Light gauge steel framing systems
Light gauge MMC, or light gauge steel framing is a Modern Method of Construction. It is a factory-manufactured building system made from thin, cold-formed galvanised steel sections that are designed off-site and assembled on site as panels or volumetric units. “MMC” refers to the UK government’s classification of Modern Methods of Construction, particularly Category 2, which covers panelised systems manufactured off-site.
The “light gauge” element refers to the thickness of the steel sections, which are typically between about 0.9 mm and 2.4 mm thick. These sections are cold-formed rather than hot-rolled, giving them high strength-to-weight ratios while remaining relatively easy to handle and transport.
Light gauge steel MMC is most commonly used for the loadbearing structure of mid-rise buildings. It can form the primary structural frame, floors and internal walls, often combined with other systems such as concrete floor slabs, rainscreen cladding or brick slip façades. Because components are precision-engineered in a factory, tolerances are tight and site assembly is rapid compared to traditional masonry construction.
Light gauge MMC is often promoted for its speed, quality control and suitability for repeatable housing typologies, while also giving good cost certainty, supply-chain maturity and long-term adaptability when compared with both traditional construction and other MMC approaches such as cross-laminated timber or modular volumetric systems.
[edit] Related articles on Designing Buildings
- Braced frame.
- Concept structural design of buildings.
- Concrete frame.
- Concrete-steel composite structures.
- Girder.
- Guidance for construction quality management professionals: Structural Steelwork.
- Light steel frame.
- Portal frame.
- Off-site prefabrication of buildings: A guide to connection choices.
- Skeleton frame.
- Steel frame.
- Structural steelwork.
- Timber frame.
- Types of frame.
- Types of steel.
Featured articles and news
We're expanding our collaborative mission by launching DB Intelligence, an exclusive market research advisory panel. Built environment professionals can now get paid to share their expertise on industry trends, products and services.
Panel members receive direct financial incentives for participating in research projects like short surveys, 1-2-1 interviews and focus groups. Register today to shape the future of the construction sector.
Planning condition discharge in England and Wales
A brief exoplanation from a building compliance expert, with further links.
Overheating guidance and tools for building designers
Guidance for dealing with element of building fabric control that have increasing importance.
Shading for housing, a design guide
From the Good Homes Alliance and British Blind and Shutter Association.
UK Standard Skills Classification (SSC)
A shared framework for describing skills needs.
Social media ban consultation comes to close
CIOB urges UK Government to consider social media’s role in careers guidance in ban debate.
The latest of eight Skills England apprenticeship units
The addition of battery manufacturing welcomed by ECA with a warning about the risks of fast-tracked apprenticeship units.
Building Control Independent Panel final report
A precis of a key report led by Dame Hackitt with full recommendations and link to the government response.
Building Safety recap April, 2026
A short and longer run-through of the month, with links to further information and sources.
CIAT May 2026 briefing.
From medieval scribes to modern word art.
ECA welcomes crackdown on late payment and push for clean energy, whilst CIOB seek fixed cladding removal timeframes.
Cyber Security in the Built Environment
Protecting projects, data, and digital assets: A CIOB Academy TIS.
Managing competence in the built environment
ITFG publishes new industry guide on how to meet the ICC principles.
The UK's campaign to reduce noise pollution: Mythbusting, articles and topic guides.