How to Inspect a Used Container Before Buying (10-Minute Checklist)
How to Inspect a Used Container Before Buying (10-Minute Checklist)
Buying a used container without inspecting it is like buying a used car without opening the hood.
Sure, it might work out. But you're gambling.
This 10-minute checklist tells you exactly what to look for so you don't end up with an expensive problem.
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Why Inspect?
Even "certified" containers can have hidden issues. And not all sellers are honest about condition.
What you're looking for:
- Structural problems that make it unsafe
- Damage that costs significant money to repair
- Issues that make it unsuitable for your use
10 minutes now saves you weeks of headaches and costly repairs later.
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The 6-Part Inspection System
1. Structure and Frame
What to check:
- Corner posts (the 4 vertical beams)
- Top and bottom rails
- Crossmembers (interior ceiling beams)
What you're looking for:
- Dents or bends: Minor is OK, severe is structural problem
- Rust at corners: Small is OK, perforation is critical
- Welds: Should be intact, not cracked or failing
How to test:
- Press on corners with your hand — should feel solid, not flex
- Look inside at ceiling beams — shouldn't be sagging
Red flag: Any corner post that's significantly bent or rusted through.
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2. Rust Inspection
Not all rust is equal. You need to know the difference.
Surface rust (OK to buy):
- Orange/brown color
- Scrapes off easily with tool
- Doesn't penetrate metal
- Can be cleaned and painted
Structural rust (problem):
- Holes you can see through
- Metal flaking off in chunks
- Rust that goes through to the other side
- Weak spots when you press
Where to check closely:
- Top corners (water accumulates)
- Bottom rails (ground moisture)
- Around doors (water entry point)
- Roof (sun damage)
- Weld lines (water penetrates here first)
Rule of thumb: Surface rust on 30% of container is acceptable. Structural rust on 10%+ is a problem.
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3. Floor Condition
The floor is expensive to repair.
What to check:
- Walk entire floor — does it feel solid?
- Look for holes, cracks, or soft spots
- Check for dark stains (water damage)
- Smell for mold or persistent dampness
What's acceptable:
- Surface scratches and marks
- 1-3 boards with light wear
- Small cracks (<1 inch)
What's NOT acceptable:
- Soft/spongy boards when you step
- Large holes or cracks (>2 inches)
- More than 30% of floor damaged
- Completely rotten boards
- Rusted metal structure underneath
Test: Jump on questionable spots. Floor should feel solid, not bounce or crack.
Repair cost if needed: Considerable investment for complete floor replacement
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4. Doors and Seals
If doors don't seal, you have water and security problems.
What to check:
Door operation:
- Both doors open and close smoothly
- Hinges aren't bent or broken
- Locking bars engage properly
- Handles work correctly
Seals:
- Rubber gaskets intact (not cracked/missing)
- Doors close completely (no gaps >½ inch)
- Even seal all around door frame
How to test:
Paper test: Close doors with a piece of paper in the seal. If you can easily pull it out, the seal is bad.
Light test: Close yourself inside (with someone outside!). Look around door edges. If you see significant light, water will get in.
Repair costs if needed:
- New gaskets: Moderate expense
- Hinge adjustment: Moderate expense
- New doors: Very expensive
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5. Interior Condition
Don't just look — use your nose and touch.
What to check:
- Walls: Look up at ceiling corners for rust/holes
- Ceiling: Should be intact, no sagging
- Smell: Musty/moldy smell means water got in
- Condensation: Damp walls mean ventilation problem
Red flags:
- Strong mold smell (health hazard + damage)
- Water stains on ceiling or walls
- Daylight visible through walls/ceiling
- Rusted interior surfaces
- Evidence of chemical spills
Pro tip: Bring a flashlight. Shine it along walls and ceiling at an angle — reveals imperfections you can't see otherwise.
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6. Light Test (Most Important)
This test reveals every hole and crack.
How to do it:
1. Enter container 2. Close both doors completely 3. Let your eyes adjust (30 seconds) 4. Look for ANY light coming through
What you're looking for:
- Pinhole leaks in roof
- Gaps in walls
- Door seal failures
- Corner deterioration
Rule: If you can see light, water will get in.
Exception: Tiny pinpricks of light at top corners can be acceptable if everything else checks out. But larger light (pencil-width or more) is a problem.
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Scoring System
Give points for each section:
| Section | Good (2 pts) | Acceptable (1 pt) | Problem (0 pts) |
|---|---|---|---|
| Structure | Solid, no damage | Minor dents/surface rust | Bent posts, holes |
| Rust | Minimal/surface only | Surface rust <30% | Structural rust, perforations |
| Floor | Solid, minor wear | Some worn boards | Soft spots, holes |
| Doors | Perfect seal | Minor gaps, working | Won't close, broken |
| Interior | Clean, dry | Some stains, no smell | Moldy, damaged |
| Light test | No light | Few pinpricks | Visible light/gaps |
Score interpretation:
- 10-12 points: Excellent container, buy if pricing is reasonable
- 8-10 points: Good container, minor issues are acceptable
- 6-8 points: Usable but has problems — negotiate significant discount or walk away
- Below 6: Too many problems — walk away
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Questions to Ask the Seller
While inspecting, ask:
1. "What grade is this container?" (CW, WWT, or none) 2. "What was it used to transport?" (Food grade? Chemicals?) 3. "How long has it been sitting here?" (Longer = more deterioration) 4. "Can I see the CSC plate?" (Manufacturing date and certification) 5. "Any known repairs done?" (What and when) 6. "Why are you selling?" (If answer seems sketchy, be careful)
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Red Flags That Mean "Walk Away"
🚩 Seller won't let you inspect before paying 🚩 "It's all good, trust me" without letting you look inside 🚩 Strong chemical smell inside 🚩 Structural rust or holes in walls/roof 🚩 Floor more than 30% damaged 🚩 Significant visible light through walls in light test 🚩 Seller has no business location (operates only via WhatsApp) 🚩 Price is "too good to be true" without clear reason
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What to Bring
- Flashlight (essential for light test)
- Screwdriver (test rust — scrapes off or goes through?)
- Paper (for door seal test)
- Measuring tape (verify dimensions if needed)
- Camera/phone (document any issues)
- This checklist (print it out or save on phone)
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Final Tips
1. Always inspect in person — Never buy based only on photos 2. Bring someone knowledgeable — Second opinion is valuable 3. Take your time — Don't let seller rush you 4. Document everything — Take photos of any issues 5. Trust your gut — If something feels wrong, walk away
Still early in the process? Our guide to buying a container walks you through every step.
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Have doubts about a container you're looking at? Send us photos via WhatsApp. We'll tell you if it's a good buy or if you should keep looking.
Free service. 10-minute turnaround.