40ft Standard Container

excl. VAT · incl. VAT: €4,104.31

The case for a 40ft standard container is mostly arithmetic

A 40ft standard container is bought for one reason above all others: it is the cheapest enclosed, lockable, weatherproof cubic metre you can put on a yard. At 67.7 m³ it holds roughly twice the volume of a twenty foot box, but it does not cost twice as much to buy, it does not cost twice as much to deliver, and it does not need twice the paperwork or twice the ground preparation. That is the whole commercial argument, and it is a strong one, provided the site can actually take twelve metres of steel.

The rest of this page is about that proviso. Volume per euro is easy to calculate. Getting a 12.192 m box through a gate, around a corner and onto level bearing points is the part that decides whether the sum was worth doing. So below you will find the verified specification, an honest look at the weight trade off against smaller boxes, an explanation of the listed build features, and a realistic account of what transport and access require.

Verified dimensions and weights

Internal dimensions are not recorded for this unit. If your project depends on clear internal length, width or height, for example a racking run, a vehicle stored inside, or a fit out, ask for those measurements to be taken on the specific container being offered rather than working from a generic table.

Volume per euro, and where the saving comes from

Two twenty foot boxes give you two door ends, two sets of locking gear, two placements to organise and two lots of ground preparation. One forty foot box gives you a single continuous space of 67.7 m³, one delivery, one set of corners to level and one door end to secure. For anything that benefits from an uninterrupted run, long timber, pipe, ducting, extrusions, scaffold, racking down both walls with a clear aisle between them, the single long box is not just cheaper per cubic metre, it is more usable per cubic metre.

The saving is real but it is not unlimited, and it comes with three conditions. The site must have room. The delivery must be feasible. And you must genuinely need the volume, because an under filled forty foot box is a worse buy than a well filled twenty foot one.

The weight trade off nobody mentions

Here is a detail that surprises buyers. The tare weight is 3,750 kg and the payload is 26,730 kg. Compare that payload against what two shorter boxes would carry between them and the long box comes out behind. The reason is structural. A longer floor spans further between supports, and the certified gross figure has to account for that span rather than simply doubling.

In practice this rarely constrains storage use, because most yards run out of volume long before they run out of permitted mass. It matters if you are storing something genuinely dense across the whole floor, such as aggregate in bags, fixings, tooling, tile or metal stock. In those cases plan by weight, distribute the load along the length rather than concentrating it in the middle, and do not assume that a box twice as long carries twice as much.

What the listed build features actually mean

The specification for this unit lists Corten steel construction, wind and watertight, ISO 668 compliant, lockable cargo doors, reinforced corner castings, heavy duty flooring and multi point door locking. Those phrases are worth unpacking, because each one describes something you will notice in use.

• Corten steel construction. Weathering steel forms a tightly adhering oxide layer where the coating is broken, which slows further corrosion instead of allowing it to sheet away as it does on plain mild steel. It is the reason container walls survive decades of salt air.
• Wind and watertight. The box excludes weather at the roof, seams and door seals. Note that this describes weather exclusion, not vapour control. Condensation inside an uninsulated steel box is a separate matter and is managed by ventilation and storage practice.
• ISO 668 compliant. That standard governs the external dimensions, corner fitting positions and classification of freight containers. It is what makes the box interchangeable worldwide: any compliant chassis, spreader, stacking frame or lashing system will fit it.
• Reinforced corner castings. The eight castings carry every lift and every stacked load. They are the interface with cranes, spreaders and twist locks, and their condition is what determines whether the box can be safely handled.
• Heavy duty flooring on steel cross members, which is what permits a pallet truck or a small forklift to operate inside rather than requiring everything to be handled by hand.
• Multi point door locking. The vertical bars engage cams top and bottom, so each door leaf is held at several points rather than one. That is both a weather seal benefit and a security benefit, since there is no single point to attack.

Getting twelve metres onto your site

This is the part to settle before anything else. A 12.192 m box is delivered on a vehicle longer than itself, and the vehicle needs to arrive, position, place and leave. Work through the route in this order.

First, the approach road and the entrance. A long rigid or articulated vehicle needs a wide swept path to turn in, and the swept path is considerably wider than the vehicle. Gateposts, kerbs, bollards, parked cars and street furniture all reduce it. Second, overhead clearance for the full route, not only at the gate. The box is 2.591 m tall, but during a crane lift the load sits far higher, so cables, branches, canopies and height barriers all matter. Third, the standing position. A lorry mounted crane must deploy stabiliser legs onto ground that will not sink, and it needs to reach across to the final position. Fourth, the exit. A vehicle that cannot turn round has to reverse the whole route, which on a constrained site is sometimes impossible.

If any of this is doubtful, say so when requesting the quotation and describe the site honestly. Surfaces, gradients, gate widths and overhead obstructions all change the method and the price. A tilt bed delivery, for example, needs a long straight run behind the vehicle and reasonably level ground, and it will not work where a crane lift over a wall would.

Levelling a long box

Any container is supported at its corner castings, and on a long unit the span between them is what makes levelling critical. If one corner sits low the frame twists along its length, and the first symptom is doors that need lifting or leaning on. Left uncorrected, a twisted frame stresses the door seals and lets water in.

Use four solid bearing points as a minimum, set genuinely level with one another rather than approximately. Where the ground is soft or made up, intermediate supports along the length help spread the load and reduce deflection of the bottom rails, particularly if the box will carry a heavy distributed load. Keep the underside clear of standing water and vegetation so that air can move and the cross members stay dry.

One door end changes the layout

A standard dry box has cargo doors at one end only. Over a twelve metre length that has practical consequences. Anything stored at the far end is twelve metres from the opening, so plan the layout around access frequency: fast moving goods near the doors, slow moving stock at the back. Racking down both long walls with a central aisle works well and keeps everything reachable. Lighting matters more than in a short box, because natural light from the doors does not reach the far wall.

If you regularly need access along the length, that is worth raising early. It changes which container type suits you, and it is a much cheaper conversation before purchase than after placement.

When a 40ft is the wrong answer

Be honest about three situations. If access is genuinely tight, two shorter boxes will very often cost less in total than one long box plus the special measures needed to deliver it. If you expect to move the unit around a site, a long box is far less agile. And if you need the space in stages rather than all at once, buying smaller and adding later spreads the outlay and gives you flexibility on layout.

Where none of those apply, and there is space to place and to load it, the 40ft standard container remains the most cost effective large storage unit available, and it is equally at home as the shell for a workshop, a store or a larger conversion. Compare it against a high cube version if internal height matters, and against a used long box if budget is the driver, but compare on delivered cost and on realistically usable volume rather than on headline price alone.

Is a 40ft standard container better value than two 20ft boxes?

Usually yes on cost per cubic metre, because you pay for one delivery, one door end and one set of bearing points instead of two. It is also more usable for long goods. The exceptions are tight access, where the special measures needed to deliver twelve metres can outweigh the saving, and situations where you need the space in stages.

Why is the payload not double that of a 20ft container?

The tare weight is 3,750 kg and the payload is 26,730 kg, which is less than two shorter boxes would carry between them. The reason is structural: a longer floor spans further between its corner supports, so the certified figures account for that span rather than simply doubling. For dense goods, plan by weight and distribute the load along the length.

What access do I need for delivery?

The vehicle is longer than the 12.192 m box and needs a wide swept path to turn in, clear overhead height along the whole route, firm ground for stabiliser legs if a crane is used, and a way to leave again. Describe surfaces, gradients, gate widths and overhead obstructions when requesting a quotation, because they change both method and price.

What does ISO 668 compliant mean?

ISO 668 is the standard governing the external dimensions, corner fitting positions and classification of freight containers. Compliance is what makes the box interchangeable worldwide, so any standard chassis, spreader, stacking frame or twist lock system will fit it. It describes the container, not the seller, and it is a dimensional and classification standard rather than a quality mark.

How should the container be supported?

On four solid bearing points under the corner castings, set genuinely level with one another. Over a twelve metre span a low corner twists the frame, which first shows as stiff doors and eventually stresses the seals. On soft or made up ground, intermediate supports along the length help. Keep the underside clear of standing water and vegetation.