20FT Expandable Container House in Charcoal Stacked-Stone Cladding with Black Frame

This is the 20FT expandable container house in charcoal stacked-stone, with a near-black frame and a glazed entrance bay that runs the full height of the front wall. Folded, it is a 2,200 mm wide box on a truck. Opened, it is 38.2 m² of floor, two rooms and a bathroom — and from six metres away, on a garden lawn with a timber deck in front of it, it does not read as a container at all.

A dark facade is a different material problem

Everyone who sells stone-look cladding shows you a wall that has just been washed. The useful question is what the wall looks like after two winters, and on a charcoal face the answer is not the same as on a light one.

On a pale stone wall, the marks that show are dark: algae in the shade, dirt running off a window head, a black line under every ledge. On a charcoal wall the same water leaves the opposite mark — white. Salts and dust wash out of the joints and dry as pale streaks down the face, and a wall that was uniform in July has a faint grey map on it by March. Neither wall is dirtier than the other. They fail differently.

Three things decide which way it goes, and none of them is the colour:

• Whether water is given somewhere to leave. A face that runs water straight past a window and onto the wall below will streak whatever colour it is. The detail that matters is the head and the sill, not the panel.
• How the joints are laid out. Boards butted in a straight vertical line shed water in a straight line. Staggered joints break the run.
• What happens at the bottom. The splash zone is the first 300 mm. On this unit the cladding stops at a dark plinth rather than running into the ground — so the dirty band that every building gets at ankle height is a dark band on a dark building, instead of a grey smear on a coloured one.

That is the whole case for charcoal: it is not a wall that stays clean, it is a wall whose dirt is the same colour as the wall.

A dark skin runs hot, and that is a specification question

Absorptivity is real. A charcoal face in direct summer sun will sit well above air temperature — noticeably hotter to the hand than a white one, and hottest on a west elevation at four in the afternoon. What that does not do is make the room behind it hot, because the insulation is behind the skin, not in it: the 75 mm panel is doing the work, and the surface temperature is a maintenance question rather than a comfort one.

It becomes a design question in two places. Planting: a shrub 200 mm from a hot dark wall will scorch, so the drawing should hold plants back from the face. And colour choice for the base and the frame — the plinth, the door frame and the window frames on this unit are all in the same dark family as the stone, which is why the building reads as one mass instead of a container with a stone picture pasted on it.

The entrance bay is the design

The front elevation is not a door in a wall. The whole centre of the module is glazed: a full-height double door, flanked on both sides by fixed panes, held in the same dark frame as the cladding. At eye level there is no wall — only a slot of light the height of the room.

That single move does the work that a porch or a canopy usually does, and it costs nothing in footprint: it tells you where the building starts, it puts daylight into the middle of a 6.48 m deep plan, and it lets the interior read as a room from outside. The fixed panes are the part most buyers underestimate — a glazed door alone in a stone wall reads as a hole; a glazed bay reads as an entrance.

Dark shell, light interior

Inside it goes the other way on purpose. In a 38.2 m² unit a dark interior is a cave, so the walls and ceiling are light, and the dark is used only as line: the corner trim, the ceiling edge, the window frames, the interior door frame. The result is a light room with a drawn edge, which is how small rooms get to feel bigger than they are.

What is actually in the unit:

• Light grey wall panels with black corner and ceiling trim, and a single surface-mounted LED per bay.
• A grey-green PVC floor over 18 mm magnesium board — quiet underfoot, tolerant of grit, and it does not show sand the way a dark floor does.
• A black-framed interior door with a glazed panel, so the back room borrows light from the front.
• Dark-framed windows with a light internal reveal, which is why the openings read as cut into the wall rather than fixed onto it.

Specifications

Sizes above are the standard expandable series. Any change to the layout, the glazed bay or the cladding is confirmed on the drawing before production — send us the plan and we will mark up what moves.

Material build-up

• Structure — Q235 hot-dip galvanized steel frame, 2.5–3.0 mm, welded corner assemblies with 6 mm head liner plates; the folding hinge line is on the long wall.
• Walls — 75 mm EPS sandwich panel as standard (100 mm, rock wool or PU on request), internal partitions 50 mm.
• Exterior skin — charcoal stacked-stone decorative board over the panel; it is a face, not a structural layer, which is why the unit still weighs 3.4 t and still ships two to a 40HQ.
• Roof — 0.35 mm corrugated colour steel over 50 mm EPS, with a 200-type ceiling board below.
• Floor — 18 mm fireproof magnesium board plus 2.0 mm PVC (4.0 mm SPC on request).
• Openings — casement windows with insect screens and dark frames; full-height glazed entrance bay with double tempered glass.
• Electrical — surface wiring in conduit, LED ceiling lights, sockets and switches to the destination standard (CE / IEC).
• Service life — 15–20 years with normal maintenance; wind resistance to 200 km/h and seismic to magnitude 9 in the standard configuration.

From truck to building

• Level the ground and set the pads. Four to six concrete blocks or a strip footing; the unit must be level before it opens, because the two halves ride on the same frame.
• Open the long wall. Manual or hydraulic; the panel folds out on its hinge and becomes the floor of the new half.
• Lock the joint. Bolts along the hinge line, then the roof and floor seams are sealed and taped.
• Connect services. One power feed, one water, one drain; the bathroom is already plumbed and pressure-tested inside the module.

A small crew with hand tools and one lift can do this in a day; no welding, no wet trades, no curing time.

Where this version earns its money

• Annexe or granny flat — a dark stone face sits quietly beside brick, render or timber cladding, and the glazed bay gives the annexe its own front door instead of a door in the host wall.
• Pool house or garden studio — the charcoal skin does not flare in sunlight the way a white or gloss panel does, and it does not show pool splash the way a light wall does.
• Lodge key or glamping unit — reads as a cabin from the car park, opens as a room with a wet bathroom.
• Small retail or reception — the glazed bay is a shop window; the interior is a clean light box behind it.
• A site office that has to look permanent — for clients whose project runs for years and whose neighbours complain about cabins.

Shipping, and what arrives on site

Two units per 40HQ, each folded to 2,200 mm and strapped to its own base. The stone face is protected with corner boards and a film that stays on until the unit is set, which is why the tape you can see on the windows in our factory photographs is still there — it comes off before delivery, not after installation.

Send us the destination port, the ground conditions and the layout you need, and we will confirm the packing, the drawings and the price.

About the manufacturer

Global Container (Suzhou) Co., Ltd. builds expandable, detachable and flat pack container houses in Suzhou, China, and ships them worldwide. Every unit is assembled and inspected in our own workshop before it is folded and packed — the photographs on this page are of the actual unit, on our factory floor, not of a show home.

Send us your layout, destination and quantity, and we will come back with drawings, a packing plan and a price.