Two very different products land on the same UK shortlist whenever cold storage is the goal: a refrigerated shipping container, and a purpose-built modular cold room assembled from insulated panels. Both hold commercial temperatures, chilled or frozen, so the choice is almost never about cold itself. It turns on lead time, groundwork, permits, where the unit is allowed to stand, and what you can do with it the day the need changes. Here is the split, criterion by criterion, ex VAT.
Two answers to the same need
A refrigerated container is a finished ISO unit. The insulation, the refrigeration group and the sealed steel shell arrive together: a 20ft gives roughly 28 m³ inside, about 5.44 x 2.29 x 2.27 m, and a 40ft high cube about 67 m³ with 2.55 m of interior height. You pick a size and a condition grade, it is sited, and it runs across -25 °C to +25 °C in standard form.
A modular cold room is built where it will live, from insulated panels cut to your space. That made-to-measure fit is its strength and its price: the panels are ordered to size, the floor prepared, and the room takes days of fitting labour inside a space you already hold.
Head to head
The container figures below are indicative UK brackets observed in 2026, quoted ex VAT (add 20%); they move with region, season and supplier. Modular cold rooms are priced bespoke, so that column stays qualitative.
| Criterion | Refrigerated container | Modular cold room |
|---|---|---|
| Lead time | Arrives built; craned onto its base in a single morning | Panels cut to size, then built on site over days |
| Price (ex VAT) | Used £4,500-7,500; new one-trip £18,995-22,500; hire from ~£12/day | Quoted bespoke by floor area, insulation and refrigeration |
| Groundwork | Level, load-bearing base and a three-phase supply | Prepared slab, drainage, indoor space and fitting labour |
| Permits | Often treated as temporary or movable, check locally | Fixed fit-out or structure, rules differ by authority |
| Outdoor siting | Weatherproof steel shell, designed to stand outside | Usually built indoors or under a covered shell |
| Resale | Standard ISO unit, movable, established used market | Bespoke build, hard to relocate or resell |
Lead time and groundwork
This is where the container pulls ahead for most buyers. It is already built, so putting it in place is a delivery job rather than a construction one. A level, load-bearing base and a three-phase supply, typically a five-pin 32 A CEE socket at 380/400 V, are enough, and the crane lorry sets it down in a single morning. The refrigeration group, from a familiar name such as Carrier, Thermo King, Daikin or Star Cool, holds its set point straight away.
A modular cold room asks more of the site first. You need a prepared, level slab, drainage, an indoor volume to build into, and time for the panels to go up and be sealed. None of it is exotic, but it is genuine building work, and it is the main reason the two rarely finish level once groundwork is counted in.
Price and running cost
On price, the container is the one you can read off a list. A used unit graded A, B or C runs £4,500 to £7,500 ex VAT, a new one-trip £18,995 to £22,500, and long-term hire starts around £12 a day ex VAT, with a 90-day minimum common at many suppliers and shorter terms available at some. Running cost is the line nobody prints: reckon on 70 to 170 kWh a day depending on size and set point, billed at your contracted unit rate.
A modular cold room carries no shelf price. It is quoted bespoke by floor area, insulation thickness and refrigeration, so the only fair comparison is total installed cost with groundwork included, not a headline number. If the need is genuinely permanent, past roughly 18 to 24 months of continuous use, buying a container tends to beat hiring; the for-sale pages walk through grades and the recent PTI (Pre-Trip Inspection) worth asking to see.
Permits and standing outside
Because a container is movable and often treated as temporary, some sitings are simpler than a permanent build, though the rules vary by local authority, so confirm with your council before you order. A modular cold room is a fixed fit-out and is judged differently. One point worth clearing up while you check: a container standing still on your yard as a store is not the same as ATP-certified transport, which concerns refrigerated goods in transit. A static store is generally outside its scope, though any sanitary or planning rules for your site are worth raising with the relevant authority.
Outdoors is the other clean split. The container’s shell is made for weeks at sea, so it is happy in the open on its base. A modular cold room usually needs to live inside, or under a shell built for it, which quietly loads the total.
Which should you choose?
Pick the container when you want cold storage that is quick to site, can stand outdoors, comes with a price you can see, and stays a movable asset you can sell on: a sound ISO reefer holds an established used market and 10 to 15 years of service life. Pick the modular cold room when the space is fixed, indoors and awkwardly shaped, and a made-to-measure fit matters more than speed, mobility or resale.
If you land in the container column, putting suppliers side by side is what pays. Browse the other comparisons for size, temperature and grade, and when your need is clear, request your quotes: we pass your request to specialist suppliers, who contact you directly if they can meet your requirement.
Frequently asked questions
How quickly can each one be up and running?
They work on completely different clocks. A refrigerated container turns up already built, so siting it is a delivery-and-crane job that a level base and a three-phase supply can finish in a single morning. A modular cold room is assembled where it will stand, from panels cut to size, and that takes days of fitting labour on a prepared floor once the slab and drainage are ready.
Do I need planning permission for a container cold store?
It depends on your local authority and how the unit is used. Because a container is movable and often treated as temporary, some sitings are simpler than a permanent structure, but this is not a universal rule. Confirm with your council before you order, treat any general guidance as a starting point rather than a ruling, and ask about drainage and sanitary rules if you will store food.
Can a modular cold room stand outside like a container?
A container can, and a cold room usually cannot without help. The container's steel shell is built for weeks at sea, so it is designed to stand outdoors on a level base with a three-phase feed. A modular cold room is normally assembled inside an existing building, or needs its own covered shell put up around it, which is a large part of why the two diverge so sharply on groundwork.
Which is easier to sell on later?
The container, comfortably. A standard ISO reefer is a recognised unit with an established used market, so it can be lifted onto a lorry and sold, with 10 to 15 years of service life in a sound one. A modular cold room is bespoke and bonded to its site, so relocating or reselling it is difficult and rarely recovers much. If resale matters, that gap is decisive.