Container Home Glossary: Every Term You Will Meet, Explained

Buying a container home means reading quotes, shipping documents and engineering notes that assume you already know the vocabulary. This glossary covers the sixty terms that actually come up, in the order you tend to meet them: first the container itself, then the structure, then shipping and delivery, then the paperwork. Bookmark it, because you will come back to it in the middle of a quote conversation.

The container itself

Shipping container. A steel box built to ISO standards for freight. The standard sizes are 20ft and 40ft; a 40ft high-cube is taller, at 9ft 6in.
ISO container. A container built to International Organization for Standardization dimensions so it can be stacked and lifted anywhere in the world.
CSC plate. The safety approval plate riveted to every freight container, certifying it passed structural inspection. A container without one has not been certified for freight.
Corner casting. The eight reinforced blocks at the corners of a container. Every load path, whether lifting, stacking or securing, runs through these.
Twist lock. The locking mechanism that engages a corner casting to hold containers together, or to hold one to a trailer.
Corten steel. A weathering steel alloy used in most containers. It forms a protective surface layer instead of rusting through.
High cube. A container one foot taller than standard, at 9ft 6in instead of 8ft 6in, giving extra internal headroom.
One-trip container. A box that has carried cargo once, usually from Asia. Effectively new, and the best condition you can buy.
Cargo worthy. A condition grade meaning the container is still certified to carry freight. Cosmetic damage is acceptable under this grade.
Wind and watertight. A lower condition grade. The box keeps weather out but is no longer certified for cargo.
Cut-down container. A container shortened in length for a specific build. Shortening changes the structural load path and must be engineered.
Container modification. Any structural change to a container, including cutting openings, removing walls or joining boxes.

Structure and build

Corner post. The vertical steel column at each corner. It is load-bearing, and should never be cut without engineered reinforcement.
Framing an opening. Adding a steel frame around a new door or window so the load path you removed is replaced.
Structural integrity. Whether the box still carries loads the way it was designed to. This is the central question in any modification.
Expander unit. A folding or sliding container that unfolds to roughly double its footprint once on site.
Fold-out section. The hinged wall or slide-out portion of an expander unit.
Shell. The bare container before any interior fit-out.
Fit-out. Everything added inside: insulation, lining, wiring, plumbing, joinery and finishes.
Turnkey. A unit supplied fully finished and ready to occupy, as opposed to shell-only.
Pod. A pre-built bathroom or kitchen module inserted into the unit. Common where site labour is expensive.
Bolt-on. An accessory fixed with bolts rather than welded, so it can be removed later.
Corten weathering. The surface oxidation that gives a container its brown patina. It is cosmetic, and it slows down over time.
Pitting. Localised deep corrosion. Unlike surface rust, pitting is a genuine structural concern, so inspect for it.
Deck. The container floor, normally plywood over steel cross-members. Marine ply is standard; check for soft spots.

Foundations and site

Pad foundation. Concrete pads at the corner points. The simplest and most common foundation for a container home.
Plinth. A raised base that lifts the unit clear of the ground. It keeps the floor dry and allows access underneath.
Ground screws. Screw-in piles used instead of concrete. Faster and removable, and useful on sloping or sensitive sites.
Levelling. Getting the unit perfectly true. Containers are rigid, so a twisted base will distort doors and windows.
Site survey. A measured check of levels, access and services before delivery.
Clearance. The space needed around the unit for lifting equipment and access.
Setback. The distance a structure must sit from a boundary, as set by local planning rules.
Hardstanding. A firm, level surface able to carry a loaded delivery vehicle.
Crane lift. Lifting the unit into position with a crane rather than sliding it off a trailer.
Hiab. A truck-mounted crane. Cheaper than a separate crane where access allows.

Shipping and delivery

FOB. Free On Board. The price covers the goods loaded onto the ship at the origin port. You pay freight and everything after.
CIF. Cost, Insurance and Freight. The price includes shipping to your destination port. You still pay port handling and onward transport.
EXW. Ex Works. You collect from the factory. Rarely the cheapest option once you add collection.
DDP. Delivered Duty Paid. The seller handles everything including import duty. The most expensive but the least work.
Port-to-port. Delivery that ends when the unit reaches your port. You arrange collection from there.
Bill of lading. The shipping document that acts as both receipt and title. You need it to collect the goods.
Packing list. A document itemising exactly what is in the shipment.
Commercial invoice. The customs document declaring value and contents. Errors here cause delays.
HS code. The international product classification code used for duty. Container homes fall under specific codes depending on whether they are entered as complete structures.
Customs clearance. The process of getting goods released by your country's customs authority.
Demurrage. A charge for keeping a container at the port beyond the free period.
Detention. A charge for keeping equipment beyond the free period after collection.
Freight forwarder. A company that arranges shipping on your behalf and handles the paperwork chain.
Bonded warehouse. A secure facility where goods can be stored before duty is paid.
LCL. Less than Container Load, meaning sharing a container with other shippers. Rarely sensible for a whole home.

Money and paperwork

Quotation. A fixed price offer with a stated validity period. Always ask what it includes before comparing it with another.
Ex-works price. The factory price before any freight. Useful for comparing suppliers on a like-for-like basis.
Unit price. The cost of the home itself, excluding freight, duty and installation.
Landed cost. The true total: unit, freight, duty, port charges, transport to site and installation.
Bank transfer. The standard payment method for international container purchases. Payment terms are usually a deposit with the order and the balance on shipping.
Proforma invoice. An invoice issued before goods ship, used to arrange payment.
Certificate of origin. A document stating where the goods were made. It can affect duty rates.
Inspection certificate. Third-party confirmation that the goods match the specification.
Bill of materials. A full list of the components supplied with the unit.
Delivery term. The shorthand that defines where the seller's responsibility ends. Get it in writing on every quote.

Frequently asked questions

What is the difference between FOB and CIF?

FOB means the price covers the unit loaded onto the ship at the origin port, and you pay freight onwards. CIF means the price also includes the sea freight and insurance to your destination port. Neither includes port handling, customs duty or transport from the port to your site.

What does turnkey actually mean on a container home quote?

It means the unit arrives finished and ready to occupy. Ask specifically whether it covers electrical connection to the local supply, plumbing hook-up and delivery to site. Suppliers use the word loosely, and the gaps are where budgets overrun.

Why does the CSC plate matter if I am not shipping cargo?

It is the clearest evidence that the box was built and maintained to a real structural standard. A container with a valid plate has been inspected. One without has an unknown history, which matters when you are about to live in it.

What is landed cost and why should I calculate it first?

Landed cost is the true total of unit plus freight, duty, port charges, local transport and installation. It is the only number worth comparing between suppliers, because a cheap unit with expensive freight can easily cost more than an expensive unit close to a port.