SMTS lorry in Witney Factory

Offsite Construction


The Sigma® II Build System factory produced components guarantee that a high quality fabric can be simply and speedily assembled on site, with less waste and transportation, than conventional methods.

The build system also offers a range of offsite construction features, including:


  • Closed panel and fully insulated
  • Service cavity pre-fitted
  • Floor cassettes wrapped, air sealed and insulated
  • Built-in air tightness detailing and seals
  • Built-in air tightness detailing and seals
  • Safer build system
  • Principle service penetrations pre-formed
  • Potential to air test, immediately after kit erection
  • Optional factory fitting of windows
  • Optional insulated ground floor cassettes
  • Optional insulated ceiling cassettes
  • Optional insulated roof cassettes

  • The amount of site labour time has also been reduced through the integration of several trades/suppliers into one package, thus eliminating non value adding site processes, which attract hidden capital cost and downstream cost overruns.

    The simplicity of the system eases the burden of supervision and material requisition on site managers allowing them to focus on quality and safety.

    The Sigma® II Build System reduces many of the health and safety hazards on site and can be erected without the need for fall arrest systems and controlled manual lifts.