Buying a shipping container sounds simple until you start looking at the options. You may need a container for storage, international shipping, a construction project, a workshop, a temporary office or even a building conversion. Suddenly, questions about size, condition, doors, height and specifications start to matter.
The right container is not necessarily the newest or the cheapest one. It is the one that fits the job, the site and your budget without creating problems later.
This guide explains the main things to consider before buying a shipping container, so you can make a more informed decision.
``` Choosing the right shipping container starts with understanding how you intend to use it.Start With How You Will Use the Container
Before comparing prices, decide exactly what the container needs to do.
A container used to store household furniture does not necessarily need the same specifications as one used to transport cargo overseas. Likewise, a container that will become a workshop or building has different requirements from one that will sit on a construction site for temporary storage.
Common uses include:
- General storage
- International cargo transportation
- Construction-site storage
- Equipment and machinery storage
- Workshops
- Site offices
- Retail or commercial spaces
- Container homes and guest accommodation
- Modified and specialised structures
Write down what you intend to store or build before choosing the container. That simple step can prevent you from paying for features you do not need—or discovering that the container you bought is too small.
Choose the Right Container Size
Size is one of the first decisions you will need to make. Standard shipping containers are commonly available in 20-foot and 40-foot lengths, with high-cube versions providing additional internal height.
20-foot shipping containers
A standard 20-foot container is a popular choice when space is limited or the storage requirement is relatively modest.
It can work well for household belongings, tools, equipment, stock, building materials and many other general storage applications.
Its smaller footprint can also make it easier to position on properties where access or available ground space is limited.
40-foot shipping containers
A 40-foot container provides substantially more floor space than a 20-foot unit. It is often a better option when you need to store larger quantities of goods or create a bigger enclosed space.
Before choosing one, however, check whether your site can accommodate its length and whether delivery equipment will have enough room to manoeuvre.
40-foot high-cube containers
A high-cube container has greater internal height than a standard-height container. That extra vertical space can be useful when you need more headroom, additional storage options or are planning a conversion.
For some building and workshop projects, the additional height can make a noticeable difference to the finished space.
Do You Need a New or Used Container?
The condition of a shipping container is another important consideration.
People sometimes use terms such as “new,” “one-trip” and “used” differently depending on the supplier and market, so it is worth asking exactly what you are being offered rather than relying on the label alone.
New or one-trip containers
A one-trip container is generally a container that has been manufactured and used for a limited initial voyage before being sold into the secondary market.
These containers typically have less wear than older used units and can be attractive when appearance, condition or long-term use matters.
Used shipping containers
Used containers can be a practical choice when your main priority is secure storage and you do not need a container in near-new condition.
They can show signs of previous use, including dents, scratches, surface corrosion or repairs. Those things are not automatically a problem, but the condition should be assessed carefully.
If the container will be modified into a home, office or other finished structure, choosing a container with a suitable structural condition can be more important than simply choosing the lowest purchase price.
Inspect the Container's Condition
If you are buying a used container, inspect it carefully before committing to the purchase.
Check the exterior
Look for significant corrosion, damaged panels, holes, severe dents and signs of poor repairs.
Some cosmetic damage is normal on used shipping containers. What matters is whether the damage affects the container's structural integrity, weather resistance or intended use.
Check the roof
The roof deserves particular attention. Look for corrosion, punctures, damaged seams and areas where water could enter.
It is easy to focus on the four walls and doors while forgetting that the roof is one of the most important parts of keeping stored goods dry.
Check the floor
Container floors are typically designed for demanding cargo environments, but they still need inspection.
Look for damaged boards, contamination, excessive moisture and areas that have deteriorated. If you intend to use the container for a sensitive application, ask the supplier about its previous use and flooring condition.
Check the doors
Open and close the container doors. They should operate properly and form a good seal when closed.
Pay attention to damaged hinges, locking mechanisms, seals and frames. A container with difficult doors can quickly become frustrating if you need to access it regularly.
Think About Access and Door Configuration
The standard cargo doors at one end of a container work well for many applications, but they are not ideal for everything.
If you expect to load and unload goods frequently, door placement can make a major difference.
For example, double-door containers, sometimes called tunnel containers, have doors at both ends. This can make loading and unloading easier because you can access the container from either side.
There are also containers and modifications designed with additional doors, side openings or other access arrangements. The right choice depends on the way you intend to use the space.
Consider the Container's Internal Dimensions
Do not choose a container based only on its external length.
The usable internal dimensions are what determine whether your equipment, pallets, furniture or other items will actually fit.
Before purchasing, measure your largest items and compare them with the container's internal length, width and height.
Also consider the door opening. An item might technically fit inside the container but still be impossible to load through the available door.
Think About Weight, Not Just Volume
A container can have plenty of physical space left while already carrying a significant amount of weight.
This is particularly important when shipping cargo. International transport involves rules concerning maximum gross mass, road transport restrictions, container specifications and the safe distribution of cargo.
If you are using the container for international shipping, make sure your cargo plan complies with the applicable requirements. The International Maritime Organization's container safety information is a useful starting point for understanding international container safety requirements.
Will the Container Be Used for International Shipping?
This question changes the buying decision considerably.
A container intended only for storage on private property does not necessarily have the same requirements as one that will be loaded with cargo and transported internationally.
For international transport, the container needs to meet the relevant standards and have the appropriate certification for the intended use. One important system is the Convention for Safe Containers (CSC), which establishes safety requirements for containers used in international transport.
The IMO's information on the International Convention for Safe Containers provides further details.
If you are buying a container specifically for international cargo, tell your supplier before purchasing. Do not assume that every container available for sale is automatically suitable for international transport.
Check the Delivery Requirements Before Buying
A surprisingly common mistake is choosing a container before thinking about how it will get onto the property.
A 40-foot container may fit comfortably on your site but still be difficult to deliver if the access road is narrow or the delivery vehicle cannot position itself correctly.
Before ordering, consider:
- Road width
- Gate width
- Overhead power lines
- Trees and branches
- Low bridges or other height restrictions
- Turning space
- Ground conditions
- Available unloading space
- The equipment required to place the container
Ask your container supplier about delivery requirements before paying for the unit. It is much easier to solve an access problem before the container is dispatched.
Consider the Site Where the Container Will Sit
A shipping container is heavy, and the ground beneath it matters.
The site should provide appropriate support and drainage. Depending on the project and local conditions, containers may be placed on concrete foundations, blocks, steel supports or other suitable systems.
The exact foundation approach should be determined according to the container's use, local soil conditions, climate and applicable building requirements.
Do not assume that simply placing a container on uneven ground is a long-term solution. Poor support can contribute to problems with doors, frames and structural alignment.
What If You Want to Convert the Container?
If your plan is to turn the container into an office, workshop, shop, home or other building, choose the container with the conversion in mind.
Cutting large openings into the walls can affect the original structural system. Adding windows, doors, electrical installations, plumbing, insulation and interior finishes also changes the project considerably.
For larger modifications, work with an appropriately qualified professional and check the building regulations that apply to your location.
If you are interested in residential applications, you may also want to read our guide on the rise of container homes to understand some of the opportunities and challenges involved.
Don't Ignore the Container's Previous Use
A used container has a history.
If you are purchasing one for storage, ask about its previous use where possible. This can be particularly important if you intend to store food, sensitive materials or anything that could be affected by previous cargo or contamination.
A container that looks good from the outside is not necessarily appropriate for every application.
Compare the Total Cost
Price is important, but the purchase price should not be the only number you compare.
Your actual project cost may include:
- The container itself
- Delivery
- Unloading and positioning
- Site preparation
- Foundation or supports
- Repairs or repainting
- Locks and security equipment
- Modifications
- Insulation
- Electrical and plumbing work
- Interior and exterior finishes
A cheaper container may therefore become the more expensive option if it requires extensive repairs or is difficult to deliver.
Questions to Ask Your Container Supplier
Before placing an order, ask clear questions. A reputable supplier should be able to explain what you are buying and identify any limitations that could affect your project.
Useful questions include:
- What size is the container?
- Is it new, one-trip or used?
- What is its current condition?
- Does it have any significant corrosion or structural damage?
- Are the doors and locking bars working correctly?
- Is the container wind and watertight for the intended use?
- What are the internal and external dimensions?
- Is it suitable for international shipping?
- What delivery equipment will be required?
- What is included in the quoted price?
So, Which Shipping Container Should You Choose?
There is no single container that is right for every buyer.
If you need straightforward storage and have limited space, a 20-foot container may be enough. If you need more capacity, a 40-foot unit could make more sense. If internal height matters, a high-cube container deserves consideration.
If appearance and condition are important, a one-trip container may be worth the additional investment. If the container will mainly protect tools or equipment on a construction site, a suitable used container may offer better value.
And if the container is going to be converted into a home, office or commercial space, the condition, dimensions and modification possibilities deserve much more attention than the headline price.
Final Thoughts
The best way to choose a shipping container is to work backwards from the job you need it to do.
Start with the intended use. Then consider the required size, container condition, internal dimensions, door configuration, delivery access, site conditions and whether the container needs to meet international shipping requirements.
Most importantly, look at the complete cost rather than comparing container prices in isolation.
When those factors are considered before you buy, you are much more likely to end up with a container that works for your project instead of one that creates another problem to solve.
Frequently Asked Questions
What is the most common shipping container size?
20-foot and 40-foot containers are among the most commonly used standard sizes. The best choice depends on the amount and type of cargo or storage space required.
Is a 20-foot or 40-foot container better?
Neither is universally better. A 20-foot container is easier to accommodate on smaller sites, while a 40-foot container provides substantially more floor space. Your available space, delivery access and storage requirements should determine the choice.
Should I buy a new or used shipping container?
A new or one-trip container can be attractive when condition and appearance are important. A used container can provide good value for general storage when some cosmetic wear is acceptable. Inspect the container carefully and choose based on its intended use.
Can I use any shipping container for international shipping?
No. Containers used for international transport need to comply with the applicable safety and regulatory requirements. Ask the supplier specifically whether the container is suitable and certified for your intended transport use.
What should I check when buying a used shipping container?
Inspect the roof, walls, floor, doors, seals, locking mechanisms and frame. Look for significant corrosion, holes, structural damage, water ingress and poor repairs. Also ask about the container's previous use where relevant.
Can I modify a shipping container?
Yes. Containers can be modified with doors, windows, ventilation, insulation, electrical systems and other features. However, major structural modifications can affect the container's integrity and may require engineering and approval under local regulations.
Looking for a shipping container for your next project? Visit SteelForge Containers to explore available container options and find a unit suited to your storage, transport or conversion requirements.