Class MA Explained: Converting Commercial Space to Homes Without Planning Permission

What Class MA actually permits

Class MA permits a change of use of a building, and any land within its curtilage, from a use falling within Class E (commercial, business and service) to Class C3 (dwellinghouses), subject to prior approval rather than a full planning application [1]. The building must have been in a qualifying use for a continuous period of at least two years immediately before the application. That two-year continuity test has not changed since Class MA was introduced and remains the one qualifying condition every scheme still has to satisfy.

The 2024 changes: no more floorspace cap, no more vacancy test

When Class MA was introduced in 2021, it came with two significant limits: a 1,500 square metre cap on convertible floorspace, and a requirement that the building had stood vacant for at least three continuous months. Both were removed by amendment on 5 March 2024, and both provisions are now formally omitted from the legislation rather than merely relaxed [1]. A large, actively trading commercial building can now qualify in a way it could not three years ago. This is the single biggest shift in who can use this right, and exactly the kind of change that gets misreported once a summary is a year or two old, which is why the current legislative text, not a blog post about it, is the only reliable reference.

What still disqualifies a building

Removing the floorspace and vacancy tests did not remove every exclusion. Class MA cannot be used if the land is a site of special scientific interest, a listed building or its curtilage, a scheduled monument, a safety hazard area, or a military explosives storage area [1]. It is also excluded in areas of outstanding natural beauty, National Parks, the Broads, World Heritage Sites, and on agricultural tenancy land without both landlord's and tenant's consent. None of these exclusions were touched by the 2024 changes. A central London building is far more likely to be caught by a listing designation or a local Article 4 direction than by any countryside exclusion, but all still apply as absolute bars.

The prior approval tests: what a council can still assess

Prior approval requires the local authority to determine whether its approval is needed against a defined list: transport impacts and safe site access, contamination risk, flooding risk, noise impact on future occupiers, adequate natural light in every habitable room, loss of a registered nursery or NHS health centre, and, for buildings with two or more dwellings meeting a height condition, fire safety impacts assessed with the Building Safety Regulator [1]. Where the building sits in a conservation area and the change affects the ground floor, conservation area impact is also tested. This is faster than full planning, but not a rubber stamp, a scheme that fails any single test falls back to needing full planning permission.

The three-year clock, and what happens if it isn't met

Once prior approval is granted, development must be completed within three years, and the building must remain in residential use only [1]. This matters for phased conversions of larger buildings, where a floor-by-floor programme needs to be planned against the clock from the outset.

Article 4 directions: where London councils have switched it off

Local authorities can withdraw Class MA rights entirely within defined areas. Lambeth is a clear example: the council confirmed non-immediate Article 4 directions withdrawing Class MA rights across the Central Activities Zone, key industrial and business areas, and several town centres, with modified directions in force since 28 October 2022 [2]. Other London boroughs have made comparable directions. Checking whether a borough has withdrawn the right for a given site is the first question, not optional due diligence.

Class MA versus full planning: when the statutory route isn't the better one

A scheme that technically qualifies is not automatically the scheme that should use it. Prior approval's narrow test list means a council cannot negotiate unit mix or layout quality the way it could under full planning. For larger or more prominent buildings, full planning can remain the better route even where Class MA is technically available.