Used 20ft Shipping Container (Dry): Uses, Modifications and Fit-Out Options

Introduction: the used 20ft Dry container, a versatile piece of equipment

The used 20ft Dry shipping container is a widely used storage and transport unit, valued for its robustness and modularity. It is an ISO Dry container, meaning it has no refrigeration or active ventilation system, and is designed for transporting and storing dry goods. Its one-piece Corten steel structure and 28 mm marine plywood floor give it high mechanical strength and good weather resistance. This used model is inspected and leak-tested, with a Wind & Watertight guarantee: door seals, welds and structure are checked to limit air and water ingress. With an internal volume of around 33 m³, it offers substantial storage space while remaining compatible with international handling and transport standards.

Whether you are a construction professional, manufacturer, farmer or individual, the used 20ft Dry container can meet many needs. This guide details its technical specifications, uses, possible modifications and fit-outs, as well as key checks for an informed purchase.

Technical specifications of the 20ft Dry container

Technically, a 20ft Dry container complies with ISO 668 and ISO 1496 standard dimensions. Its usual external dimensions are about 6.06 m long, 2.44 m wide and 2.59 m high. Internal dimensions are around 5.90 m long, 2.35 m wide and 2.39 m high, giving a usable volume of nearly 33 m³. Tare weight is generally between 2,200 and 2,400 kg depending on the manufacturer and reinforcements. Maximum payload is commonly around 28,000 kg, but depends on the actual tare weight and transport limitations.

The 28 mm marine plywood floor is fixed to steel cross members; it supports rolling or point loads within the manufacturer's intended limits. The side walls and roof are corrugated steel sheet, which contributes to the rigidity of the assembly. The double rear doors are fitted with container locks (locking bars, handles, cams) and rubber seals. These seals are wearing parts: their condition determines air and water tightness. A refurbished used container should have flexible seals, free from cracks or tears, and functional locking mechanisms.

Corten steel, also known as weathering steel, is a low-alloy steel that develops a protective oxide layer on its surface when exposed to air. This characteristic slows corrosion and explains why this material is used for shipping containers. However, this does not mean a container is indestructible: deep scratches, impacts and water-retention areas can promote rust. That is why periodic maintenance is recommended, especially on edges, lower walls and around the floor.

Common uses of the used 20ft Dry container

The used 20ft Dry container is suitable for many uses. For static storage, it secures equipment, archives, tools, furniture or various goods. Its closed, lockable design provides weather protection and a deterrent physical barrier. On a construction site, it can serve as a technical room or tool store, provided applicable safety and fit-out rules are checked. For export, it remains a standardised transport method, compatible with container ships, trains and trucks. It can also be converted into a site office, fitted storage room or modular housing base, but these conversions must comply with current construction, insulation and safety rules. In all cases, ventilation is advisable if the container is occupied or stores moisture-sensitive products.

In construction

The 20ft container serves as a tool store, changing room or break room, with simple fit-outs (shelving, lighting, ventilation).

In industry and logistics

It provides rapid storage expansion, placed on a stabilised area, for parts, consumables or archives.

In events

It can become a sales point, stand or technical room, with suitable decoration.

In agriculture

It houses small equipment, seeds or packaged products, provided humidity is controlled.

For individuals

It offers storage space for furniture, garden tools, bikes or seasonal equipment. In all these cases, the 20ft's modularity is an asset: it can be moved, stacked (within the limits intended by the structure and corner fittings) and combined with other modules. However, stacking used containers is not advisable without checking their structural condition and using compliant corner fittings.

Possible modifications and fit-outs

The used 20ft Dry container can be modified to meet specific needs. Here are the most common fit-outs, with their technical requirements.

Site office or welfare room

A container can be fitted out as a site office or welfare room (changing room, canteen). This generally involves:

• Thermal and acoustic insulation (mineral wool, rigid panels) for optimal comfort.
• Mechanical or natural ventilation to renew air and prevent condensation.
• Electrical installation compliant with NF C 15-100, with panel, sockets and lighting.
• Floor covering (linoleum, carpet) and lightweight partitions to separate areas.
• Openings (doors, windows) to be created while respecting the structure and sealing.

These modifications must comply with fire safety and accessibility rules for the intended use.

Fitted storage room

For optimised storage, shelving, racks, lighting or even air conditioning for sensitive products can be added. Ventilation is often necessary to limit humidity. The floor can be reinforced if heavy loads are stored.

Modular housing or studio

Converting a container into housing requires thorough study: reinforced insulation, high-performance joinery, heating system, drinking water, wastewater drainage, electricity. Planning rules apply (prior declaration or building permit). It is recommended to use professionals to ensure compliance and durability.

Sales point or event space

The container can be customised (paint, wood cladding, signage) to create a pop-up sales point or stand. The interior fit-out must be modular and secure.

Workshop or technical room

For a workshop, provide ventilation suited to fumes, a reinforced electrical installation and a resistant floor. Openings for air extraction and cable routing are necessary.

In all cases, it is essential to check technical feasibility (openings, reinforcements) and comply with current standards. A used container can be modified, but its structural condition must be sound.

Key checks when buying a used container

When buying a used container, several points deserve particular attention. First, check the general condition of the structure: presence of holes, major deformations, perforating rust or non-compliant repairs. Doors must open and close without forcing, seals must be flexible and complete, and locks must work correctly. The floor must not show rotten areas, delamination or holes. A leak test can be carried out visually or with water, but the Wind & Watertight guarantee announced by the seller must be specified contractually. It is also useful to request the CSC (Convention for Safe Containers) marking and identification plates, which attest to the container's compliance for transport. For static use, these requirements may be less strict, but they remain a quality indicator.

Transport and handling

Transporting and handling a 20ft container requires suitable equipment. A truck with auxiliary crane, a forklift with sufficient capacity or a reach stacker can be used. Lifting points are the four top and bottom corners, fitted with standard corner castings. It is essential never to lift a container by its walls or roof. The total weight (container plus load) must comply with French road limitations. In France, road freight transport is governed by the Highway Code and regulations on weights and dimensions. For a 20ft container, the authorised gross vehicle weight depends on the vehicle and trailer type. Exceptional transport may be necessary if dimensions or weight exceed regulatory thresholds. It is recommended to use a specialist carrier and check necessary permits.

Installation and maintenance

Ground installation must be carefully considered. A container can be placed on concrete blocks, hardwood beams or slabs, to avoid direct contact with the ground and limit humidity. A slight slope can facilitate water drainage. If the container is to remain in place, anchors can be provided to resist wind, especially in exposed areas. For housing or office use, insulation, ventilation, electricity and interior fit-out must be considered, complying with construction and safety standards. These modifications may require planning permission depending on the intended use and duration of installation.

Routine maintenance of a used container includes cleaning the floor and walls, checking seals, lubricating locking mechanisms and inspecting rust spots. It is advisable to treat any scratch or paint chip quickly to prevent corrosion spread. Door seals can be replaced when they harden or crack. A well-maintained container can serve for many years, whether for storage or a more specific use. Finally, it is useful to keep purchase documents and any inspection certificates, especially for export or later resale.

Comparison with other container formats

Compared to other formats, the 20ft has advantages and limits. Against the 40ft, it is more manoeuvrable, easier to transport and place on tight sites; it weighs less empty and can be moved by more common equipment. However, it offers about half the volume, which may require several units for large needs. Against the 10ft, it offers significantly more volume while remaining transportable on a standard truck, whereas the 10ft is often used for very constrained spaces. The 20ft High Cube offers about 30 cm more internal height, useful for taller volumes or fit-outs, but it is less common used and may be more expensive. The Open Top container, without a rigid roof, facilitates top loading of tall or heavy items, while the Flat Rack, without side walls, suits out-of-gauge loads. The Reefer container, finally, is fitted with a refrigeration unit and intended for perishable goods; it is heavier, more expensive and requires a power supply. The 20ft Dry therefore remains the most standard and economical choice for storing and transporting dry goods.

Conclusion

The used 20ft Dry container is therefore a versatile and economical solution, suitable for many needs. Its ISO standardisation ensures compatibility with global transport infrastructure, while its Corten steel structure and marine plywood floor offer proven resistance. Refurbished and watertight, it is a reliable base for storage, construction or export. As with any used equipment, the actual condition of the container and warranty terms must be checked with the seller. An informed purchase, with careful inspection and regular maintenance, allows you to get the most out of this container over the long term.