Three categories, not two
In the trade you will meet three fundamentally different offers, often all listed under “buy a container”.
| Category | What it is | Typical origin |
|---|---|---|
| New build | Factory-new, often made to your specification | Manufacturers of room and office containers, custom builds |
| One-way | New shipping container after a single sea voyage | Built in Asia, shipped to Europe with cargo |
| Used | Retired after years in sea service or hire fleets | Shipping lines, leasing companies, hire firms |
The difference between new build and one-way is often overlooked. A one-way container is a standard shipping container that has crossed the ocean once loaded – practically new, but in exactly the configuration it was built in. A new build, by contrast, is made to your requirements: with windows, insulation, electrics and doors where you need them. This applies above all to insulated room and office containers, which never go to sea anyway.
Why one-way containers are so common is explained in The history of the container.
The categories compared
| Criterion | New build | One-way | Used (wind and watertight) |
|---|---|---|---|
| Price level (shipping container, rough) | only meaningfully comparable with custom specs | 100% | approx. 50–70% |
| Expected remaining life on land | several decades | several decades | heavily condition-dependent, often 10–25 years |
| Appearance | flawless, colour of your choice | near-flawless, shipping line colour | dents, rust spots, stickers, traces of old markings |
| Tightness | guaranteed | generally guaranteed | must be checked |
| History | none | one cargo | unknown cargoes over years |
| Warranty | full | full | may be restricted when buying from dealers |
| Lead time | weeks to months | usually from stock | usually from stock |
| Resale value | high, limited for custom builds | high | stays stable because already low |
The last row deserves a second look. A used container hardly loses any more value – the depreciation has already been borne by the previous owner. Sell it again after a few years and you often recover a large part of the purchase price. The figures are in Running costs and depreciation.
The decision by use
| Use | Recommendation | Reason |
|---|---|---|
| Store for tools, materials, machinery | used | tightness matters, appearance does not; minimal depreciation |
| Store for sensitive goods (paper, textiles, electronics) | used, carefully checked, or one-way | tightness and condensation protection decisive |
| Construction site store, frequently relocated | used | it will take a beating anyway |
| Workshop with power supply | used or one-way | check the condition of floor and walls |
| Sales stand, pop-up, catering | one-way | appearance is part of the product |
| Conversion to office, habitable room, tiny house | one-way or new build | the shell is a small share of cost; rust behind insulation is fatal |
| Insulated office or room container | new build or a well-kept ex-hire unit | insulation, windows and electrics age too |
| Shipping it yourself | one-way or used with valid CSC plate | approval required |
The biggest mistake with conversions
In conversion projects, the cheap used container regularly turns out to be the most expensive decision.
The arithmetic behind it: in a full conversion to an office or living space, the container itself accounts for only around 15 to 25 per cent of total cost; the rest is spread across insulation, windows, electrics, plumbing and interior fit-out. Saving €1,000 on the container therefore saves only a small fraction of the budget – but takes on a considerable risk.
Because once the conversion is complete, the steel shell has disappeared behind insulation and lining. A rust spot that looks harmless today keeps working unseen. A leak in the roof soaks the insulation before anyone notices. The repair then means: lining off, insulation out, steel repaired, everything redone. That costs many times the original saving.
A breakdown of fit-out costs by trade is in Fit-out costs by trade.
Rule of thumb: the more money you put into the interior, the better the shell should be. For storage, used is fine; for living space, one-way is the safe choice.
What you cannot see on a used container
The visible defects – dents, rust, bent doors – can be spotted during an inspection. Some risks, however, cannot be seen.
Previous cargoes. A container that has spent years in sea service has carried all sorts of things. As a rule this is unproblematic. If you plan to convert the container into a habitable room or store food in it, ask about its history and look out for odours, discolouration and hazardous goods labels or their remains.
Treated timber floor. The plank floors of shipping containers are usually treated with wood preservatives against insects and fungi – for new and used containers alike. For storage this does not matter. For a habitable room the floor is usually removed or permanently sealed over.
Painted-over rust. A fresh coat of paint makes a container look well maintained but can hide rust. Look for blistering in the paint, particularly on the bottom side rails, at the corners and around the door.
Previous repairs. Welded-in patches are not a reason to walk away, but they should be neatly executed. On the roof and floor they are a signal to look more closely.
Distorted structure. A container that was once heavily overloaded or lifted incorrectly may be slightly out of square. You notice it when the doors are hard to close or the seals do not sit evenly all round.
The full inspection checklist for a site visit is in Buying a used container.
Warranty: the legal difference
When buying new you have the full statutory warranty. When buying used, it depends on whom you buy from and whether you buy as a consumer or a business.
| Constellation | Warranty (principle, German law) |
|---|---|
| New, dealer to consumer | full statutory warranty |
| Used, dealer to consumer | may be shortened but not excluded |
| Used, dealer to business | may be excluded by contract |
| Used, private to private | may be excluded |
For businesses this means: a used purchase is often “bought as seen”. All the more important are a thorough inspection, or at least current photos of the specific container, and a written description of its condition in the purchase contract. The details are in Purchase contract and warranty.
Decision aid in four questions
- Will the container be converted? If yes: one-way or new build. If no: go to question 2.
- Is appearance part of the purpose? Sales stand, customer contact, representation – then one-way. Otherwise continue.
- Are you storing sensitive goods? Then used, but with particularly careful checking of tightness, or one-way. Otherwise continue.
- Will the container go back to sea? Then only with valid CSC approval. Otherwise: used, wind and watertight – in this case almost always the economically best choice.
Important note
All prices and percentages are rough orientation values without guarantee and vary with market conditions, steel prices and region. The notes on warranty are general in nature and do not constitute legal advice; the specific contract and the rules applicable in the individual case are authoritative.
Conclusion
New, one-way or used is not a question of quality but of purpose. For storage, workshops and construction sites a checked used container is almost always the best choice, not least because it hardly loses value any more. But as soon as you put a lot of money into an interior fit-out, the picture reverses: the shell is then only a small part of the cost but the greatest risk, and a one-way container or new build is the more prudent investment.
Further reading: Buying a used container, Reading the container number and CSC plate and Comparing quotes and negotiating prices.