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

Why choose a used 20ft shipping container?

The used 20ft Dry shipping container is a strategic choice for many businesses and individuals. With standard dimensions (6.06 m long, 2.44 m wide and 2.59 m high), it offers an internal volume of around 33 m³ and a floor area of 14 m², enough to store the contents of a small apartment or several pallets of goods. Its Corten steel structure and 28 mm marine plywood floor give it exceptional strength, while its ISO certification guarantees universal compatibility with transport infrastructure.

Choosing a reconditioned, watertight used container (Wind & Watertight) offers unbeatable value for money. Unlike a new container, whose cost can be prohibitive for static use, a reconditioned used model offers the same guarantees of watertightness and strength for a much lower budget. It is therefore an economical and durable solution, whether for professional or personal use.

Professional uses of the 20ft container

Secure on-site storage

In the construction and public works sector, the 20ft container is commonly used as a site welfare unit. It can be fitted out as a changing room, canteen or site office. Its strength allows it to withstand site conditions, and its ISO design allows it to be moved by crane truck from one phase to another. Companies also use it to store tools, materials or sensitive equipment, protected from theft and bad weather.

Buffer storage unit for logistics

Logistics companies use the 20ft container as a buffer storage unit on their platform. It allows temporary storage of goods that are not sensitive to moderate humidity, while protecting them from bad weather and intrusions. Its modularity allows it to be stacked or placed side by side to create additional storage space without heavy construction.

Technical unit for local authorities

Local authorities see it as a technical unit for municipal services, a shelter for archives or a temporary collection point. Its ease of installation and durability make it a quick and economical solution for temporary or permanent needs.

Residential and personal uses

Garage, workshop or garden room

For individuals, the 20ft container can serve as an extra garage, a DIY workshop or storage space for garden furniture and seasonal equipment. Its lockable door (with a suitable padlock, not supplied) effectively deters intruders, and its Corten steel structure withstands bad weather without heavy maintenance.

Additional storage space

Whether you need to store archives, spare parts, furniture or seasonal goods, the 20ft container offers a secure and durable storage solution. Its 33 m³ volume allows you to store a large quantity of items while freeing up space in your home or garage.

Modifications and fit-outs: what you need to know

Insulation and interior lining

The steel structure is thermally conductive, meaning an uninsulated container can become very hot in summer and very cold in winter. For regular use, it is recommended to add insulation (for example with mineral wool or rigid panels) and an interior lining. This step is essential to ensure thermal comfort and prevent condensation.

Ventilation and humidity management

Condensation can form inside if the air is not renewed. Installing ventilation grilles or an air conditioning system may be necessary, especially if the container is intended for habitable use or for storing humidity-sensitive goods. For simple storage use, passive vents may be sufficient.

Openings and structural modifications

Any structural modification (drilling walls, adding windows, etc.) must be carried out in accordance with good practice and may affect the watertightness warranty. It is advisable to call on professionals for this type of work. Adding an extra door, a window or a partition allows you to create custom spaces, but requires prior consideration of the structure and insulation.

Key checks when buying a used container

Structural inspection

When buying, carefully examine the condition of the structure: look for perforating rust, major deformations or cracked welds. Surface rust is normal and can be treated, but deep corrosion can compromise strength. Also check the floor: it should not have soft spots, rot or delamination. Marine plywood can be sanded and treated, but if it is too damaged, replacement is costly.

Checking doors and watertightness

The doors should open and close without forcing, the locks should work properly and the seals should be supple and free of tears. A light test (closing the doors and looking for gaps) can give a first indication. Also make sure the container has a valid CSC plate, mandatory for international transport.

Regulations and installation

Planning rules: what the law says

In France, installing a container on private land may be subject to formalities depending on its duration and use. If the container is placed for less than three months, no authorisation is generally required. Beyond that, a prior declaration of works may be required, especially if it is visible from the public highway or if it changes the appearance of the land. For residential use, even temporary, the rules are stricter: check with the local planning department, as the container may be treated as a construction and require a building permit. Always check the Local Urban Plan (PLU) before any installation.

Ground preparation

The container must be placed on a flat, stabilised surface, such as concrete slabs, blocks or a bed of compacted gravel. Soft ground can cause differential settlement and deform the structure. It is recommended to provide a slight excavation or shims to raise the container a few centimetres, to facilitate air circulation under the floor and avoid water stagnation. If the container is to remain in place, an anchoring system may be considered in windy regions.

Transport and delivery

Transporting a 20ft container in France requires a suitable container truck, generally an articulated vehicle with a specific chassis. The total laden weight (container + goods) must not exceed the legal limit of 44 tonnes for a 5-axle road train. The empty weight of a standard 20ft Dry is around 2.2 to 2.4 tonnes, leaving a large margin for cargo. Delivery to the destination can be carried out by crane truck or by a truck with a unloading arm, allowing the container to be placed on the ground without an additional crane. Provide a stable, level surface to avoid any subsidence.

Maintenance and durability

Maintaining a shipping container is relatively simple. Regular cleaning with clean water and mild soap removes salt deposits and dirt. Avoid overly powerful pressure washers that could damage the seals. Periodically inspect the door seals and apply a silicone-based care product to keep them supple. If paint chips appear, treat them with anti-rust paint to prevent corrosion. The floor can be swept and, if necessary, treated with linseed oil or a fungicide to protect it from moisture. Finally, regularly check the fastenings and locks to ensure they remain functional.

Comparison with other container formats

The standard 20ft is the most common and versatile format. The 40ft offers a volume of around 67 m³, double that, but requires a longer site and a suitable truck, often more expensive to move. The 40ft High Cube gains around 30 cm of internal height, useful for storing bulky but light goods, or for a fit-out with a false ceiling. The 10ft, rarer, is suitable for very restricted spaces but its price per cubic metre is generally higher. The 20ft High Cube adds height without increasing the footprint. Finally, specialised containers such as the Reefer (refrigerated), Open Top (open roof) or Flat Rack (without side walls) meet specific needs. The 20ft Dry remains the most versatile and economical for most common uses.

Specific fit-outs: from office to housing

Site office or welfare unit

Converting a 20ft container into a site office or welfare unit is one of the most common applications. The 14 m² interior allows several workstations, a meeting table and a changing area to be installed. For comfortable use, thermal and acoustic insulation, suitable lighting (natural via windows or skylights, and artificial via LEDs), and a power supply are required. Light partitions can separate an office area from a sanitary or kitchen area. This type of fit-out is often carried out in a workshop before delivery to site, reducing nuisance and delays.

Sanitary facilities and changing rooms

20ft containers are frequently fitted out as sanitary blocks for construction sites, campsites or events. Showers, toilets and washbasins are installed, with wastewater drainage to be provided. The floor's watertightness must be reinforced (resin or tiles) and mechanical ventilation is essential to remove humidity. This type of fit-out requires a water supply and an electrical connection, as well as drainage compliant with sanitary standards.

Sales space or mobile showroom

Some companies convert a 20ft container into a pop-up shop, showroom or exhibition stand. The side walls can be cut to create large glazed openings, and an awning can be added. The interior design is then focused on showcasing products: track lighting, display stands, counter. This type of container can be moved from trade fair to market, offering original visibility.

Light dwelling and tiny house

The 20ft container can serve as the basis for a light dwelling or a tiny house. With a surface area of 14 m², it is suitable for a compact studio. The fit-out must be optimised: sleeping area, kitchenette, shower room and living space. Insulation is essential, as are ventilation and energy supply (solar, generator or grid connection). Local regulations must be checked, as a habitable container is subject to the same rules as a traditional construction (building permit, compliance with habitability standards).

Optimising interior space: fit-out tips

With 33 m³ of internal volume, the 20ft container offers many optimisation possibilities. For storage, installing metal shelving over the full height makes the most of the volume. Pallets can be stacked on two or three levels depending on the load. For artisanal or industrial use, workbenches and machine tools can be fixed to the floor and walls. The internal width of 2.35 m allows easy movement, and the height of 2.39 m allows the installation of light mezzanines. Consider using low-consumption LED lighting and multi-socket outlets for powering equipment. Finally, wall storage solutions (hooks, shelves) make use of the corrugated walls without drilling the load-bearing structure.

20ft container and sustainable development

Buying a used container is part of a circular economy approach. Rather than manufacturing a new container, an existing unit is reused, saving the steel and energy required for its production. In addition, converting a container into living or working space avoids the construction of new buildings, which are often more resource-intensive. Corten steel is fully recyclable at end of life, and the marine plywood floor can be recovered for energy. By choosing a used container, you therefore help reduce the environmental footprint of your project while making substantial savings.

Conclusion

The used 20ft Dry shipping container is a proven product, whose ISO design guarantees compatibility with existing infrastructure. Its Corten steel and marine plywood floor give it appreciable longevity, provided it is minimally maintained and regularly inspected. Whether you are a professional looking for a durable storage solution or an individual wishing to fit out additional space, this format is a balanced compromise between capacity, footprint and cost. Transport Hosni Conteneur, based in Marseille, specialises in the sale and rental of shipping containers. We can advise you on choosing the model suited to your project and support you in its implementation.