Shipping Containers with Side Doors

A 40-foot container has one way in — and it is 40 feet from the back wall.

If what you need is buried in the middle, you unload everything in front of it first. Every time. That is the whole reason people call us about side doors.

We cut side access into containers from 10ft to 45ft — a single door, a pair, a roll-up, or a full open side — and we reinforce the frame so the container stays square, stays weathertight, and stays a container you could still ship.

Which kind of side access do you actually need?

Full open side

The entire long wall opens, usually as four doors folding back flat against the container. Best for forklift access to any pallet, equipment you drive in and out, and retail or display builds that open to the street.

Single or double side door

A standard-height doorway cut into the long wall, hinged like the original cargo doors. Best for getting people and hand-loaded goods in without walking the length of the box. Cheaper and structurally lighter than a full open side.

Roll-up door

An overhead door that rolls up into a canister above the opening — no door swing, no arc of space to keep clear. Best for tight sites, driveways and storefronts. This is the single most requested modification we get.

Doors on both ends (tunnel container)

Cargo doors at each end, so the container is a drive-through. Best for loading from one side and unloading from the other, pass-through storage, or splitting one container between two users.

Man door

A personnel door, usually 36 inches, with a lockset and weather seal. Best for daily access when you do not want to swing the big cargo doors every time.

Side access options compared

Cutting a container is structural work. Here is what that means.

The long walls of a shipping container are not decoration. The corrugated steel is a stressed skin — it carries load and it is what keeps the box square. Cut an opening into it without putting the strength back, and the container racks out of true. A container that is out of true does not seal, and a container that does not seal leaks.

So every opening we cut gets a welded steel frame around it, sized to the opening, and the door hardware mounts to that frame rather than to the skin. Doors get new gaskets. Cut edges get primed and painted so they do not start rusting from the inside of the cut.

This is also why a modified container should be set down level, on a firm foundation, supported at the four corner castings. It matters on any container. It matters more on one with a large opening in the side.

Sizes we modify

10ft · 20ft standard and high cube · 40ft standard and high cube · 45ft high cube — side door, full open side, roll-up, doors both ends, or man door.

New one-trip or used cargo-worthy, your call. A one-trip container gives you clean steel to cut and a better finish; a used container costs less and works just as hard.

What people use side access for

• Contractors — tools and materials on a job site, reachable without emptying the container
• Farms and ranches — feed, tack and equipment through a tractor-width opening
• Retail and food — a container that opens to the street and closes up at night
• Warehousing overflow — pallet in, pallet out, without a forklift aisle inside
• Workshops — light and air through a big opening, secure steel when it is shut
• roll-up door conversions — no swing clearance needed, opens in one motion.
• double door and tunnel containers — cargo doors at both ends, so you can load straight through or split one container between two users.

Common questions

Does cutting a side door void the container’s structural integrity?
Not when it is framed properly. We weld a steel frame around every opening so the load path around the cut is restored. Without that frame, yes — the container will rack and start to leak.

Can a modified container still be shipped by sea?
A container loses its CSC plate once it is structurally modified, so it is no longer certified for international shipping. It can still be trucked and craned normally, which is what almost every customer needs.

Which is better, a roll-up door or swinging side doors?
Roll-up if space in front of the container is tight, or if you open it many times a day. Swinging doors if you want the widest possible clear opening and do not mind the door swing.

Can you add side doors to a container I already own?
Yes, if it is sound. Send photos of the walls, floor and roof and we will tell you honestly whether it is worth modifying or whether you are better off starting with a better shell.

Do modified containers still lock?
Yes. Roll-up doors take a padlock at the base; side and man doors take a lockbox or a standard commercial lockset.

Start from the right base container

Side access can be cut into any size we stock. If you have not chosen a base container yet, start here:

• 20ft shipping containers — the most common base for a single side door or a roll-up.
• 40ft shipping containers — the usual choice for a full open side, because there is length to give up.
• one-trip containers — straight walls and clean paint, which makes a cut opening look finished rather than patched.
• all container modifications — windows, insulation, electrical, partitions and paint.
• delivery and site preparation — a modified container still needs level ground on all four corner castings.

Tell us what you need

Send the size, the kind of opening, and the delivery zip code, and we will come back with a delivered price. If you are not sure which door suits the job, say what you are storing and how you load it — that is usually enough for us to tell you.