Do I Need Planning Permission for a Change of Use in London? (2026)
When a London change of use needs planning permission and when the Use Classes Order allows it — commercial to residential, HMOs, offices to flats and prior approval, explained.
Change of use is where planning law becomes genuinely technical, because the question is not what you build but how a property is used — and the answer runs through the Use Classes Order. Some changes are invisible to the planning system because they stay within one use class; others are permitted development but need prior approval; and others need a full planning application. For London homeowners and small investors the practical questions are usually the same three: can I turn a shop or office into flats, can I run a business from home, and can I create a shared house. This guide sets out how the Use Classes Order decides each in 2026.
The classes are national, but Article 4 directions and local policy change the picture street by street across London's 33 boroughs. We confirm the use class, the applicable permitted-development right and any Article 4 restriction for your specific address before drawings are commissioned, free.
How the Use Classes Order decides whether you need permission
Every property has a planning use, sorted into classes by the Use Classes Order. Class C3 is a dwellinghouse; Class C4 is a small house in multiple occupation; the broad Class E covers most commercial, business and service uses including shops, offices, cafés and clinics. The rule is simple in principle: changing use within the same class is not development and needs no permission, while changing between classes is development that needs permission unless a permitted-development right or prior-approval route covers it. Working out the correct existing and proposed class is always the first step.
- Same class in, same class out — not development, no permission needed
- Class C3 — dwellinghouse (a normal home)
- Class C4 — small HMO, 3 to 6 unrelated sharers
- Class E — most shops, offices, cafés, clinics and light industry
Can I convert a shop or office into flats?
Often yes, under a permitted-development right that allows change from commercial Class E to residential Class C3 — but it requires prior approval, not a full application. Prior approval means the council cannot refuse on general planning grounds but can refuse on specified matters such as flooding, contamination, noise, natural light to habitable rooms and highways. There are floorspace limits and conditions, and the right is switched off in some areas and for listed buildings. It is a real application with real refusal grounds, so it needs proper drawings and an assessment against each prior-approval matter. Since the introduction of national space standards to this route, every new home created must also meet the nationally described minimum floor areas, which quietly rules out the tightest office-to-flat schemes.
Do I need permission to create an HMO?
Converting a Class C3 dwellinghouse into a small Class C4 HMO for three to six unrelated people sharing facilities is generally permitted development — nationally. The complication is Article 4: many London boroughs have made directions removing this right across whole wards or the entire borough, precisely to control the spread of shared housing, so in those areas a full planning application is required. A large HMO for seven or more people (sui generis) always needs planning permission. Licensing under the Housing Act is a separate requirement on top of planning.
- C3 to small C4 HMO (up to 6 sharers) — permitted development nationally
- Article 4 directions remove that right across much of London
- Large HMO (7+ sharers) — always needs full planning permission
- HMO licensing is separate from, and additional to, planning
Can I run a business from my home?
Usually without planning permission, provided the overall use of the property remains that of a dwellinghouse. Working from home, seeing the occasional client or using a room as an office is generally fine because there is no material change of use. Permission becomes necessary when the business changes the character of the property — significant customer or delivery traffic, staff coming to work, signage, noise or anything that makes neighbours experience it as a business rather than a home. The test is whether the residential use remains the primary one. In practice the council looks at cumulative effects rather than any single factor: a quiet consultant working alone at a laptop is invisible to the planning system, whereas the same house running a beauty salon with a stream of clients and a treatment room, a food business with regular deliveries, or a workshop with staff and vans, has crossed into a mixed or fully commercial use. Where a business grows to that point it is far safer to apply for the change than to wait for a neighbour complaint, because an established unauthorised commercial use is exactly what triggers enforcement, and a refused retrospective application leaves you having to reverse the business.
What does a change-of-use application involve?
For a prior-approval route, the council needs existing and proposed floor plans, a site location plan, and a statement addressing each prior-approval matter that applies — light, noise, flooding, contamination, highways. For a full change-of-use application the assessment is wider, covering amenity, parking, the loss of the existing use and local policy. In both cases accurate drawings showing the proposed layout, and a clear account of the use before and after, are what let the council reach a decision. We identify the correct route, prepare the drawings and structure the submission around the matters the council must consider. A prior-approval decision must be issued within a set period — typically eight weeks — and if the council fails to determine it in time the right can be exercised by default, which is one reason the route is popular; but that only helps if the application was valid and complete to begin with, so the quality of the submitted plans and the prior-approval statement genuinely matters. A full change-of-use application, by contrast, is judged on the local development plan and can attract conditions, planning obligations and, in some boroughs, contributions, so it pays to anticipate the policy tests — loss of a valued commercial frontage, residential amenity, cycle and refuse storage — in the drawings rather than in a late amendment.
Is a change of use ever exempt, and what about lawful use?
Two questions come up constantly once the basic classes are understood: when is a change so minor that the planning system ignores it, and how do you prove what a building is lawfully used for in the first place. Both matter because a change of use is only unlawful if there was a use to change from — and the existing lawful use is not always what the current occupier assumes. Getting this baseline right is often the difference between a smooth conversion and an enforcement problem years later.
When a change of use is not material
The planning system only bites on a material change of use — one significant enough in planning terms to matter. A minor or incidental change does not count. Ancillary uses that serve the main use, such as a home office within a dwelling or a small staff kitchen within an office, are absorbed into the primary use and need no permission. The test is one of fact and degree: how much has changed, how noticeable it is to neighbours, and whether the planning character of the property has genuinely shifted. Because it is a judgement rather than a fixed rule, borderline cases are exactly where a certificate of lawfulness earns its place.
Proving an existing or proposed lawful use
Where a use has continued unchallenged for long enough — generally ten years for a change of use — it can become lawful through the passage of time, and the council can be asked to confirm this with a Lawful Development Certificate. The same certificate can be sought in advance to confirm that a proposed change genuinely does not need permission, giving certainty before money is spent. For London investors buying premises with an unclear history, establishing the lawful use with dated evidence and accurate plans is often the safest first move, and it is the document a future buyer or lender will want to see.
| Change | Typical route | Key control | Notes |
|---|---|---|---|
| Class E (shop/office) to C3 flats | Prior approval | Light, noise, flood, highways | Floorspace limits; off in some areas |
| House (C3) to small HMO (C4) | Permitted development | Article 4 directions | Full application where Article 4 applies |
| House or flat to large HMO (7+) | Full planning application | Amenity, policy | Sui generis; licensing separate |
| Working from home | Usually no permission | Material change of use test | Permission if character changes |
| Within the same use class | No permission needed | Not development | e.g. one Class E use to another |
Related services: Change of Use Drawings, HMO Conversion Drawings, Planning Permission.
Frequently asked questions
Do I need planning permission to change the use of a building in London?+
Can I convert a shop or office into flats without full planning permission?+
Do I need planning permission to turn my house into an HMO in London?+
Can I run a business from my home without planning permission?+
What is a Lawful Development Certificate and do I need one?+
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