Shipping container modifications — what is safe to cut and what is not
Doors, windows, roller doors, lining, insulation, power and shelving: what can safely be cut into a shipping container, what carries load, and when to buy new.

Guide · 8 min read
There is no universal answer to hire or buy, but there is a straightforward way to work out your own. It turns on three things: the length of time involved, whether the up-front cost suits you, and what happens at the far end. The arithmetic is simple once you know which numbers to put in it.
We will not put figures in a guide, because container prices and hire rates move with grade, size and availability, and the only numbers that matter are the ones on your quote. But the method does not change, and you can run it in two minutes with your own numbers.
Take the purchase price of the container at the grade you would buy. Take the monthly hire rate for the same size. Divide the first by the second. That gives you a break-even in months — the point at which accumulated hire payments equal the purchase price.
Then adjust for the three things that number leaves out:
Once residual value goes into the sum, the break-even usually lands sooner than the raw division suggests — often well inside a couple of years. As a rough rule: short and defined, hire. Long or open-ended, buy.
The comparison people run in their head is hire rate versus purchase price, and that comparison flatters buying. Two things sit on the other side of the ledger.
First, a hire unit is somebody else's maintenance problem. If a door seal fails or a roof develops a pinhole on a hire container, that is our issue. On a container you own, it is yours.
Second, a hire unit leaves. At the end of a project, a bought container that no longer has a job becomes a thing you have to sell, move, or find room for. If you have no use for it and nowhere to put it, its residual value is theoretical until you have gone through the effort of realising it.
Hire terms are not complicated, but they are worth reading rather than skimming. The items that actually matter:
Our terms are set out plainly on the container hire page, and if anything is unclear, ring and ask before you sign.
This is the most common hire surprise and it is entirely avoidable. A container delivered empty and collected loaded is not the same job.
An empty 20ft is a bit over two tonne. Full of household goods it might be five or six. Full of anything dense — tiles, pavers, machinery, steel, stock — it can be a great deal more. The truck that delivered it empty may not be able to lift it loaded, particularly a crane truck, whose lifting capacity drops sharply with reach.
Ground bearing changes too. A pad that carried the container through a dry spell can rut and pump under a loaded unit after a wet fortnight, and the truck has to drive on it. Plan the collection at the start: tell us what is going in, and empty it before the collection date unless we have agreed otherwise. The delivery page covers what each truck needs.
People buy a container thinking of it as portable. It is transportable, which is a different thing. Moving a container you own is a truck job every time, quoted on distance and access at both ends, and there are two ends now rather than one.
Before it can move, it has to be empty or close to it, it has to be liftable — which means sound corner castings and rails — and both sites need the access for a truck. A container that has been sitting in a backyard for eight years while a pergola, a garden bed and a mature tree grew up around it is a crane job at best.
None of that is a reason not to buy. It is a reason to think carefully about where it goes on day one, because that decision is much more permanent than it feels while the truck is idling in the street. Getting the pads and the position right before the truck arrives is worth the hour it takes.
If you genuinely do not know how long you need it, hiring for a few months and then buying is not a wasted decision. You will learn whether the size is right, whether the position works, whether the access is as easy as it looked, and whether you actually use it. Those are expensive things to guess wrong on a purchase.
Some hire arrangements can be converted to a purchase. Ask at the start rather than the end — it is a much easier conversation before the paperwork is written.
Tell us how long you think you need it, what is going in it and where it is going. We will give you both numbers — the hire rate and the purchase price for the same size and grade — and you can do the division yourself. If hire is the better answer we will say so, and if you are three months off the break-even we will tell you that too.
Ring 0477 410 500, or send the details through the contact page. Sizes and current options are on the container range and the container sales page.
More guides
Doors, windows, roller doors, lining, insulation, power and shelving: what can safely be cut into a shipping container, what carries load, and when to buy new.
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