One of my first blog posts ever, on 1 July 2016, was Time To Review The “C” Use Classes? It was definitely time then, ten years ago! Even more so now. In writing this stuff, I do sometimes wonder, what’s the use…?
“What’s the use?” is still such a particularly difficult question when it comes to overnight sleeping accommodation.
One aspect of the issue (the boundaries of use class C1) has of course arisen on several occasions over the last few years in relation to the accommodation of asylum seekers within hotels, but has repeatedly been ducked by the courts (see for instance my 15 November 2025 blog post There Was Some Controversial News In Planning This Week But Instead Let’s Focus On the Latest Ruling In The Epping Forest Asylum Seekers Litigation).
But the blurred boundaries I talked about in the blog post between, for instance use classes C3, sui generis and C4, still exist, with so much now falling into that “sui generis” (“of its own kind”/”in a class of its own”) catch-all.
(Incidentally, I think that the first recorded judicial use of this informal Latin tag for uses that don’t fall within any classes of the Use Classes Order is in a Divisional Court case from 1975, Tessier v Secretary of State, where, to quote from the Planning Encyclopaedia: “a building had been used as a sculptor’s workshop, the sculptor having operated industrial machinery and tools for cutting out huge stone masonry blocks and other sculpting activities. The Divisional Court held that this was not an industrial use, because the primary activity of the sculptor was the artistic work of sculpture and not the making or manufacturing of an article in the course of a trade or business.” Cases back then all seemed so much more, well, innocent…)
I just wanted in today’s brief post to draw attention to a recent High Court judgment which grapples with another of these “use categorisation” questions, in the context of planning enforcement: Empire Communications Limited v Secretary of State (Deputy High Court Judge Tim Smith, 2 April 2026). This concerned former offices which were converted, purportedly in reliance on permitted development rights. Prior approval was granted for change of use to residential. Following conversion of the buildings, the local planning authority, the London Borough of Camden, issued an enforcement notice alleging that the conversions had in fact been to “serviced apartments for short term lets (Sui Generis)” rather than to residential C3 use.
An inspector dismissed appeals against the notice and in so doing found that the building should be treated as a single planning unit rather than the apartments within them being treated as a series of independent units of occupation. He agreed with the council that the use was sui generis, taking into account a number of factors which “ranged from how the individual apartments were laid out and appointed, the common areas in the Buildings, how the space was advertised, and the services that were offered to guests.”
I have looked back at the inspector’s decision letter and he records the following, by way of example:
“The layout of the buildings and apartments contain many of the features of a C3 residential flat, with full sized domestic-style kitchens and facilities. In this case, spacious apartments are also a feature of the offer in relation to the short term lets.
However, hotel-style key cards to operate the doors and lighting in all units in 254-256 and the ground floor of 258, plus door access on the upper floors of 258, are not common features of residential flats in C3 use, despite Ms Mojzis’ reference to another development where that is the case. There are no individual post boxes and no doorbells on the apartment doors or at the entrance to the buildings. And the third and fourth floors each contain two inter-connecting apartments, designed to facilitate independent or joint use, which is not a typical feature of C3 dwellinghouses and is more commonly found in hotels.
The large reception and sitting area is also consistent with short-term letting and the functional closure of the independent entrance to 254-258 and the linking of the buildings on each floor facilitate more effective management of the apartments as a single operation, even if similar arrangements may feature in some C3 apartment buildings.
The apartments have been fully furnished to a high standard with similar furnishings and effects and fully fitted kitchens (including full-sized fridge freezer, oven, hob, microwave, kettle, toaster, cooking utensils, crockery and cutlery). Each contains a TV and WiFi, hotel-style safe in a cupboard, a phone to contact reception and bed linen. I have not seen any evidence of significant quantities of personal possessions in any of the units at any time, or of any form of personalisation of the living spaces. The only exception being Ms Mojzis’ statement that in relation to five lets occupiers brought their own furniture.
The photographs show baggage trolleys in the reception area, there is a small lounge area adjacent to the reception, and a concierge desk near the entrance. Cycle stores are provided in each building, but in the photographs in evidence there were very few cycles in them, to the extent that they were largely empty at my site visit and in all the photographs provided in evidence.
The apartments have been advertised on Booking.com, Expedia, siyu.co.uk, Londonservicedapartments.co.uk, and the Sanctum website. With the evidence before me, the Sanctum website appears to have emphasised nightly stays over longer ones, with an option (previously) to stay longer. “Long stay special” offers for stays of 90, 180 or 365 nights, were described as “discounted rates on extended stays, whether you are relocating, studying or having medical treatment”. A small number of Assured Shorthold Tenancies (ASTs) were also arranged through residential lettings agents Silverdoor, Fox Gregory and Ultra Estates.
Users are referred to as guests, and the services offered include weekday maid refresh service, towels and bed linen changed twice a week (the photographs show a hotel style ‘please make up the room’ door handle sign), toiletries on arrival, tea towels, washing up liquid and sponge, 24hr reception and security, and all utility bills. Tea and coffee sachets are also seen in many of the apartments in the photographs in evidence, along with tissues in the bathrooms and hair dryers.
Ms Mojzis advised at the Inquiry that ironing facilities and towels were provided, but not always for longer stays, for which maid services were charged separately. Other chargeable services are also advertised on a daily, nightly or monthly basis including parking, weekend maid service, cots and highchairs and laundry/dry cleaning service. The Sanctum website terms and conditions specify check in and check out times, and offer early check-in and late check-out for an additional fee.
The Sanctum website associates serviced apartments with aparthotels, and describes them as being “similar to hotels but offer a more homely experience”. It states that, “serviced apartments have access to many facilities in a more spacious and comfortable setting than the average hotel room, including a fully equipped kitchen, living area, bathroom, and more”. And that hotel amenities go slightly further than those offered in serviced apartments, with additional services such as breakfast, mini-bar and room service.”
The inspector went onto consider in some detail evidence as to lengths of stay, before concluding:
“Overall, considering all the evidence, the appellant has not demonstrated that the use which has occurred is not a sui generis one. The overall character of the use is distinguishable from a Class C3 use, and the overall number of units in the entire building(s) operating together in a similar manner contribute to that character. Although there have been significant vacant periods, and the number of very short lets has been limited to no more than 90 nights per apartment per year, many more of the lettings have been for 90 nights, or only slightly longer. The housekeeping, services and facilities within the apartments, concierge/security and additional services, and the absence of evidence of personal effects also contribute to that, and bear a number of resemblances to a hotel use.
On the balance of probabilities, with the evidence before me, the use that has occurred is the sui generis use of the property for serviced apartments for short term lets.”
How to determine whether this was in fact correct? The judge recognised the potential complexity of the issue:
“In forming a judgement about whether the Inspector’s conclusions were correct, a particular complication is that the character of uses involved in this case are, in principle, capable of a number of different classifications. A residential-type use (to employ a neutral term) could be at least use Class C3 (dwellinghouse), or C1 (hotel, boarding house or guest house), or C2 (residential institution), or C4 (house in multiple occupation), or one of at least two types of sui generis use (hostel, or serviced apartments).”
The judge distilled “from the case-law the following propositions: (a) whether a particular use departs from that of a use class C3 dwelling is a question of fact and degree (per Moore); (b) to answer that question one needs to look at the use of the property in the round (per Welwyn Hatfield); and (c) the character of the use, and (as an example) the duration of stay, is a factor in reaching a decision but is not determinative (per Gravesham and Mayflower respectively).”
The judge declined to interfere with the exercise of the inspector’s judgment in carrying out that task. As to the difficulties of complying with an enforcement notice preventing the use of the buildings as “short-term let serviced apartments”, the inspector had “clearly identified and articulated the elements of the operation here which led him to conclude that the use was as serviced apartments”. I should add that in determining whether the use was “short-term” in this case the inspector did not consider that the 90-day rule in sections 25 and 25A of the Greater London Council (General Powers) Act 1973 was relevant. The end result, given that the office to residential prior approval had been lawfully implemented, was that the only lawful use to which the buildings could return was that of an office.
The judgment does create some real questions as to where the boundary between residential C3 use and sui generis serviced apartment use lies, in a world where some “build to rent” operators do, I suspect, offer many of the services in evidence here? I understand that the claimants have applied for permission to appeal to the Court of Appeal. Some additional clarity would be very helpful.
Even more helpful, of course, would be for the Government to review whether the categorisations within the “C” Use Classes remain fit for purpose and, if not (they don’t, in my view), to embark on updating them!
Simon Ricketts, 17 May 2026
Personal views, et cetera
