How to Choose the Right Expandable Container House: A Practical Guide

If you’re considering buying an expandable container house, you’re not alone. These modern, foldable structures are becoming incredibly popular for both residential and commercial use—especially the 20ft and 40ft models.

What Are the Most Popular Sizes?

The best-selling expandable container house sizes on the market are:
• 20ft expandable house:
Dimensions: 5900mm × 6300mm × 2480mm
Includes: Living room, bedroom, and bathroom
Shipping efficiency: 2 units fit in a 40HQ container
• 40ft expandable house:
Dimensions: 5900mm × 6300mm × 2480mm
Includes: Larger space with customizable layout
Shipping efficiency: 1 unit fits in a 40HQ container

Both models are built with a galvanized steel frame and EPS sandwich panels—a structure that offers durability, thermal insulation, and long-lasting protection.

How to Choose a High-Quality Expandable Container House?

Not all expandable houses are built the same. Here’s what really matters when choosing one:

1. Waterproof Design

This is critical. Some cheap models on the market leak or allow wind to come through poorly sealed joints.
At Old Bull Container House, we use a triple-layer waterproof structure combined with our patented size-control system to ensure zero water leakage and excellent wind protection.

2. Galvanized Steel Coating Process

Many manufacturers use spray paint, which looks good at first—but wears out quickly.
We use a 360-degree baked-on paint process, which makes the surface smoother, shinier, and much more corrosion-resistant.

3. Don’t Judge by the Doors and Windows

Honestly, windows, doors, lights, and bathroom fittings are usually customizable. These parts are not reliable indicators of product quality. Focus on the structure and waterproofing instead.

A Word of Advice When Choosing a Supplier

At Old Bull Container House, we specialize only in expandable container houses—and we believe that’s a major advantage.

When you’re researching a supplier, ask them:
“What’s your main product?”

If they say:
“All our products are great!”
…you may want to think twice.

In this industry, no factory can do everything well. Choose a specialist, not a generalist. That’s how you get better quality, better service, and more reliability.

Want to Learn More?

Whether you’re building a guest house, site office, or your dream vacation home, expandable container houses offer an affordable, fast, and stylish solution.

Feel free to contact us for a quote or advice—we’re happy to help!