Porta Cabins in Bangalore – Types, Sizes & Prices

An MS (mild steel) cabin is fabricated the traditional way. A structural steel frame — typically IS 2062 Grade A, with a channel chassis and square-pipe posts — gets clad in corrugated or plain MS sheet, insulated in the cavity with mineral wool or a similar filler, and lined on the inside with cement board, ply or metal.

It is the heaviest and toughest of the three. Nothing on a construction site meaningfully damages a well-built MS cabin. Scaffolding leaning against it, a stray reversing tipper, vibration from a nearby crusher, workers dragging equipment past the wall every day — an MS cabin absorbs that and keeps going. Design life on a properly painted and maintained unit runs to 20–25 years, and if a panel does get dented, any local fabricator can cut it out and weld a new sheet in.

Where it lets you down: heat. Mineral wool in a cavity is decent insulation, but the steel skin itself is a superb conductor, and every stud and frame member is a thermal bridge carrying outdoor heat straight through the wall. In a Bengaluru winter you will not notice. In a Nagpur or Ahmedabad summer, an MS cabin without serious insulation upgrades becomes an oven by 2 pm, and you will pay for that in air-conditioning every month it stands.

It is also heavy, which means a crane or hydra to lift it, and it makes noise — rain on an MS roof is loud enough to interrupt a phone call.

A PUF cabin uses the same idea for the frame but replaces the skin entirely. Instead of sheet plus loose insulation, the walls and roof are sandwich panels: two pre-painted steel skins with a rigid polyurethane foam core injected between them, usually 50–60 mm thick for cabins, at a core density around 40 kg/m³.

That core is the point. PUF is one of the better commercially available insulators — a 60 mm panel typically lands near a U-value of 0.38 W/m²K, which is a different league from a sheeted-and-stuffed wall. In practice it means a PUF cabin that has been sitting closed in the sun is noticeably cooler when you open the door, a 1.5-ton AC actually holds the room, and the compressor cycles off instead of running flat out.

The panels also arrive factory-finished on both sides, so a PUF cabin looks cleaner out of the box: flat white or beige walls, no visible framing, no separate lining trade. And it is light. A PUF cabin of the same size weighs far less than its MS equivalent, which makes transport, offloading and re-siting cheaper and quicker.

Where it lets you down: the panel is not structural in the way steel sheet is. A hard knock leaves a permanent dent, and once the outer skin is punctured the foam is exposed to water. You cannot hammer that out — you replace the panel. On a busy site with material movement all around the cabin, PUF walls collect damage that MS would have shrugged off. Cheap panels are the bigger risk: low-density foam shrinks over a few years, opening thin gaps at the joints that let heat and water back in. Panel density and skin gauge are worth asking about specifically, because they are exactly where a low quote gets its low.

A container cabin is a repurposed ISO shipping container — usually 20 ft or 40 ft — cut, insulated, lined, wired and fitted out as a room. The shell is Corten weathering steel, engineered to be stacked nine high on a rolling ship deck and to survive years of salt spray. It is by a wide margin the strongest of the three.

That strength buys you two things nothing else offers. First, real security: a locked container with its original doors is a serious barrier, which matters when the unit sits unattended on a remote site over a long weekend. Second, genuine repeat mobility. A container is designed for handling. It goes on a trailer, gets lifted by standard equipment at the corner castings, and arrives at the next site unharmed. If your cabin will move four or five times over its life, this is the format that survives it.

Where it lets you down: the dimensions are fixed and they are not generous. A 20 ft container gives you roughly 145 sq ft of internal floor at about 2.35 m wide — a corridor, not a room — and standard height leaves under 8 ft of ceiling before you have lost any of it to insulation and lining. Every layer of comfort you add eats into a space that was tight to begin with.

It is also the format where the sticker price is most misleading. A used 20 ft container shell in India commonly sells in the ₹75,000–₹1,20,000 range depending on grade, age and location. That is a box, not an office. Cutting openings, framing and fitting windows and a door, insulating (and it needs proper insulation — bare steel in the sun is brutal), lining, flooring, wiring and painting routinely costs more than the shell did. Compare delivered, finished, ready-to-occupy totals or the comparison is meaningless.

Two more things buyers discover late: an old container may have carried anything, so check the flooring and ask about the CSC plate and history; and once it is on site, a container is hard to modify. Cutting into a structural side wall without proper reinforcement weakens the whole shell.