How to Inspect a Shipping Container Before You Buy

At Advanced Container Co., we thoroughly inspect every unit we sell—we will never offer a container that’s faulty or compromised.
If you choose to shop elsewhere, be sure to keep the following inspection tips in mind to protect your investment.

Do I need to Inspect a New “One-Trip” Shipping Container?

Yes—even new “one-trip” containers need a quick inspection. While they’re often in good condition with only minor scratches and dents, these containers have still made one ocean voyage from the manufacturing country (often China), which means they’ve been lifted, stacked, and possibly exposed to the elements. An inspection helps confirm there’s only cosmetic damage but no mechanical issues like a misaligned door.

New vs Used: Shipping Container Inspection Differences

New Shipping Containers Inspection

New containers are typically in good condition, but you should still check for any major dents, scratched paint, or door alignment issues that may have occurred during the shipping process. Confirm that the CSC (Container Safety Convention) plate is valid and that all seals and gaskets are intact.

Used Shipping Containers Inspection

Used containers need a more thorough inspection. Look for rust, corrosion, patch jobs, floor damage, and door functionality. Ask for the container’s grade and history—many used containers have seen years of service, and while some remain cargo-worthy, others are only suitable for storage.

How Containers Get Damaged Through Handling or Accidents

• Broken Doors: Doors take a beating during loading and unloading. If they’re bent or difficult to open, the container may not seal properly, which could allow water or pests inside.
• Major Dents, Scratches, and Holes: Large dents or punctures can weaken the container’s structure or allow moisture in. Evaluate whether surface imperfections are cosmetic or structural.
• Damaged in Transit: Road Accidents or Train Derailments: Containers transported by truck or rail are vulnerable to collisions and derailments. Always ask if the container has been involved in a transit-related incident.
• Dropped: Containers dropped during crane loading or unloading may have warped frames or structural issues. Look for misalignment and frame distortion.
• Heat Damaged: Containers exposed to intense heat, especially near fires or industrial accidents, may show warping, discolored paint, or compromised steel strength.
• Moisture Damaged: Rust stains, warped floors, and interior mold are all signs of moisture intrusion. Always inspect for leaks, water lines, or soft spots in the floor.

What You Can Ask the Seller

Depending on the unit, some of the answers may not be available.

1. What is the container’s age and manufacturing origin?
2. Has it been inspected or certified cargo-worthy?
3. Has it undergone any repairs or modifications?
4. If you can not come to our location: Are there photos available of the actual unit?
5. Is there a return or exchange policy if the container doesn’t meet expectations?

Types of Containers and Their Required Inspections

• Cargo-Worthy: Must pass rigorous inspections for structural soundness and safety. Check the CSC plate and overall condition carefully.
• Wind and Watertight (WWT): Intended for static storage. Inspect for leaks, rust, and floor damage to confirm weather resistance.
• One-Trip: Newer condition but still needs inspection for minor damage from shipping.
• As-Is: These containers can have significant wear or damage but are they also discounted and sold without guarantees.

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Vital Inspections: Key Areas You Shouldn’t Overlook

When evaluating a shipping container, a few areas carry the most weight: structural integrity, doors and seals, roof condition, and the presence of rust. These components directly affect how well the container will perform and how long it will last.

Structural Integrity and Overall Squareness

Start by examining the container’s frame and shape. A container should have clean, straight lines and maintain its rectangular form. If the structure appears skewed or leans like a parallelogram, this can signal major structural damage.
Small cosmetic dents are generally harmless, but large dents that distort the frame can impact the structural integrity and potentially interfere with stacking.

The steel beams that support the container floor are the cross members. If they are missing, the structural profile of the container changes. The most obvious sign of undercarriage problems is an uneven floor inside the container.

Cargo Doors, Locking Mechanisms, and Seals

The cargo doors are critical for both security and functionality. They rely on locking bars (also called latching gears) to secure the doors and stabilize it to keep the container from warping under load. Check these bars for bending or warping, which could affect the door’s performance.

While container doors are heavy, they should open without too much effort. If you struggle with stuck doors, it could point to frame warping or corroded hinges. Also, inspect for dents near the doors that might prevent a tight seal. Gaps along the bottom of the doors can let in pests, moisture, and debris—issues that quickly become costly.

Roof Dents and Pooling Issues

The roof deserves close attention. While it’s built with a slight crown to shed water, even minor dents can create pockets where rainwater, dirt, or salt collect. Over time, this can lead to rust or even holes. When inspecting the inside, look up—stains or light leaks are signs of roof damage that may not be visible from above.

Rust: What’s Normal and What’s Not

Some surface rust is normal, even on newer “one-trip” containers. Shipping containers are made from corten steel, which is designed to resist corrosion. In fact, light rust can act as a protective layer. However, if appearance matters, consider the time and effort needed to clean and treat rusty areas.

That said, deep or bubbling rust is a red flag. Known as “cancerous rust,” this type eats into the metal and often appears as blistered or raised patches beneath the paint. If you see signs of this, the container may be compromised—and not suitable for structural modifications or long-term use.

Additional Visual Exterior Inspections

• Check for Visible Damage, Rust, and Corrosion: Surface rust is common, but deep corrosion or holes are red flags.
• Overall Structure and Framework: Check for a strong, level frame. Warping or buckling indicates potential past damage.
• Corner Posts, Seams, and Top Rails: These structural components should be straight and rust-free. Bent or cracked posts could compromise safety.
• Wall Integrity: Push on the walls from inside and out. They should not flex excessively or show signs of impact.
• Paint and Coatings: Peeling paint may reveal rust. Industrial coatings should be intact for longevity.
• Bottom Edges: Often overlooked—check for rust, sharp edges, or signs of previous patchwork.
• Roof: Check for Dents, Holes, and Rust & Ensure Proper Sealing to Prevent Water Leakage. Water collects on the roof, making it prone to damage. Ensure it’s flat and sealed.
• Doors and Seals: Doors should open smoothly and seal tightly.
• Hinges and Locking Bars: Inspect for rust, bending, or broken welds. These are crucial for security and function.
• Door Seals and Gaskets: Gaskets should be pliable, not cracked or brittle.
• Corner Castings: Vital for stacking or lifting—look for cracks or rust that could weaken structural strength.
• Gaps and Door Alignment: Misaligned doors may indicate a warped frame or drop damage.

Additional Interior Container Inspections

• Flooring Inspection; Condition of Flooring Material & Detection of Water Damage or Insect Infestations: Marine-grade plywood floors should be firm, clean, and free of rot, soft spots, or infestation.
• Walls: Look for rust streaks, impact dents, and previous patch jobs.
• Crossmember Bars: Check under the floor—these support beams should be rust-free and intact.
• Ceiling: Should be free of rust holes, sagging, or light leaks.
• Ventilation: Look for installed vents—these help control moisture and odors.
• Verify the Absence of Odors or Contaminants: A clean container should smell neutral. Harsh chemical or mold odors suggest contamination.
• Signs of Pests: Look for droppings, nests, or chewed areas, especially in corners or beneath the floor.

Inspecting Modified or Custom Containers, if Applicable

If you’re buying a modified container—such as one with windows, HVAC, electrical wiring, or shelving—inspect all modifications for structural integrity, safety compliance, and quality of workmanship. Ensure that new openings are properly sealed to maintain weather resistance.

Important Considerations When Inspecting a Shipping Container

• Size and Grade: Know what size and grade you need—20-ft or 40-ft, cargo-worthy, wind and watertight (WWT), or as-is. Each designation affects what to inspect and how the container can be used.
• Inspect on Level Ground: Ensure the container is placed on level ground during inspection. This will give you a true sense of door functionality, structural integrity, and frame alignment.
• Examine the CSC Plate (Identification Marks): The CSC plate contains vital info: manufacturing date, identification number, maximum gross weight, and inspection status. It’s essential for containers that may travel internationally or be stacked.
• Water Tightness Test: Perform a simple light test or water spray test. Close yourself inside the container during daylight—if light comes through, water can too. A hose-down test can also reveal leaks.
• Using an Inspection Report for Insurance or Claims: Detailed inspection reports—including photos—can be useful when buying, renting, or insuring a container. They provide proof of condition, which can help you file claims or resolve disputes if damage occurs during transport or use.

Why It’s Important to Trust Your Container Provider; Buy from a Reputable Seller

With the rise of online scams and fraud, it’s more important than ever to purchase shipping containers from a trusted, established provider. Platforms like Facebook Marketplace and Craigslist have seen a surge in fraudulent listings—offering containers at too-good-to-be-true prices, demanding upfront payment, and then disappearing without delivering a product. Buyers who fall for these scams are left without a container and little recourse to get their money back.

That’s why it pays to work with a reputable company like Advanced Container Co.. With over 35 years of industry experience, we’ve built a strong reputation for quality, reliability, and customer service. We don’t just sell and rent containers—we stand behind every unit we provide. When you buy from us, you can expect full transparency, real photos of your container, a knowledgeable team, and a dependable delivery process. Whether you need a standard storage container or a custom-built solution, our expertise and integrity ensure you get exactly what you’re paying for—no guesswork, no risks, and no surprises.

Final Thoughts: Trust the Experts

Inspecting a container isn’t just about avoiding damage—it’s about making sure the unit is fit for purpose. When you buy from us, you get expert guidance, honest condition ratings, and a team that stands behind every container we sell.

Ready to buy or need help inspecting a container?

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