[Skip to content]

TWI Certification Ltd
Factory Production Control
Conformity Assessment of the Execution of Steel and Aluminium Structures (CAESAS)

Conformity Assessment of the Execution of Steel and Aluminium Structures (CAESAS)

The conformity assessment of the structural steel construction products is harmonised with Regulation (EU) No 305/2011 by the UK Statutory Instrument (SI) 2020 No. 1359.


TWI Certification Ltd is an Approved Body operating under the Statutory Instrument (SI) No. 1359.

BS EN 1090-1 is the harmonised supporting standard that sets the requirements for conformity assessment of steel and aluminium structures (CAESAS).

For a manufacturer to be able to export their structural products to the European market and affix a CE Mark, WI CL has partnered up with AAA Certification AB (A3CERT) Sweden. For all UK manufacture of structural products a UKCA mark will be required. Conformity assessment of Factory Production Control (FPC) by TWI CL will enable UK manufacturers to affix a UKCA, CE (UKNI), or CE Mark, for the market you are placing your products on. 

TWI CL is an Approved Body for the SI (AB 2400) and performs assessment and certification of manufacturers in accordance with EN 1090-1 using its CAESAS Scheme.

FPC certification under CAESAS is supplemental to or inclusive of assessment and certification in accordance with ISO 3834 - Quality requirements for fusion welding of metallic materials.

TWI CL is the only Certification Body able to provide the internationally recognised EWF and IIW Manufacturer Certification Scheme certificates in the UK.

Partnership formed between TWI Certification Ltd and AAA Certification AB (A3CERT) for EN 1090 FPC Certification.

TWI CL & A3CERT EN 1090 Logos.png