Retail unit to flats above the shop: permission route
Class MA covers the change of use but not the building works. Here is which route fits, and how access, light and noise from the shop below decide the case.
Turning the floors above a shop into flats has two routes in England: prior approval under Class MA of the General Permitted Development Order, which covers the change of use only, or a full planning application, which you will need the moment you propose new windows, a new external stair or any extension. Most schemes end up needing the full application, because upper floor conversions almost always involve external alterations to get light and a separate entrance to work.
The two routes and what each covers
Class MA permits a change of use from Class E commercial, business and service premises to residential use, subject to prior approval by the local planning authority. The class carries qualifying conditions, including a period of prior Class E use before the application, and it excludes listed buildings and certain designated sites. Its restrictions were amended in 2024, so check the current text of Part 3 rather than working from an older summary.
Prior approval under Class MA is limited to specified matters. These include transport impacts, contamination, flooding, the impact of noise from nearby commercial premises on future residents, and the provision of adequate natural light in all habitable rooms. In a conservation area there is an additional matter covering the effect of losing the ground floor use.
The point people miss is that Class MA authorises a change of use, not building works. New window openings, a new door in the frontage, a rear stair, a dormer or a roof extension all need permission in their own right. There is also a separate route in Part 3 permitting a change to a mixed use with a small number of flats above certain ground floor uses, which suits a shopkeeper who wants to keep trading below.
A full application is the cleaner answer where the scheme involves any of that, and it lets you argue the case on its merits rather than within the narrow prior approval matters.
Access arrangements that make upper floors work
The single hardest constraint on a shop conversion is getting an independent access to the flats. Residential units above a commercial unit need their own entrance, their own stair and their own means of escape, and none of that can run through the shop.
Three arrangements come up repeatedly.
- A new door in the frontage taking about a metre of shop width, leading to a stair core. Simple, effective, and it reduces the retail unit, which the landlord may resist.
- A rear access from a service yard or a back lane, which preserves the frontage but depends on land you control and on the yard being safe and overlooked.
- Reuse of a historic side passage or existing separate door, which is common on Victorian parades and is by far the least disruptive where it survives.
Show the access on the drawings at an early stage, including the door width, the stair geometry and where bins and cycles will sit. An application that leaves the entrance vague invites an officer to assume the worst.
Noise, odour and hours from the unit below
Where the ground floor is a restaurant, a takeaway, a pub or a unit with plant, the noise and odour relationship is the substance of the case. National policy places responsibility on the incoming development to provide suitable mitigation where it is introduced near an existing business, so the flats have to be designed around the shop rather than the shop being restricted around the flats.
| Source below | What the assessment covers | Usual mitigation |
|---|---|---|
| Extraction plant and flues | Sound power data, flue termination height | Acoustic enclosure, flue extended above the roof |
| Deliveries and refuse handling | Timing and location of activity | Enhanced glazing, servicing management plan |
| Customer noise at closing | Existing licensed hours | Layout with bedrooms to the rear, acoustic glazing |
| Odour from cooking | Grease and odour abatement in place | Upgraded abatement, flue route away from windows |
A Noise Impact Assessment with survey data at the proposed window positions is the document that answers this, and where a food business sits below, the extraction issues are the same ones covered in our guide to takeaway extraction.
Do not offer conditions restricting the existing business. Officers will not impose them on a lawful use, and proposing them signals that the residential design does not work.
Daylight, room sizes and outlook
Adequate natural light in all habitable rooms is a prior approval matter under Class MA and a design issue in a full application, and it is where upper floor conversions fail. Rooms in deep plan buildings, or bedrooms served only by a light well, will not pass.
Nationally described space standards apply to new dwellings created under permitted development rights as well as to those granted permission, so check the floor areas against the standard for the intended occupancy before you draw the layout. A one bedroom flat squeezed under the standard is not a saving, because it cannot be built.
Outlook matters alongside light. A bedroom window facing a blank wall two metres away meets no reasonable test of living conditions, and where the only solution is a new window in a side elevation, that takes you into a full application anyway.
Bin and cycle storage on constrained plots
Town centre conversions rarely have space for the storage a council's standards require, and this is a recurring reason for refusal on otherwise good schemes.
Deal with it directly. Show the bin store on the plan with dimensions, state the number and size of bins for the number of flats, and give the carry distance to the collection point. Where storage has to sit in a rear yard shared with the shop, agree the arrangement and show it. Cycle storage needs to be secure, covered and reachable without carrying a bike through a flat.
Where the standards cannot be met on the site, say so and explain what is provided instead, referencing the town centre location and the accessibility of the site. Officers accept a reasoned shortfall more readily than a plan that ignores the requirement.
Fire safety and Building Regulations
Planning and building control run in parallel here, and the building control issues shape the planning drawings.
Means of escape from upper floor flats, a protected stair, fire separation between the commercial unit and the residential above, and sound insulation between uses are all Building Regulations matters, but they determine where the stair goes and how thick the floors are. Resolve them alongside the planning layout rather than afterwards.
Where a building reaches the height thresholds for higher-risk buildings, additional requirements apply under the building safety regime, including a fire statement at the planning stage for relevant schemes. Most parade conversions sit well below that, but check the height and storey count rather than assuming.
Answering objections from the commercial occupier
The tenant or owner of the shop below will often object, and their concerns are usually practical: noise complaints from future residents restricting trading, deliveries limited, refuse arrangements changed, or storage space lost to a stair.
Answer them in the Planning Statement rather than leaving them to the officer. Set out the acoustic mitigation designed in, confirm that no restriction on the existing lawful use is proposed, and show the servicing arrangement working for both uses. PlanScope drafts that statement from your project details and flags what evidence is still needed, and the full list of report types shows what a mixed use conversion usually requires.
This is general guidance, not legal advice. Check the position with your local planning authority or a qualified professional before relying on it.
PlanScope provides AI-assisted draft reports for planning applications. Reports should be reviewed before submission. We do not guarantee planning approval.
Frequently asked questions
Can I convert flats above a shop under permitted development?
Class MA permits a change of use from Class E to residential subject to prior approval, with qualifying conditions including a period of prior Class E use, and exclusions for listed buildings and certain designations. It authorises the change of use only. New windows, a new entrance door, a stair extension or a dormer all need planning permission separately.
What can the council refuse prior approval on?
Only the specified matters, which include transport impacts, contamination, flooding, the effect of noise from nearby commercial premises on future residents, and the provision of adequate natural light in all habitable rooms. In a conservation area there is an additional matter about the impact of losing the ground floor use.
Do the flats need their own entrance?
Yes. Residential units above a commercial unit need an independent entrance, stair and means of escape that do not pass through the shop. The usual solutions are a new door taking about a metre of shop frontage, a rear access from a service yard, or reuse of a surviving historic side passage on an older parade.
Who has to deal with noise from the business below?
The incoming residential development. National policy places responsibility on the new development to provide suitable mitigation where it is introduced near an existing business, so acoustic glazing, layout and ventilation design have to answer the noise rather than the shop being restricted. Do not offer conditions limiting the existing lawful use.
Do national space standards apply to a permitted development conversion?
Yes. Nationally described space standards apply to new dwellings created under permitted development rights as well as to those granted planning permission. Check the floor areas for the intended occupancy before drawing the layout, because a flat squeezed below the standard cannot be built and the design has to be redone.
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.