documents that authority attaches to prior approval submissions, and scoping the technical work against the full list of report types is faster than guessing.
This is general guidance, not legal advice; check the position with your local planning authority or a qualified professional before relying on it. For specialist technical reports, qualified professional input may be required.
Enter your postcode on PlanScope to see which supporting reports a Class MA conversion at your building is likely to need.
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Frequently asked questions
How long must a building have been in Class E use for Class MA?
A continuous period of at least two years immediately before the date of the prior approval application. It is continuity that matters, not total time. A void between tenants does not break the use provided the planning use never changed to something outside Class E, but you need documents that cover the whole period.
Can I use Class MA on a listed building?
No. Class MA is not available where the building is listed or sits within the curtilage of a listed building, nor where it is a scheduled monument or on a site of special scientific interest, a safety hazard area or a military explosives storage area. Conservation areas are within the class, with an extra prior approval matter about losing the ground floor use.
What can a council refuse Class MA prior approval on?
Only the matters the Order lists. Those cover transport and access, contamination, flood risk, noise from commercial premises, the effect of introducing housing into industrial or storage areas, natural light in habitable rooms, fire safety at relevant heights, and the loss of a ground floor use in a conservation area. Anything outside that list is not a lawful reason.
Do Class MA flats have to meet space standards?
Yes. New dwellings created under permitted development must meet the Nationally Described Space Standard, which sets minimum floor areas by bedroom and occupancy, built-in storage and a minimum ceiling height over part of the unit. Deep office floorplates with awkward cores often produce studios a few square metres short, and there is no room to negotiate.
What happens if the council misses the 56 days?
The development may proceed as described in the application, subject to the conditions in the Order. That makes validation more important than usual, because the clock only runs on a valid application. Supplying extra information during the period does not restart the clock unless you agree to an extension of time in writing.
Sources and further reading
This article is general guidance about the planning system in England and, where stated, the rest of the UK. It is not legal or professional advice. Check your local planning authority’s validation requirements and take professional advice for your specific site.