Guide
Light gauge steel, explained for island homes
Light gauge steel (LGS) is a building frame made from thin, high-strength steel studs instead of concrete columns and block walls. It has framed houses in Australia, New Zealand and North America for decades. On Koh Samui it is still new, and that is why we built a factory here.
What it is
Each stud is cold-formed from a coil of G550 steel, a grade with a yield strength of 550 MPa. Our roll-former shapes the coil into C-sections, cuts them to length and pre-punches the holes for screws, plumbing and wiring. The studs are joined into wall panels and roof trusses, then stood up on your slab.
The frame carries the house. Walls are closed with fibre cement or board outside and gypsum inside, with insulation in between. From the outside, a finished LGS villa looks like any other villa.
Built for salt air
Our steel carries a ZM275 coating: zinc, aluminium and magnesium, 275 g/m². It is made for coastal and tropical sites, where plain galvanised steel corrodes faster. The frame sits inside the wall, away from rain and sun, behind a breathable membrane.
Engineered to standard
- Steel to AS 1397 and Thai industrial standard TIS (มอก.).
- Frames designed to AS 4600, the standard for cold-formed steel structures.
- Every project signed off by a Thai licensed engineer (กว.).
- Building permits approved on Koh Samui.
Termites and rot
Steel is inorganic. Termites can't eat it and it doesn't rot, so the frame needs no chemical soil treatment.
Wind and storms
A steel frame is screwed and braced into one connected structure. Under wind load it flexes slightly and returns, where masonry can crack. Roof trusses are fixed to the walls and the walls to the slab, so the load has a continuous path to the ground.
Heat and comfort
A steel house is as cool as its insulation and roof. We build walls that let moisture escape outward: a breathable membrane outside, a ventilated gap behind the cladding, and insulation in the cavity. In an air-conditioned villa this keeps condensation off the steel and the rooms cool.
Faster on site
Because every piece arrives cut, numbered and pre-punched, there is no measuring or cutting on site. Walls and trusses for a villa stand in days. On one project, two semi-detached villas totalling 405 m² reached structure and roof in 15 days.
Lighter on the island
Recyclable
Steel is reused indefinitely at end of life.
Trees cut
No timber in the structural frame.
Site waste
Studs are cut to length in the factory, not on your land.
Termite spray
Inorganic frame, no toxic soil pre-treatment.
Frequently asked questions
Is light gauge steel strong enough for a two-storey villa?
Yes. LGS is routinely used for two- and three-storey homes. Each frame is engineered for its loads before fabrication.
Will a steel frame rust near the beach?
The ZM275 coating is designed for coastal sites, and the frame is enclosed inside the wall. Beachfront villas are part of what we build.
Can I hang a TV or kitchen cabinets on the walls?
Yes. We add backing inside the wall where heavy items go. Tell us early and it's in the drawings.
Does a steel house get hot?
Not with the right wall and roof. Insulation and ventilation decide comfort, not the frame.
Can I get a building permit for an LGS house on Koh Samui?
Yes. Our projects go through the normal permit process with a Thai licensed engineer's sign-off.
Can my architect's design be built in steel?
Usually, yes. Send us the plans and we'll confirm within 6 hours.