Size Guide

The right container size depends on the goods, the site, and the length of use. A container that is too small creates loading problems, poor access, and inefficient storage. A container that is too large can increase delivery difficulty, take up valuable space, and be harder to relocate or collect.

List what you need to store or fit inside before choosing a size. Think about length, width, height, weight, packaging, racking, pallets, door access, handling equipment, and how often goods will be moved.

Also check the site. A container may have enough internal space for your goods but still be unsuitable if the delivery vehicle cannot reach the placement area safely.

Common container sizes in the UK

Most standard shipping containers are around 8ft wide externally. Standard height is usually around 8 ft 6 in externally, while a high cube container is usually around 9 ft 6 in externally. Internal dimensions vary by container type, manufacturer, lining, insulation, floor, and modifications, so check the exact specification before ordering.

Common lengths include 8ft, 10ft, 20ft, and 40ft. Smaller containers are useful where access and footprint are limited. Larger containers offer more internal volume but need more delivery space and more careful site planning.

For many buyers and hirers, the main decision is between a 20ft and a 40ft container. A 20ft unit is often easier to place on construction sites, farms, schools, sports clubs, and domestic sites. A 40ft unit is better where long items, larger stock volumes, or bulk storage are the priority, and the site can accept the extra length.

8ft and 10ft containers

8ft and 10ft containers can suit restricted sites, domestic storage, clubs, small workshops, event storage, tools, sports equipment, and smaller business stock. They can be useful where a larger vehicle or longer container would create access problems.

These compact units are not always the cheapest option in proportion to their capacity because smaller specialist sizes may have different availability and handling requirements. They are best chosen for access or footprint reasons rather than maximum storage efficiency.

Check door-opening space carefully. A compact container still needs room in front of the doors for safe loading, unloading, and lock operation.

20ft containers

A 20ft container is a common general-purpose choice for storage and hire. It can suit building sites, farms, schools, sports clubs, retailers, industrial yards, household storage, tools, machinery, parts, and business overflow stock.

It is often easier to deliver and position than a 40ft container, especially on sites with tighter gates, shorter yards, parked vehicles, or limited turning room. It can also be easier to organise internally because users do not need to travel as far to reach the rear.

For many projects, a 20ft container gives the best balance between useful capacity, delivery practicality, and site footprint. See 20ft shipping containers and 20ft shipping container hire.

40ft containers

A 40ft container provides much more length and volume. It can suit bulk stock, agricultural equipment, industrial storage, long materials, larger furniture storage, vehicle-related storage, and sites that need one large unit rather than several smaller units.

The extra length needs more planning. Delivery usually requires more road space, turning room, final placement length, and clear access. A 40ft unit may not be suitable for many domestic driveways, narrow lanes, tight construction sites, or sites with limited lifting space.

Internal layout also matters. If frequently used goods are stored at the back, access can become inefficient. Racking, walkways, loading order, lighting, and door orientation should be planned before delivery. See 40ft shipping containers and 40ft shipping container hire.

Standard height or high cube?

A high-cube container provides extra height compared with a standard-height unit. This can help with taller goods, racking, machinery, workshop use, or conversions where insulation and lining reduce internal headroom.

Extra height can also create delivery and planning considerations. Check overhead cables, branches, building eaves, entrances, doors, and route restrictions. The extra height is useful only if your goods or layout benefit from it.

For offices, gyms, workshops, and insulated spaces, high-cube units may improve comfort once floors, ceilings, lighting, and insulation are fitted. For simple low-level storage, a standard-height unit may be enough.

Specialist container types

Standard dry containers are suitable for many storage uses. Other container types may be better where the cargo, loading method, or working environment needs a different design.

• Refrigerated containers: used for temperature-controlled storage when connected to a suitable power supply.
• Open-top containers: useful where goods need to be loaded from above using a crane or other lifting equipment.
• Flat rack containers are used for oversized or awkward cargo rather than enclosed storage.
• Modified containers can include doors, windows, vents, linings, insulation, electrical systems, racking, offices, or workshops.
• High-cube containers: useful when extra internal height is required for goods, racking, or conversion work.

Useful options include 20ft refrigerated containers, 20ft open-top containers, and flat rack containers.

Buying or hiring by size

Hire can suit short-term storage, building projects, events, renovations, seasonal stock, and temporary site use. Buying can suit long-term storage, repeated use, modifications, branding, workshops, offices, and export packing.

Size affects the decision. A hired container must remain accessible for collection, so do not place it where later scaffolding, fencing, landscaping, materials, or parked vehicles will block removal. A purchased container gives more freedom, but you still need to plan delivery, maintenance, and possible future relocation.

Hired containers should not be drilled, welded, cut, painted, moved, stacked, permanently connected, or modified without prior agreement. Compare broad options through container sales and container hire.

Condition grades and size selection

Condition should match the size and intended use. A one-trip container is a new or near-new unit that has usually carried cargo once before release for sale or hire. It is often chosen for visible sites, long-term ownership, self-storage, offices, workshops, and conversions.

A used wind and watertight container can suit practical storage where dents, surface rust, faded paint, and old markings are acceptable. Wind and watertight means the container should keep out normal wind and rain when the roof, walls, doors, and seals are serviceable.

Cargo-worthy, IICL, and CSC-plated containers may be relevant where the unit is used for cargo movement or export. Do not assume a storage-grade container is suitable for international transport without checks.

Loading, access and internal layout

Measure the goods, not just the empty space. Long goods may need a 40ft unit. Heavy goods may need careful floor loading and access planning. Palletised goods may need door clearance, forklift access, pallet truck access, or space for manual handling.

Racking can improve storage density but may reduce aisle width. Lining and insulation reduce internal width and height. Office or workshop conversions may require space for desks, benches, electrical systems, heating, ventilation, and safe movement.

Leave room for the doors to open fully and for people to load safely. A container placed too close to a wall, fence, hedge, bank, garage, or parked vehicle area may be difficult to use even if it fits the site.

Delivery access and placement

Container size directly affects delivery. Most containers are delivered by a heavy goods vehicle, and many placements use a HIAB. A HIAB is a lorry-mounted crane used to lift the container from the vehicle and place it nearby.

Check the route from the public road to the final position. Look for narrow gates, tight turns, parked vehicles, slopes, soft ground, drains, manholes, underground services, overhead cables, low branches, building eaves, scaffolding, signs, and lighting columns.

The placement area should be firm, level, and well-drained. Uneven support can twist the frame and make the doors hard to open, close, or lock. For general UK lorry context, see the official guide to lorry types and weights. For practical planning, see container delivery.

Export and transport considerations

If the container will be used for export, size choice affects cargo planning, load securing, weight distribution, documentation, and carrier acceptance. A container that works well for static storage is not automatically suitable for cargo movement.

Export use may require cargo-worthy condition, valid CSC status, customs clearance, VAT, duty, commodity codes, commercial invoices, packing lists, insurance, and freight forwarder input. Container size should be checked against the cargo, route, equipment, and destination requirements.

Incoterms 2020 are trade terms published by the International Chamber of Commerce that define the responsibilities between the buyer and the seller. Acorn Containers can advise on container suitability and delivery planning, but legal, tax, customs, insurance, and trade compliance matters should be checked with the relevant authority, freight forwarder, customs agent, insurer, or trade adviser. For background, see Incoterms 2020, trade.gov.uk, and bifa.org.

Information to provide before requesting a size recommendation

Clear information helps Acorn Containers recommend a size that fits both the goods and the site.

• Confirm whether you want to buy, hire, or compare both options.
• List the goods being stored, including length, width, height, weight, packaging, and value.
• Confirm whether goods are moisture-sensitive, high value, hazardous, refrigerated, insured, or customer-owned.
• State whether you need 8ft, 10ft, 20ft, 40ft, high cube, refrigerated, open top, flat rack, or modified options.
• Explain whether the unit will be used for storage, office, workshop, construction, retail, farm, domestic, self-storage, or export.
• List racking, shelving, lining, insulation, vents, electrics, lockbox, personnel doors, or window requirements.
• Provide the delivery postcode, full address, site contact, and preferred placement position.
• Describe access, gate widths, turning space, ground surface, slopes, drains, manholes, and overhead obstructions.
• Confirm whether the container may need to be relocated or collected later.
• For export, provide cargo, destination, loading method, freight forwarder details, and documentation requirements.