Complete Buying Guide: How to Choose a Used 20-Foot Shipping Container (Dry)

Why choose a used 20-foot shipping container?

The used 20-foot Dry shipping container is a versatile storage and transport solution, valued for its cost-effectiveness. Compared to a new container, buying used saves significantly while still benefiting from a Corten steel structure built to withstand marine and industrial environments. Whether you are a construction professional, farmer, retailer, or individual, this container meets many needs: secure storage, technical room, workshop, or cargo shipping.

However, buying a used container is not something to improvise. Structural condition, watertightness, regulatory compliance, and delivery logistics are decisive factors. This guide walks you through each step to make the right choice and avoid pitfalls.

Technical specifications of a 20-foot Dry container

Before any purchase, it is essential to know the standard specifications of a 20-foot Dry container. This information lets you verify the consistency of the offer and plan its use.

Dimensions and volume

A 20-foot Dry container complies with ISO 668 and ISO 1496-1 standards. Its external dimensions are approximately 6.06 m long, 2.44 m wide, and 2.59 m high. Inside, the usable volume is about 33 m³, with internal dimensions of roughly 5.90 m x 2.35 m x 2.39 m. The floor area is about 13.8 m². These dimensions may vary slightly depending on the manufacturer and the container's condition.

Materials and construction

The structure is made of Corten steel, a low-alloy steel that resists corrosion better thanks to a protective oxide layer. The walls and roof are corrugated sheet metal, providing rigidity and lightness. The floor is 28 mm marine plywood, capable of supporting heavy rolling and static loads while resisting moisture. The rear doors are double doors fitted with container locks and rubber seals.

Weight and payload

The maximum gross mass (MGW) is generally 30,480 kg. The tare weight (empty weight) is between 2,200 and 2,400 kg, allowing a payload of about 28 tonnes. These values are indicative and must be verified on the CSC plate attached to the door.

Criteria for choosing a used 20-foot container

Not all used containers are equal. To make an informed purchase, carefully examine the following points.

Structural condition

Inspect the walls, roof, and floor for holes, cracks, or major deformation. Surface rust is normal, but perforating rust indicates structural weakness. Check the welds at the corners and floor rails, where moisture accumulates. The four corner castings must be free of cracks and deformation.

Watertightness and doors

The doors must open and close without forcing. Rubber seals must be flexible and not cracked. The "Wind & Watertight" (WWT) label guarantees watertightness at the time of sale, but not long-term without maintenance. Test watertightness by closing the doors and checking that no light passes through.

Floor

The marine plywood floor must not show soft spots, delamination, or rot. Walk across the entire surface to detect any weaknesses. A sound floor is essential for supporting heavy loads.

CSC plate and compliance

The CSC (Convention for Safe Containers) plate must be legible and up to date. It certifies that the container meets international safety requirements. Check the date of the last inspection. For international transport use, a valid plate is mandatory.

Container history

Find out about prior use: has the container carried dangerous or polluting goods? A "food grade" container is sometimes offered, but this is a commercial claim, not an official certification. Thorough cleaning may be necessary.

Used condition grades: what does "refurbished" mean?

In the industry, used containers are often classified into categories: "as is", "refurbished", or "Wind & Watertight". A refurbished container has been inspected and restored: cleaning, repair of minor damage, replacement of seals if necessary. The WWT guarantee indicates it is wind and watertight at the time of sale. An "as is" container is sold without a watertightness guarantee and may have defects. The price varies considerably depending on condition. For outdoor storage use, choose a refurbished container with a WWT guarantee.

Uses and applications of a 20-foot Dry container

The 20-foot Dry container is versatile. Here are its main uses.

Static storage

Ideal for securing equipment, archives, tools, construction gear, goods, or personal belongings. Its closed, lockable design (with a suitable padlock, not included) protects against intrusion, weather, and pests, provided it is regularly maintained.

Construction and industry

On a construction site, it can serve as a technical room, basic office, or tool store. In industry, it stores spare parts, consumables, or non-hazardous chemicals, in compliance with storage rules.

Agriculture

It houses seeds, fertilizers, or small equipment, and can be fitted with shelving to optimize space.

Retail and events

It serves as temporary storage, a receiving point, or a promotional display. In events, it can be used as a technical room, control booth, or equipment storage.

Export

For shipping goods by sea, rail, or road, the container must be in good condition and meet carrier requirements. The verified gross mass (VGM) must be declared before loading.

Conversion and fit-out

After specific work (insulation, electricity, plumbing, ventilation), it can become a storage room, workshop, break room, or even modular housing. These conversions require technical skills and compliance with local planning rules.

Key checks when buying

To avoid unpleasant surprises, systematically check the following items.

• Structure: no holes, cracks, or major deformation on walls, roof, and floor.
• Doors: open and close without forcing, seals flexible and not cracked.
• Floor: no soft spots or delamination.
• Rust: surface rust tolerated, perforating rust to be avoided.
• CSC plate: legible and up to date.
• History: no transport of dangerous or polluting goods.
• Corner castings: free of cracks and deformation.

Regulations and transport

Buying a container comes with regulatory and logistical constraints.

International regulations

The CSC Convention, which came into force in 1977 and is managed by the IMO, requires that any container used in international transport have a valid CSC approval plate and undergo periodic inspections. In France, the decree of 18 December 2001 on container safety sets out inspection procedures. ISO 668 and ISO 1496-1 define dimensions, masses, and design specifications.

Road transport

Decree No. 2003-468 of 21 May 2003 sets maximum vehicle weights and dimensions: a road train must not exceed 40 tonnes GVW, 16.50 m in length, and 2.55 m in width. A 20-foot container complies with these limits, but the carrier must have a container chassis and follow lashing rules.

Sea transport

IMO rules on verified gross mass (VGM) apply: the weight of the container and its cargo must be declared before loading.

Fixed installation and planning

For a fixed installation, the container is often treated as a structure or light installation. Depending on the municipality, a prior works declaration or building permit may be required, especially if the container is visible from the public road or intended for habitation. Consult the local planning department before any installation. If the container is used as a workplace, occupational health and safety rules apply (ventilation, lighting, fire safety).

Maintenance and extending service life

A well-maintained used container can last for many years. Here are the essential steps.

Regular maintenance

• Clean the roof and walls to prevent debris buildup and corrosion.
• Check door seals and replace if necessary.
• Grease hinges and locks.
• Inspect the floor for rotted or weakened areas.
• Touch up anti-rust paint on deep scratches.

Annual tasks

• Inspect the roof after each episode of strong wind or hail.
• Check welds at corners and floor rails.
• Inspect the four corner castings.
• Open the doors in dry weather to renew air and limit condensation.
• Add a passive dehumidifier or absorbent packs for storing moisture-sensitive equipment.

Installation precautions

Place the container on stable, level ground, such as wooden beams or concrete blocks, to prevent deformation and ensure good ventilation under the floor. Allow space around it for door opening and access.

Comparing the 20-foot to other solutions

The choice of container depends on your needs for volume, mobility, and budget.

20-foot vs 40-foot

The standard 40-foot offers an internal volume of about 67 m³, double that of the 20-foot, with an external length of about 12.19 m. It is better suited to transporting large volumes but is heavier and requires a longer truck. The 40-foot High Cube adds about 30 cm of internal height, useful for tall volumes or more comfortable fit-out.

20-foot vs other types

The Open Top container has a removable roof for loading tall objects or crane loading. The Flat Rack, with no walls or roof, is designed for out-of-gauge loads. The Reefer is insulated and fitted with a refrigeration unit for perishable goods. The 20-foot Dry remains the most versatile and cost-effective for static storage.

Used vs new 20-foot

Used reduces cost but requires careful condition checks. New offers a manufacturer's warranty and optimal watertightness, but at a higher price.

20-foot vs garden shed or masonry building

The container is faster to install, movable, and robust. It requires maintenance and possibly a permit. A garden shed or masonry building may be more attractive but less secure and longer to build.

Budget and price of a used 20-foot container

The price of a used 20-foot Dry container varies with condition, age, location, and availability. As a guide, the reference price is €1,350.00 (excluding transport and options). This price may fluctuate. Add the cost of transport, which depends on distance and handling equipment (crane truck, forklift). For static use, also budget for any fit-out (insulation, electricity, ventilation) and planning permits.

Accessories and additional equipment

A 20-foot Dry container can be fitted with various accessories to improve comfort and security. Here are the main ones.

Security

To enhance protection against theft, there are padlocks specially designed for containers, security bars, or additional locking systems. A quality, corrosion-resistant padlock is essential if the container is isolated. It is also possible to install an alarm or video surveillance system, but this requires a power supply.

Ventilation and insulation

To limit condensation, especially if the container is used to store sensitive equipment, ventilation grilles can be added. They must be installed properly so as not to compromise watertightness. Thermal insulation (rigid panels, spray foam) is recommended if the container is intended for regular use as a workplace or workshop. It improves comfort and reduces temperature variations.

Interior fit-out

Metal shelving, racks, or custom storage systems help optimize space. For workshop use, electrical installation (lighting, sockets) must be carried out by a professional and comply with current standards. An additional pedestrian door can be added, but it must be cut and reinforced by a professional to preserve the structure.

Roof protection

A tarp or additional coating can protect the roof from weather and extend its life. However, a poorly secured tarp can trap moisture and promote corrosion. It is better to use suitable solutions, such as anti-corrosion paints or breathable membranes.

Common mistakes to avoid when buying

To make a successful purchase, avoid these frequent pitfalls.

• Neglecting inspection: do not rely solely on photos or the description. Visit the container or request a detailed inspection report.
• Underestimating transport costs: transport can represent a significant part of the budget, especially if the container must be delivered to a hard-to-reach area.
• Forgetting permits: check before buying, especially if you plan a fixed installation.
• Buying a container without a valid CSC plate: this can cause problems for export or resale.
• Ignoring history: a container that has carried chemicals may give off odors or contain dangerous residues.
• Neglecting future maintenance: a used container requires regular maintenance. Allow time and budget for it.

How does buying from Transport Hosni Conteneur work?

Transport Hosni Conteneur, based in Marseille, offers refurbished used shipping containers guaranteed Wind & Watertight. The buying process is simple: you contact the company to check availability and the exact condition of the container, you confirm the price and delivery options, then you schedule delivery. The reference price is €1,350.00 excluding transport. It is recommended to request recent photos and, if possible, to visit the container before purchase. For any technical questions, the team can advise you on the model best suited to your use.

Conclusion

Choosing a used 20-foot Dry shipping container requires method. By checking the structural condition, watertightness, CSC plate, and history, you maximize your chances of success. Then adapt your choice to your use: storage, construction, export, or fit-out. Remember to plan for delivery logistics and any permits. For any technical questions or to check availability, contact Transport Hosni Conteneur in Marseille directly. A well-prepared purchase is a lasting investment.