Class MA: office to home prior approval explained

Class MA is the permitted development right that allows a building in Class E use to become dwellinghouses in Class C3, subject to prior approval by the local planning authority. It sits in Schedule 2, Part 3 of the General Permitted Development Order, and it replaced the older office to residential right with a wider but more conditional version. Class MA prior approval is not a planning application, and the authority can only refuse on the matters the Order lists.

For a landlord converting a redundant office, shop unit or former surgery, the value of the route is certainty of principle. The risk is that a single qualifying condition takes the whole building outside it.

What Class MA allows and which buildings qualify

The right covers change of use from Class E, the commercial, business and service class, to Class C3 dwellinghouses. Class E covers shops, restaurants and cafes, offices, research and development, light industry, clinics, creches, gyms and indoor sport, so the pool of qualifying buildings is broad.

Two qualifying conditions do the heavy lifting.

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 application. A building that changed to Class E eighteen months ago does not qualify, and neither does one that has drifted into a sui generis use.

The building must have been vacant for a continuous period of at least three months immediately before the date of the application. Vacant means vacant, and a caretaker arrangement or a short licence can defeat it entirely.

A floorspace limit applied when the right was introduced and the Order has since been amended, so check the current text before relying on any size threshold. The same applies to the categories of land where the right is excluded.

Listed buildings, scheduled monuments and buildings in certain designated locations sit outside the right. Where the building is listed, this route is closed and a full application with listed building consent is the alternative.

Evidencing the two years and the three months

This is where applications fail, and the evidence is documentary.

For the two years of Class E use, produce leases, business rates records, VAT registration at the address, utility accounts and dated photographs. A statutory declaration from the owner helps but rarely stands alone.

For the three months of vacancy, produce the lease expiry or surrender, evidence that services were disconnected or reduced to standing charges, marketing particulars, and dated photographs of the empty interior. Council officers do check, and a neighbour who saw a business operating six weeks ago will tell them.

Where the building is partly occupied, consider whether the application should cover only the vacant part. Class MA can apply to part of a building, and a phased approach sometimes works better than waiting for the whole block to empty.

Establishing the lawful use before you buy is the same discipline that applies to any change of use, and the reasons applications are returned at validation are usually about missing evidence rather than about planning merits.

The prior approval matters

The authority can consider only the matters set out in the Order, and it must grant approval unless one of them causes unacceptable harm. Those matters include:

• Transport impacts of the development, particularly to ensure safe site access.
• Contamination risks in relation to the building.
• Flooding risks in relation to the building.
• Impacts of noise from commercial premises on the intended occupiers.
• Where the building is in a conservation area and the development involves the loss of ground floor commercial use, the impact of that loss on the character or sustainability of the area.
• Impacts on intended occupiers of introducing residential use into an area the authority considers important for general or heavy industry, waste management, storage and distribution.
• The provision of adequate natural light in all habitable rooms.

Natural light is the matter that defeats most deep-plan office conversions. Every habitable room needs adequate natural light, and a bedroom lit only by a borrowed light or a corridor will fail. Draw the window positions and room layouts properly rather than showing an indicative fit-out.

Where the building sits near a nightclub, a takeaway with late extraction, or an industrial neighbour, the noise matter needs an assessment rather than an assertion. A Noise Impact Assessment addressing the existing commercial sources and the mitigation proposed is the document the environmental health officer will read.

What to submit and how long it takes

The authority has 56 days from receipt of a valid application to determine it. A fee is payable per proposed dwelling, set nationally and indexed, so check the current schedule.

Alongside the form and plans, expect to submit contamination information, a flood risk position where the building is in Flood Zone 2 or 3, a transport statement where access changes, a noise assessment where commercial sources are close, and a floor plan set showing window positions and room areas.

Space standards apply. Dwellings created under Class MA must meet the nationally described space standard, which sets minimum gross internal areas by bedroom and bedspace count and minimum bedroom sizes. That requirement, more than any other, determines how many units a floorplate will yield.

Where the building lies in Flood Zone 2 or 3, a Flood Risk Assessment addressing the residential use and the finished floor levels is needed. Where past industrial use is likely, a Land Contamination assessment prepared by a suitably qualified and experienced person is legally expected, and the draft is a starting point for that professional rather than a substitute.

The building fabric questions nobody asks early

Two technical issues decide whether a Class MA conversion is buildable, and neither is a prior approval matter.

The first is structure. Office floor loadings differ from residential ones, and a 1970s frame with a lightweight partition system may need work to take masonry separating walls. The second is servicing. Adding kitchens and bathrooms to a floorplate designed for a single tenant means new soil stacks, and the route for those stacks through the frame is often the constraint that fixes the unit layout.

And the fire strategy sits outside the planning route entirely, under the building regulations regime. On a taller building the Building Safety Act 2022 gateway process applies, which is a longer programme than the 56 day prior approval period suggests.

When Article 4 removes the right locally

Many councils have made Article 4 directions removing Class MA in defined areas, typically town centres, primary shopping frontages and designated employment areas, to protect commercial floorspace.

Check the direction itself, rather than the fact that one exists. Directions define an area by map, and a unit one street outside the boundary may still have the right. They also have a commencement date, and some are made with immediate effect while others take twelve months.

But where a direction applies, the route is a full planning application for change of use, judged on the development plan. That is a slower and less certain process, and it is also one where a well-argued case can achieve things Class MA cannot, such as a different unit mix or an extension.

Understanding where prior approval sits between permitted development and a full application is worth doing before you choose. The halfway house that prior approval represents is narrower than a planning application and far more certain when the conditions are met.

To check which documents your building is likely to need, browse the report types by category.

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.