Discover what a topper container is and how it can help you maximise space in self-storage sites, construction projects, and modular builds.  Available in 20ft and 40ft, our custom-built toppers are converted in-house, for secure, stackable, and space-saving solutions.

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What is a Topper?

A topper is a purpose-built container unit designed to be placed on top of a standard shipping container. It’s an innovative and space-efficient solution used in a variety of sectors, particularly in self-storage, construction, events, and modular accommodation. Toppers allow businesses and site operators to maximise the use of vertical space without increasing their physical footprint, making them ideal for space-restricted or high-demand environments.

Toppers sit securely on top of a full-sized container while maintaining stability and ease of access. They are often used in double-stacked storage setups, enabling businesses to expand upward, which in turn maximises available space without the need for additional land.

Why Choose a Topper?

Many of our clients, particularly those running self-storage facilities, are now choosing toppers as a smart way to increase capacity without expanding their site. With land and planning permissions becoming more difficult to navigate, building upwards using container toppers is proving to be a cost-effective and scalable solution.

To meet this growing demand, our in-house container conversions team is always working hard in our on-site warehouse, building and modifying topper containers to suit a range of needs. Each unit is prepared to the highest standards, and we’re proud to offer flexible solutions tailored to your site.

Available Sizes

Our topper containers are available in 20ft and 40ft options, making them a versatile and practical choice for any operation looking to optimise space. Whether you’re stacking them for storage purposes or modifying them for offices or events, we have the right size for your project.

Common Uses for Toppers:

• Self-Storage: Double your unit capacity by stacking toppers on existing containers.
• Construction: Add site offices, storage rooms, or welfare units without taking up extra ground space.
• Modular Builds: Expand your accommodation, classrooms, or office blocks vertically.

Benefits of Toppers

• Maximise Site Capacity without extending your footprint
• Quick to Deploy and easy to relocate or reconfigure
• Customisable with doors, windows, electrics, and branding
• Secure and Durable, built to withstand all weather conditions
• Cost-Effective, especially compared to traditional building methods

Need More Information?

Our expert conversions team is ready to help you plan and deliver the right topper solution for your site. Whether you're exploring ways to scale up a self-storage facility or need advice on layout and stacking, we’re here to assist.

📧 Contact us today at: conversions@willbox.co.uk