Class MA in 2026: Commercial to Residential Route

Class MA is the permitted development right that lets a shop, office or other commercial building become homes without a full planning application. It has quietly reshaped how empty high-street and town-centre premises get brought back into use, and the 2024 reforms made it available to far more buildings than before. But "permitted development" is one of the most misread phrases in the planning system. This article explains how the Class MA route to a commercial-to-residential conversion actually works in 2026 — what makes a building eligible, what prior approval does and does not decide, and the points where the route most often trips people up. It is written for developers, landlords and owners weighing a conversion, and it deliberately covers the route rather than the build cost, which we address separately.

What Class MA Actually Is

Class MA sits within the Town and Country Planning (General Permitted Development) Order, and it grants a national permitted development right to change the use of a building from the "commercial, business and service" use class — Use Class E — to residential use, Class C3. Use Class E is broad: it covers shops, offices, restaurants, cafés, gyms, clinics, nurseries and certain light industrial uses, which is why so many town-centre buildings fall within scope. Because it is a permitted development right, the change of use does not need a full planning application; instead it runs through a prior approval process, in which the local planning authority checks a defined set of impacts rather than judging the scheme on planning merit as a whole.

That distinction is the whole point of the route, and the source of most of its misunderstandings. Prior approval is narrower and faster than a planning application, but it is not automatic, and it does not touch the building work at all. Understanding what it covers — and what it leaves to other regimes — is what separates a conversion that proceeds cleanly from one that stalls.

Why the Route Matters Before You Commit

Whether Class MA is available decides the shape of a scheme long before any building work is priced. If the right applies, a developer avoids the cost, delay and uncertainty of a full planning application and works to a defined statutory timescale. If it does not — because an Article 4 direction has withdrawn it, or the building fails a qualifying condition — the appraisal changes entirely, and a scheme bought on the assumption of a quick prior approval can lose its financial logic overnight.

This is why eligibility is a pre-purchase question, not a post-purchase discovery. The route is generous but conditional, and the conditions are precise. Treating "it's Class E, so it's permitted development" as a settled fact rather than something to verify is the first and most expensive assumption a buyer can make.

What Makes a Building Eligible

The core qualifying test is use and time. The building must have been in a use falling within Class E — or an earlier use that carried into Class E — for a continuous period of at least two years immediately before the prior approval application, and in lawful use throughout. This two-year rule is the condition that most often quietly disqualifies a building: a recently re-let unit, a change of use that is too fresh, or a period of unlawful use can all break the continuity the right depends on.

The 2024 reforms widened the funnel considerably. The Town and Country Planning (General Permitted Development) (England) (Amendment) Order 2024, in force from 5 March 2024, removed the previous 1,500 square-metre floorspace cap and the requirement that the building be vacant for three months before applying. In practice that brought large office blocks, retail warehouses and occupied premises within reach of the route for the first time. The two-year use condition, however, was kept — so scale is no longer the limiting factor, but history still is.

A number of exclusions also apply. Listed buildings and land within their curtilage are outside Class MA, as are certain other protected or hazardous sites, and — importantly — a local authority can issue an Article 4 direction removing the right across a defined area, which several have done to protect town-centre commercial frontages. New homes created under the right must also meet the nationally described space standard, with a minimum of 37 square metres for a one-person dwelling, so a floor plate that looks like it could hold a given number of units may lawfully hold fewer.

What Prior Approval Does — and Doesn't — Decide

Under Class MA the local planning authority cannot refuse on general planning grounds. It can only consider a fixed list of matters: transport and highway impacts, particularly safe site access; contamination risk on the site; flooding risk; the impact of noise from nearby commercial premises on future residents; the provision of adequate natural light to all habitable rooms of the new dwellings; and the effect of introducing residential use into an area the authority considers important for industry, storage or waste management. Where the building is in a conservation area, the authority may also weigh the impact of losing a ground-floor commercial use.

Natural light is worth singling out, because it is the most common reason Class MA applications are refused. Deep commercial floor plates and windowless internal spaces do not easily convert into habitable rooms with adequate daylight, and an authority can refuse the whole application if even one proposed unit is not properly evidenced. The authority generally has 56 days to determine a prior approval application, and where approval is granted, the conversion must normally be completed within three years.

Permitted Development Is Not the Same as Compliant

The single biggest error on the Class MA route is treating prior approval as the end of the regulatory story. It is only the beginning. Once the change of use is secured, every element of the building work must satisfy the Building Regulations in full, exactly as it would under a full planning consent — a point we set out alongside the wider duties in our guide to UK building regulations and safety legislation.

For a conversion, fire safety is usually the most demanding part of that. Residential compartmentation, protected escape routes and fire-rated construction are far stricter than commercial standards, and the requirements are set out in Approved Document B. Sound insulation, energy performance and ventilation each bring their own standards. And where a conversion produces a residential building of at least 18 metres or seven storeys with two or more dwellings, it becomes a higher-risk building under the Building Safety Act regime, overseen by the Building Safety Regulator, with its own gateway approvals and, for new residential buildings over 18 metres, a second-staircase requirement for work commencing from 30 September 2026. The route to that work is Class MA; the work itself is a different and larger undertaking, and its cost is where conversions are won or lost — which we cover in our look at the costs that sit below the surface.

Where the Route Trips People Up

The failures are rarely dramatic; they are the predictable result of skipping the checks. A buyer assumes Class MA applies without confirming the two-year use history, and finds continuity was broken by a recent letting. An Article 4 direction covering the parade is missed, and the "permitted" route was never available. A scheme is drawn to a unit count the natural-light rule will not support, and the application is refused. Or — most commonly — prior approval is secured and treated as the finish line, when it is really the starting gun for the Building Regulations work that carries most of the budget and risk. Each of these is avoidable, and far cheaper to catch before exchange than after.

What Better Practice Looks Like

A disciplined approach confirms the route before the building is bought. That means checking the planning history for a clear two-year record of qualifying use, checking with the local authority for any Article 4 direction that would withdraw the right, and confirming the building is not listed or otherwise excluded. It means testing the proposed layout honestly against the natural-light and space-standard requirements, rather than maximising units on paper and hoping the authority agrees.

It also means running the prior approval and the building-standards questions in parallel, not in sequence. Because Class MA decides only the change of use, the fire, structural and services realities need to be assessed at the same time — ideally through an early compliance and building safety review — so a scheme is not granted prior approval only to prove unbuildable, or buildable only at a cost that erases the margin. Bringing that judgement in early is usually the difference between a route that works and one that merely looked like it would.

What to Consider Before You Act

Before committing to a Class MA conversion, it is worth being able to answer a short set of questions plainly rather than optimistically:

The Takeaway

Class MA is a genuinely useful route. It has made it faster and more certain to turn redundant commercial buildings into homes, and the 2024 reforms opened it to a far wider range of premises. But it is a route to a change of use, not a shortcut through the standards that make a building safe to live in. The prior approval decides whether you may convert; the Building Regulations decide what the conversion has to be; and the gap between the two is exactly where unprepared schemes come unstuck.

Frequently Asked Questions

Does Class MA apply to a shop or office in a town centre like ours?

Often, yes — shops, offices and most other Use Class E premises on a typical high street can fall within Class MA, which is why the route is so relevant to town-centre and local parades. But two things decide it: the building must have been in a qualifying commercial use for at least two years, and there must be no Article 4 direction withdrawing the right in that area. Some authorities have used Article 4 directions specifically to protect commercial frontages, so both points should be checked with the local planning authority before you rely on the route.

Do I still need Building Regulations approval if Class MA applies?

Yes, in full. Class MA only grants the change of use. All of the building work — fire safety, sound insulation, energy performance, ventilation and structure — must meet the Building Regulations exactly as it would under a full planning consent. Prior approval is the first step, not a substitute for compliance.

How long does prior approval take, and can the council refuse it?

The local planning authority generally has 56 days to determine a Class MA prior approval application. It cannot refuse on broad planning grounds, but it can refuse on the specific matters the right allows it to assess — most commonly inadequate natural light to habitable rooms, but also flooding, contamination, noise and transport. Evidencing those matters properly at the application stage is the best protection against a refusal.

This article is general guidance on the Class MA route as it stands in 2026, not project- or site-specific advice. Planning status, eligibility and building safety obligations should be confirmed for your specific building by a qualified planning and building professional. To discuss a particular site, speak to our team about early consultancy support for developers and contractors.