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A school that cannot seat its pupils in one sitting has a timetable problem before it has a catering problem. Lunch is compressed into a window that also has to serve staff breaks, a second sitting pushes the afternoon lessons back, and on wet days the queue forms in a corridor. Add the assemblies, exams and parents' evenings that all want the same room, and the school ends up renting the space it should already own — or doing without.
The obvious answer is a dining hall extension. The reason schools look for something else is what that extension involves: a capital bid that competes with every other project in the estate plan, a design and tender process, and a construction programme that runs into a school year and a half before the first pupil sits down. Meanwhile the timetable problem does not wait.
This is written for bursars, business managers, premises and estates teams, and the contractors advising them. It sets out the realistic options for adding dining and multi-use space, the criteria that actually decide between them, and how to work out the size you need before anyone quotes you.
Multi-use is not a marketing word here — it is the source of most of the mistakes in this kind of project. If one space has to serve several functions, it has to meet the hardest requirement from each of them at once.
The practical consequence: a room designed only as a canteen often fails as an exam hall, and a room designed as a sports hall is expensive to heat and furnish for lunch. Decide which of these functions is primary, which two or three must work properly, and let the rest be compromises.
A permanent extension or new-build block. The benchmark case. It becomes part of the estate, it takes the load, and it is what a capital bid is normally written for. The trade-offs are budget competition, planning and building control, and time. In most jurisdictions you are looking at a multi-year path from the funding decision to a room in use, and once it is built the money is committed and the room cannot move if pupil numbers shift between sites.
Re-purposing something that already exists. The cheapest option on paper and the most disruptive in practice. Converting a hall, workshop or under-used classroom means displacing what is in there, and it usually leaves the school with the same problem one move along — which is why it tends to be a holding measure rather than a solution.
A marquee or temporary structure. Real capacity, on site, within weeks. The costs are operational rather than capital: build and strike days, a crew, ground that has to take stakes or ballast, no insulation so heating and cooling are either expensive or absent, temporary services, and a calendar that depends on the season. A marquee is a good answer for a single event or a fixed exam period. For daily dining over a school year, the set-up and weather exposure become the objection.
Modular buildings. Factory-made units craned or delivered onto prepared foundations, then connected to services. Faster than traditional construction and repeatable, but it is still a construction project: foundations, utility connections, planning or permitted-development checks, and a fixed position once installed. If the module is later surplus, it has to be lifted out again.
A hard-sided relocatable structure. A towed or transportable building with insulated walls and roof, panel floors, real doors and windows, delivered in a road-legal configuration and then opened out on site to a much larger footprint. It arrives as equipment rather than as a building contract, which changes the funding route, the timetable and the exit. What it does not do is disappear — it still has to be sited, connected and signed off, and somebody has to be responsible for anchoring it.
The rest of this article deals with how to compare them, because the answer is rarely the same for a 300-pupil primary and a 1,200-pupil secondary.
How the school can pay for it. A capital bid takes years and competes with roofs and boilers. A relocatable unit can often be bought from a different budget line — devolved capital, a department grant, a fundraising campaign, an academy's own reserves, or a donation — and it can be bought in stages, one unit now and another when pupil numbers arrive. Funding route often decides the option before the technical merits do.
The works window. Schools have a natural installation slot and everything else has to happen without disrupting teaching. A project that needs eight or ten weeks of contractors on site is a summer-holiday project, and a wet summer is a lost year. A structure that arrives on a low-loader and is open in a day fits a shorter window and can be done in term time with the right access and separation from pupils. Ask any supplier to state the delivery-to-in-use time in writing, including ground preparation.
The site. Delivery access — gate widths, turning space, overhead cables, whether a crane or a low-loader can reach the intended position. Ground that has to carry a loaded structure, as a bearing question rather than an average one, especially if the site is soft or on a slope. Distance to the existing kitchen and to power, water and drainage, because those connections are frequently the largest hidden cost in the project. If the room will be used for cooking rather than simply for serving, the electrical load and ventilation requirement change the specification completely.
Compliance and who signs off. The school remains the responsible body. Whatever is installed — extension, module, marquee or relocatable building — the education authority, planning department, building control and fire authority will each want their own question answered. A supplier can provide technical documentation, drawings and structural information; it cannot decide for your authority, and any supplier who offers a blanket "no approval needed" should be tested on it in writing.
Lifespan and the exit. If pupil numbers are rising, a permanent room is the right answer. If they are flat, falling, or the site is leased, or the school is federating, the ability to move the room to another site or sell it on matters as much as the purchase price. Ask what the resale and relocation path looks like.
Weather and season. Temporary and semi-permanent structures are affected by wind, rain and ground saturation in a way that buildings are not. This is a specification question, not a marketing one, and it should be answered in writing for your site rather than by reference to a generic figure. For any structure with a large surface area, anchoring or tie-down requirements depend on ground conditions and exposure, and the supplier should state them alongside the confirmable structural data.
Do this before you request quotations, otherwise suppliers will quote their standard models and you will end up comparing the wrong things.
Start from the number of pupils who must be fed in one sitting, and assume the second sitting only as a scheduling device, not as a space saver. As a planning starting point, allow roughly 1.0 to 1.5 m² per seated pupil including circulation between tables; that range is broad because it depends on whether tables are rectangular and shared or individual, and on how much of the space is taken by the servery. Confirm the figure against your own authority's design guidance rather than ours — the number that matters is the one your authority applies.
Then add, separately, the space that is not seating:
As a worked example of the method — not a specification for a particular model — a secondary school feeding 600 pupils over two sittings needs 300 seats at a time. At 1.2 m² per seated pupil that is 360 m² of seating area, plus servery, queue, circulation and storage, so the room is comfortably over 400 m². A school that tries to do it in one sitting needs roughly double that. This is how the requirement should be written down before it goes to a supplier.
Two numbers worth keeping apart, because they get conflated in supplier conversations. The maximum occupancy of a space is what the floor and exits can physically hold. The comfortable dining capacity is the number that lets a pupil sit, eat and leave within a lunch period without a crush. The approved or licensed occupancy is what your local authority permits once exits, facilities and use are assessed. Only the first is a property of the structure; the other two are decided by how you use it and by your authority.
One option that sits between a marquee and a building is an expandable event trailer: a transportable unit with a rigid frame that opens out hydraulically on site to several times its transport footprint. For a school it is interesting for three reasons — it is delivered rather than built, it is insulated so it can be used through a school year rather than a season, and it can be moved or sold if the requirement changes.
The verified specification for the platform is worth comparing directly against your requirement. Expansion is hydraulic on both sides — not a manual push-pull system — and a two-person team can complete the full opening in roughly 30 minutes. Expanded usable floor area ranges from 96 m² to 235 m² depending on model. Interior clear height is approximately 3.8 m and above, exterior height can be customised to around 4 m, and transport width is approximately 2.55 m depending on configuration. Walls and roof are insulated with 50 mm polyurethane (PU) sandwich panels, which reduces the heating and cooling load compared with an uninsulated tent. Interior materials are B2 fire-retardant rated. The frame is national-standard Q235 / Q345 manganese square steel, and the roof carries approximately 300 kg/m². CE documentation can be provided, and the same platform is quoted as expandable trailers for sale with or without a road chassis, which matters if the unit will be sited once and left in place.
What a supplier should be asked to put in writing for a school project, and what this category of structure does not solve by itself: the anchoring or tie-down method for your ground and exposure, with the structural information your engineer needs; the floor construction and its point-load behaviour under servery equipment; fire egress door positions and swing direction for the occupancy you intend; the electrical specification and whether it matches your supply; ventilation and heat extraction if hot food is prepared inside; and the connection points for water, waste and wash-up. Wind performance figures in particular should come as a confirmed, site-specific statement from the factory rather than a headline number — the factory's figure is experience-based, and the anchoring requirement on your site is what actually protects the pupils using the room.
Written answers to these, from every supplier you shortlist, give you a comparison that is worth something:
Units on this platform are quoted between USD 59,000 and 140,000 depending on size, insulation package, electrical standard, interior fit-out and whether a road chassis is supplied. That is a configuration-dependent range rather than a price list, and any quotation should state what it includes and on what date it applies. Structural steel, panel and transport costs move, so a quote from last year is not a quote.
Before you present a number to a governing body, build the total against the alternative:
Two things to resist: a payback promise, and a comparison that puts a purchase price against a construction total without the ground works, connections and fit-out on the equipment side. Ask for both sides to be stated on the same basis, including what is excluded.
The school, trust or authority remains the duty holder. That does not change because the room arrived on a lorry. In practice the split is:
Get the intended occupancy and use described clearly at the start, in writing, and copy it into every quotation you request. Suppliers cannot answer a compliance question they have not been given the actual use for, and the most expensive mistakes in school projects come from a structure specified for a seating capacity that nobody had agreed with the authority.
A school that does those six steps usually finds the choice is simpler than it looked. The difficult part is not the structure; it is writing down what the room is for, and getting that description agreed by everyone who has to sign it off.
If you are working through a dining or multi-use space requirement and want the drawings and specification of the expandable platform against your own pupil numbers, email [email protected] with the seated number per sitting, the site access constraints and whether the unit will be towed on the road or sited permanently. You can also reach the sales team on WhatsApp: +86 186 6381 3961, or see the full range at www.lgloader.com.
