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

Why choose a used 20ft Dry shipping container?

The used 20ft Dry shipping container is a robust, standardised and affordable storage and transport solution. Its design, based on ISO 668 and ISO 1496 standards, allows it to be handled, stacked and transported across maritime, rail and road networks. Inspected and certified Wind & Watertight, it offers a cost-effective alternative to new while retaining essential features: Corten steel structure, 28 mm marine plywood floor, double rear doors with locking bars. With an internal volume of around 33 m³ and a floor area of 13.8 m², it meets many professional and private needs.

This type of container is particularly popular for its value for money. A refurbished used unit provides access to durable equipment without the cost of a new container, while benefiting from verified watertightness. Whether for storing equipment, shipping goods or fitting out a workspace, the 20ft Dry adapts to a wide range of contexts.

Common uses of a used 20ft Dry container

Static storage: versatility above all

Static storage is the most common use. Its watertight, lockable design protects contents from rain, dust and intrusion. It is found on construction sites as a tool store, in businesses for archiving documents, in agriculture for storing seeds or fertiliser, or with individuals to free up a garage. Its compact size (6.058 m long) makes it easy to install in small spaces while offering generous capacity.

The strength of Corten steel and marine plywood flooring allows it to support heavy loads (up to around 28,000 kg payload) and frequent handling. A well-maintained container can serve for decades in static storage, making it a rational investment.

Transport and export: reassuring compliance

Thanks to its CSC plate and ISO compliance, the used 20ft Dry container can be used for sea, rail or road transport. It is ideal for exporting palletised goods, particularly to destinations requiring a standard format. Its compatibility with container trucks and trailers avoids special abnormal load permits in most cases.

For export use, it is essential to check that the CSC plate is valid and that the container has no leaks. Careful inspection of seals and structure ensures goods arrive safely without damage.

Light fit-out: office, workshop, technical room

The 20ft Dry container can be converted into a site office, workshop, secure storage room or basic welfare unit. However, these fit-outs require specific work: insulation, electricity, ventilation, sometimes cutting openings. An unmodified container is not designed for permanent habitation without suitable fit-out, due in particular to possible condensation and insufficient natural ventilation.

For regular use, it is advisable to provide ventilation, anti-corrosion treatment and a roof watertightness check. Thermal insulation is often necessary for optimal comfort: an uninsulated container is strongly affected by temperature variations.

Possible modifications and fit-outs

Insulation and thermal comfort

Insulation is the first modification to consider for prolonged use. It can be done with rigid panels (rock wool, polystyrene, polyurethane) or spray foam. Full insulation with ventilation and heating is necessary for an office or workshop. Care must be taken not to create thermal bridges and to preserve the original watertightness.

Ventilation is crucial to prevent condensation. Installing high and low vents allows natural air circulation. For intensive use, a mechanical ventilation system can be considered.

Electricity and lighting

Electrical fit-out must comply with safety standards. It is advisable to use a qualified electrician to install the panel, sockets, lighting and possibly heating. Cables must be mechanically protected and circuits adapted to the required power. Low-consumption LED lighting is often preferred.

Openings: doors, windows, glazed panels

Adding windows or glazed panels improves comfort and natural light. These modifications must be carried out carefully so as not to compromise the structure. It is recommended to reinforce frames and treat joints against corrosion. For an office, an additional door can facilitate access without having to open the double rear doors.

Partitioning and interior fit-out

Partitioning allows several spaces to be created (office, storage, sanitary). Light partitions in particleboard or plasterboard can be mounted on a metal frame. The existing marine plywood floor can be covered with a suitable surface (PVC, carpet, resin) depending on use.

Roof and weather protection

For an outdoor fit-out, it may be useful to add an over-roof or awning to limit direct sunlight and infiltration. Regular anti-corrosion treatment of the roof and walls extends the container's lifespan.

Key checks before buying

Structural inspection

Before buying a used container, carefully examine the structure: perforating rust, major deformation, cracked welds. The floor must be inspected: soft or delaminated areas may indicate water ingress. Door seals must be flexible and uncut, and locking bars must close properly.

Watertightness check

The Wind & Watertight label guarantees tested watertightness, but a visual check remains essential. A simple test is to check the condition of the seals and ensure the doors close tightly. The CSC plate must be present and valid for international sea transport.

Origin and history

The container's history (previous use, number of voyages) can give indications of its condition, but does not replace a careful examination. Ask for recent photos of the corners, roof, floor and doors. An on-site visit is ideal to assess the actual condition.

Ground preparation and installation

A loaded 20ft container can weigh several tonnes. It is essential to provide a stable, level support: concrete blocks, hardwood beams or load-spreading slabs. Soft or sloping ground can cause deformation and difficulty closing doors. Also consider accessibility for the delivery truck and the clearance needed to operate the double doors.

Once positioned, the container must be shimmed and checked: opening and closing the doors must remain easy, indicating the structure is not stressed. If the container remains in place, periodic checking of flatness and absence of corrosion at the bottom rails is recommended.

Maintenance and longevity

Maintaining a used 20ft container is simple but regular. Visually check the condition of paint and seals at least once a year. Rubber seals can harden or crack; replacing them is inexpensive and preserves watertightness. The floor must be kept clean and dry; in case of oil or chemical stains, quick cleaning prevents impregnation. Periodically lubricate hinges and locking bars.

If the container is stored outdoors, slightly raising it on blocks or beams avoids direct contact with the ground and limits corrosion of the base. By the sea, rinsing with fresh water and more frequent paint checks are recommended. In industrial areas, periodic cleaning is generally sufficient.

Comparison with other container types

The 20ft Dry stands out for its compactness and versatility. The 40ft Dry offers around 67 m³ and an internal length of about 12 m, but it is heavier and bulkier. The 40ft High Cube gains about 30 cm of internal height, valuable for bulky loads. The 10ft, rarer, is suited to small spaces. The 20ft High Cube combines the 20ft length with extra height. Open Top and Flat Rack containers are designed for specific loads. Reefers are equipped with a refrigeration unit. Finally, new containers offer superior watertightness and appearance, but at a significantly higher price.

Security and regulations

A closed container is a difficult space to break into, but it is not impregnable. Adding a quality padlock, or even a reinforced locking system, improves protection. For sensitive storage, a standalone alarm or motion-detection lighting can complement the setup. Do not store chemicals incompatible with steel or wood without precautions.

Regarding regulations, a standard 20ft container complies with maximum dimensions allowed for heavy goods vehicles without special dispensation. For export, it must comply with ISO standards and have a valid CSC plate. If the container is used as a site office, it may be subject to local planning rules, particularly if its installation exceeds a certain duration or is visible from the public highway. It is advisable to check with the local council before any permanent installation.

Environmental impact of reuse

Choosing a used container means extending the life of already-manufactured industrial equipment and avoiding the production of a new container. This approach is part of a circular economy logic, without compromising functionality. A well-maintained container can serve for decades in static storage, reducing the carbon footprint associated with manufacturing a new one.

Sector use cases: from construction to agriculture

The 20ft Dry container adapts to very different needs depending on the trade. In construction and public works, it is commonly used as a site store for sensitive tools, PPE, spare parts or consumables. Its lockable door and rigid structure limit the risk of theft and damage. Some companies install a workbench and lighting to create a mobile workshop.

In agriculture, it allows storage of seeds, fertiliser, small equipment or harvests sensitive to humidity. Winegrowers and producers see it as a solution for storing bottles, crates and cellar equipment, provided correct ventilation is arranged. In retail and distribution, it becomes a seasonal storage reserve or order preparation room, particularly during peak periods.

Construction tradespeople, landscapers, cleaning or maintenance companies find it a mobile storage room, movable with a truck or suitable forklift. Finally, individuals use it to free up a garage, store furniture, archives, light vehicles (motorcycle, quad, small equipment) or leisure equipment.

20ft or 40ft container: how to choose?

The choice between a 20ft and a 40ft depends above all on the volume to be stored and the space available. The 20ft offers around 33 m³, the 40ft around 67 m³. For domestic use or a small business, the 20ft is often sufficient and easier to install. For large volumes or grouped shipments, the 40ft is more suitable, but it requires a larger floor area and adequate truck access.

The 20ft also has the advantage of being lighter and more manoeuvrable. It can be moved with a standard-capacity forklift, making repositioning easier. The 40ft, heavier, requires more powerful lifting equipment. Finally, the price of a used 20ft is generally lower, making it a first choice for tight budgets.

Optimising interior space: storage and shelving

To make the most of the 33 m³, it is useful to install storage. Robust metal shelving, fixed to the walls or placed on the floor, allows vertical storage organisation. Pallets or stackable crates optimise volume. It is recommended to leave a central aisle to access goods and not to overload the floor beyond its capacity.

For archives or sensitive documents, metal cabinets or watertight plastic bins protect from residual humidity. A dehumidifier can be installed if the container is used for hygroscopic materials. Finally, interior lighting, even basic, improves ease of use.

Container and planning: what you need to know

Installing a container on private land may be subject to planning rules. In France, a container used as a storage room or office may be considered a construction and require prior declaration if its surface area or installation duration exceeds certain thresholds. It is prudent to consult the local urban plan (PLU) of your municipality and check with the planning department.

For temporary use (construction site), tolerances exist, but they vary between municipalities. An installation visible from the public highway may also be regulated. Anticipating these procedures avoids unpleasant surprises and risks of enforcement notices.

Delivery and handling: anticipating constraints

Delivery of a 20ft container requires a container truck equipped with a hydraulic arm or a high-capacity forklift. Access must be suitable for vehicles and the manoeuvring space sufficient. If access is difficult, transhipment onto a smaller truck or use of a mobile crane may be necessary. These operations must be anticipated with the carrier to avoid additional costs.

Once delivered, the container must be placed on a flat, stable surface. Correct shimming is essential to avoid deformation and ensure doors work properly. It is also recommended to check for stress after positioning by opening and closing the doors.

Conclusion

The used 20ft Dry shipping container is a robust, standardised and versatile product. It is suitable for both temporary and permanent storage and for transporting goods, and can serve as a base for light fit-outs. Its Corten steel, 28 mm marine plywood floor and doors with verified seals make it a rational investment for professionals and individuals alike. Before buying, careful checking of structural condition and watertightness remains the key to fully benefiting from its longevity.