Shipping containers are a versatile and durable solution for storage, transport, and even building projects. However, not all containers are the same, and choosing the right one requires careful consideration. Whether you’re buying a container for storage, shipping, or conversion into a home or office, here’s what you need to know before making a purchase.
1. Container Condition: New vs. Used
New (One-Trip) Containers
These containers have only been used once for shipping and are in near-perfect condition.
Minimal wear and tear, no rust, dents, or structural issues.
Higher price but longest lifespan (25+ years with proper maintenance).
Best choice for high-end storage, offices, or housing conversions.
Used Containers
More affordable but may have visible wear, rust, and dents.
Ideal for basic storage or projects where aesthetics don’t matter.
Varies in condition: some may be cargo-ready (refurbished and repainted) while others are watertight (sold as-is).
Lifespan depends on prior use, maintenance, and structural integrity.
Tip: If buying used, inspect the container in person or request detailed photos to check for rust, leaks, and floor damage.
2. Container Grades and Certifications
Different classifications indicate a container’s quality and usability:
Cargo-Ready (Cargo-Worthy):
Structurally sound and certified for active shipping.
Refurbished, repainted, and treated for rust.
Best for long-term storage, transportation, or heavy-duty use.
Watertight (Wind & Watertight - WWT):
Retired from shipping but still keeps out wind and water.
Sold as-is, often with rust or dents.
Best for low-budget storage solutions where structural integrity isn’t a top concern.
One-Trip:
Essentially brand new, used for only one journey.
Best for homes, offices, and long-term investment projects.
3. Size: What Dimensions Do You Need?
Shipping containers come in standard sizes, so choosing the right one depends on your space and storage needs.
Most Common Sizes:
20ft (Standard) – Ideal for small storage, residential use, and basic cargo.
40ft (Standard or High Cube) – Best for large storage, shipping, and conversion projects.
40ft High Cube – Offers extra vertical space (9’6” height instead of 8’6”), great for taller items or livable spaces.
Other Sizes:
10ft containers – Compact, good for limited-space storage.
45ft & 53ft containers – Extra-large sizes, typically used in specialized industries.
Tip: Consider high cube containers if you need more headroom for stacking or modifications.
4. Material Quality: Corten Steel vs. Standard Steel
Most high-quality shipping containers are made from Corten steel, which:
✔ Is weather-resistant and develops a protective rust layer that slows further corrosion.
✔ Lasts longer than standard steel in humid or coastal areas.
✔ Requires less maintenance over time.
Avoid containers with excessive rust, as it weakens structural integrity.
5. Floor Condition: Wood vs. Steel
Container floors are usually made of marine-grade plywood with a steel frame. Things to check:
✔ Check for damage or rot—especially in used containers.
✔ Avoid containers with chemical contamination (if previously used for hazardous goods).
✔ If repurposing for livable space, consider replacing the floor or adding a protective layer.
6. Doors and Seals: Ensuring Weatherproofing
Check door seals for cracks or gaps—damaged seals can let in water or pests.
Ensure hinges and locking bars move smoothly—if stiff, they may need lubrication or replacement.
Look for light leaks inside the container—any visible daylight means potential leaks.
7. Rust and Corrosion: How Much is Too Much?
Some surface rust is normal, but excessive corrosion can weaken the container.
✔ Check the roof, corners, and bottom rails for signs of deep rust.
✔ If rust has eaten through the steel, it may be too far gone for practical use.
✔ Cargo-ready containers are treated and repainted, making them a better long-term choice than as-is watertight containers.
8. Modifications: Do You Need Custom Features?
Depending on your intended use, you may want a container that already has modifications or is suitable for customization.
✔ Storage Use: Ventilation, shelving, roll-up doors.
✔ Living/Office Space: Windows, insulation, electrical wiring, HVAC.
✔ Workshops or Special Use: Side openings, additional access doors, reinforced flooring.
If buying a used container for modifications, ensure the structure is sound before investing in upgrades.
9. Delivery and Placement: Logistics Matter
Access Space: Ensure you have enough room for a delivery truck to drop off the container.
Foundation: Avoid placing directly on soil—use gravel, concrete blocks, or steel beams for better longevity.
Permits: Some locations require permits for storage containers, especially for long-term placement.
10. Budget: Balancing Cost vs. Quality
One-trip containers: Most expensive, best condition (~$4,000–$7,000).
Cargo-ready (refurbished): Mid-range, great value (~$3,000–$5,000).
Watertight (as-is): Cheapest option, but may need repairs (~$2,000–$4,000).
✔ Spending more on a cargo-ready or one-trip container can save long-term maintenance costs.
✔ If buying used, factor in additional costs for repairs, repainting, or modifications.
Conclusion: Make an Informed Purchase
Buying a shipping container is a long-term investment, and choosing the right one requires careful consideration. Focus on:
✔ Container condition (new vs. used)
✔ Size and material quality
✔ Weatherproofing, rust, and floor condition
✔ Modifications and placement logistics
✔ Budget vs. longevity
If you want a container that lasts for decades with minimal upkeep, a cargo-ready or one-trip container is the best choice. Take the time to inspect before you buy and choose a supplier that offers high-quality, structurally sound containers for your needs.