SMTS lorry in Witney Factory

System Certification


The Sigma® II Build System is already being used by clients to deliver a more sustainable, energy efficient way of building, safe in the knowledge of having a fully certified and approved system.

BBA Product Certification: Agrément Certificate 11/4873

  • Extensive testing programme completed, inc. fire, thermal and structural
  • Build system certification, suite of wall, floor and roof construction details and product sheets
  • Site and factory inspected annually

RD Acoustic Flanking Accreditation

  • Acoustic field testing successful
  • Stage 1 candidate assessment passed
  • RD certification expected following final site tests

Constructive Details Ltd: Thermal Modelling Accreditation

  • Pilot assessment completed
  • Typical Y-Value calculations modelled
  • Certification awaited subject to CLG sign-off of approved industry scheme

NHBC Warranty

  • Five pilot schemes successful and warranty issued to developer
  • Several site inspections completed
  • NHBC accepted

BLP Durability and Maintenance

  • 60 year assessment completed
  • High durability and virtually maintenance free

Lloyds Build Offsite, Property Assurance Scheme (Mortgage and Valuation)

  • Pilot site underway
  • Registered database for 2nd and 3rd valuations
  • RICS and CML backed
  • Funded and supported by Santander, Lloyds, RBS and Nationwide
  • Lloyds Banking Group, mortgage letter of comfort available