Buried Shipping Containers: Can You Do It and What Are They Used For?

Shipping containers are a familiar sight on ships, trucks, and trains. But they have many more uses than transport – from home conversions to portable offices and even underground storage. 

The biggest reason for shipping containers being so popular is because space is at a premium, especially in urban areas. More and more people are choosing to bury shipping containers for secure, weatherproof storage that doesn’t take up space.

Can you bury a shipping container?

Shipping containers are almost perfectly designed for being buried underground. The same qualities that protect them on container ships are also useful in-ground. The rigid structure of shipping containers stays in place while they’re underground. And their tough corten steel walls resist dampness from the earth.

However, your shipping container will still need reinforcement. This helps it endure the weight of soil and water pressure, so that it can last even longer underground. You should also check local planning regulations to make sure that your buried container is safe and compliant.

Is it safe to bury a shipping container?

It is safe to bury a shipping container so long as it has been correctly adapted. Shipping containers are already pretty tough, with rust-resistant steel and strong locks. But they need extra reinforcement before burial.

When a container is buried, the ground puts pressure on it from all sides. You’ll need to consult a professional to install supports in the container so that it doesn’t cave in.

Buried shipping container uses

Buried shipping containers are cost-effective, secure, and extremely versatile. A growing number of people use buried shipping containers for storage or even temporary habitation. 

Storage

Shipping containers are very secure – and buried shipping containers offer even more protection. You can use them to store excess possessions, valuables, large furniture, memorabilia, craft materials, or even electronic appliances. For those who like to plan ahead, a cargo container can hold approximately fifty years’ worth of food supplies. 

Storm shelters

Buried shipping containers are especially popular in areas with extreme weather events. When properly installed, they can offer protection from heat waves and storm damage. You could use an underground shipping container as temporary shelter or storage for precious items when your home is at risk.

Underground bunkers

Shipping containers can be converted into underground bunkers. In some places, they are used as a secure shelter during civil unrest or even war. You can outfit your shipping container bunker with extra features, such as electricity, plumbing, or even shielding from radiation or an EMP. 

Additional space

Many people use shipping containers as workshops, hobby spaces, or home offices – above ground or underground! Burying your container is ideal if you want to keep the surface-level space for gardening or other outdoor activities. It’s a discreet, cost-effective way to add more space to your property.

Advantages and disadvantages of burying a shipping container

Buried shipping containers are popular because they’re durable, cost-effective, and save on space. But they do come with some cons as well like excavating the site, reinforcing the container, and protecting it against potential water damage.

Pros

The biggest advantage of shipping containers is that they’re cost-effective. A used container costs a fraction of the price of a traditional concrete structure. It can be installed quickly, even with modifications.

Buried shipping containers are space-saving, too. They provide extra storage or living space while leaving the surface available at ground level. And because they’re hidden underground, they’re even more private and secure than regular storage solutions. 

Finally, underground shipping containers are low-maintenance. The earth around them acts as natural insulation, so you’ll have lower cooling and heating costs than in a conventional building. You can also seal and waterproof the container so that it needs minimal repairs over time.

Cons

Although underground shipping containers are relatively quick and cheap to install, they still take plenty of work. The site has to be prepared first, which may require heavy digging machinery. Then, you’ll need to modify the container itself, with sealing, waterproofing, ventilation, insulation, and frame reinforcements. 

You should also consider how you’ll access the container once it is buried. Bear in mind that it will be much harder to make changes once the container is buried. 

Last of all, you’ll need to research the local planning regulations at your site. You might need planning permission for your shipping container and there will likely be rules about how to make your buried container safe. If you don’t comply with regulations, then you risk a fine or even having to remove the container altogether.. 

How much does it cost to bury a container?

The cost of burying a shipping container in the UK depends on several factors. Details like the container size and soil conditions at the site can make a big difference.

On average, a standard 20-foot used shipping container can cost between £1,500 and £3,000. A brand new container could set you back as much as £5,000. You’ll also need to factor in excavation costs for burying the container, which range from £1,500-3,000 depending on depth and soil conditions.

The amount of reinforcing, waterproofing, and drainage systems needed will also vary depending on your specific requirements. Overall, the total cost of burying a shipping container can be anywhere from £4,000 to £10,000 or more.

However, it’s still a bargain compared to conventional storm shelters, bunkers, or extensions. Those structures can easily cost £15,00-30,000 for a custom build.

How to bury a shipping container

Installing an underground shipping container is a complex process. It’s important to follow all these steps so that your container is safe, comfortable, and long-lasting. 

Select the location

To bury a shipping container, you need an accessible site with enough space and the right soil conditions.

First, you’ll need to check the soil type and the level of the water table. A site with a high water table and soft soil will be challenging, compared to a site with good drainage and well-compacted soil. Remember that the ground can put significant pressure on the container.

Next, make sure that there’s enough space on site. It’s not just about the shipping container itself: you also need room for access, ventilation, drainage, and proper structural integrity. Finally, check that the container delivery truck and any heavy machinery can reach the site.

Legal considerations

Research your local planning regulations before taking any action on the project. You’ll need to look for regulations about buried structures specifically, not just shipping containers in general. Some regions require special permissions or may even ban underground containers.

Choose the shipping container

Shipping containers come in a wide range of shapes and sizes. The standard lengths are 10, 20, or 40 feet, but you can go longer. You can also find variations in the standard sizes, such as extra-tall high cube containers. 

The most important thing is that your container should be structurally sound. New containers will be in the best condition, but they are a lot more expensive. Used containers are more affordable and are fine to use so long as they are thoroughly inspected and maintained. 

Reinforce the container

Shipping containers use what’s called a “monocoque” structure. Most of the load is on the corners, while the walls of the container are its weakest point. If you plan to bury a container, the walls will need reinforcement.

You can use steel supports or braces to strengthen both the walls and corners for extra peace of mind. Steel beams or a reinforced cover will protect the ceiling from collapse. All the joints and seams must be sealed to prevent water getting into the structure and weakening the supports.

You can also weld or bolt additional reinforcements along the frame. The level of reinforcement that you need will depend on the container’s condition and the weight of the soil where it’s buried. 

Seal and waterproof the container

Sealing and waterproofing stops moisture from getting into the container. It protects the steel structure from rust, and keeps damp away from the container’s contents.

Start the process by cleaning the outside of the container thoroughly. Make sure that all rust and debris has been removed. Next, apply a high-quality rust-resistant primer and a waterproof sealant. Pay extra attention to the seams, doors, and any openings, sealing them with a strong, durable rubber or silicone sealant to prevent leaks.

You could also finish the bottom and lower sides with a waterproof membrane or bitumen paint. This gives the buried container extra protection from water damage if the soil around it becomes waterlogged.

Prepare the site

Even if you’ve found the perfect site for your buried shipping container, it will still need some preparation. Start by clearing away any debris, vegetation, or rocks that could interfere with the installation. 

Next, mark out the container’s dimensions to make sure that it fits in the space available. You’ll need to plan for drainage around the site as well, so that water doesn’t pool around the container. Don’t forget to check for any underground obstacles, utility pipes, or cables that could disrupt the installation later on.

Excavate the hole

Once the site is ready, it’s time to excavate. You need a pit that is large enough to hold the shipping container and any reinforcing supports. It should have an extra four feet of space along each side. For example, a 20-foot container would need a pit that’s 28 feet long by 16 feet wide. 

The depth of the pit depends on how deep you plan to bury the container. For most standard sizes, a 7-foot pit is deep enough to bury the container with some of the structure showing on the surface. If you want the container to be completely hidden, you’ll need to dig to at least 10 feet deep.

Place the container

Line the base of the pit with gravel or crushed stone for drainage, then place the container on top. You’ll need to level the container with blocks, slabs, or shims so that there’s no risk of it moving around. 

Plan for access and ventilation

The access and ventilation requirements for your container will depend on what you plan to use it for. But whatever your plans, make sure that there is space for safe access to the container. If you plan to spend any time inside (for example, using the container as an office or workshop), make sure that the ventilation system is properly installed alongside the container.

Backfill and secure the hole

Backfilling might sound like the easy part – but you’ll still need to go slowly and carefully. As you backfill the pit, compact the soil so that it presses in firmly around the container and holds everything in place. Take regular pauses to check that the container is still level.

Create access to the container

Most buried containers have an entry point through the top or side of the container. It depends how much of your container is accessible from the surface once it’s buried. 

For top-side access, you can install a hatch or trapdoor. You might also need steps or a ladder if the container is buried very deep. If you want side access, then you may need to create an entry shaft or tunnel that leads to the container door.

Whichever option you choose, the entry point must be reinforced and sealed, just like the rest of the structure. 

Landscape to blend in with the surroundings

Some people like to make a statement with their buried shipping container. But in most cases, you want it to blend in with the surroundings. This is especially important if you use your buried container for secure storage. You can conceal the container by landscaping around it with turf, plants, or hedges.

Start using your new space

Congratulations – your buried shipping container is ready to use! Once you’ve followed all the steps above, you’re free to use the extra space to the full. 

Maintaining your buried container

Buried shipping containers need just as much maintenance as containers above ground. Here are the key areas to check regularly:

• The container structure for any signs of damp, rust, moisture build-up, or wear
• The drainage system, to see that it’s running smoothly
• Access points, to make sure that they are secure, dry, and in full working order
• The surrounding soil for any signs of settling or shifting

Keeping up with these routine checks will help your buried container last for decades.

The bottom line

Buried shipping containers are a practical, cost-effective solution for secure storage, storm shelters, and even underground bunkers. They are durable and can be adapted for various uses, from keeping valuables safe to providing extra living space. 

However, burying a shipping container requires careful planning, including reinforcing the structure, waterproofing, and adhering to local regulations. While installation can be complex and costly, the benefits, such as privacy, security, and low maintenance, make it a worthwhile investment for many. 

Once properly set up, buried shipping containers offer a unique way to maximize space without sacrificing convenience.

FAQs

How long will a shipping container last buried underground?

Shipping containers are built to last. When your container is buried underground, with proper waterproofing, sealant, reinforcements, and regular maintenance, it could last at least 20-30 years. However, local conditions will make a difference. The soil type, moisture levels, and quality of modifications will all affect the lifespan your container.

How deep can you bury a shipping container?

If you want to fully bury a container out of sight, you’ll need to dig around 10 feet deep. That’s close to the maximum depth for burying a shipping container, which is about 10-12 feet deep. 

Once again, the local soil type and moisture levels will affect how deep you can go. Containers which are fully buried will also need extra reinforcement to prevent them collapsing. Below 12 feet, it’s unlikely that you could reinforce the structure enough for it to hold up.

Can I bury a shipping container in my backyard?

You may be able to bury a shipping container in your backyard. However, you’ll need to check local planning regulations and building codes to make sure that it follows the rules. You’ll also need to consider the soil conditions, moisture level, and access for drainage and ventilation at the site. It’s best to ask a professional for specific guidance on your property.