For added confidence, we seek further assurance that what we report is accurate. These internal systems, processes, and external bodies ensure that our reporting is credible.

Internal Assurance

Monitoring performance against sustainability criteria can be complicated. We use a number of processes internally to make sure we are accurate in our reporting.

External assurance

We work with a number of external companies to ensure we meet the highest standards, to provide challenges, and to ensure that our systems, processes and reporting are robust.

Bureau Veritas

Our sustainability data is audited annually by Bureau Veritas. This audit includes a statement of verification which covers the materiality and quality of data reported.

Willmott Dixon Holdings' Independent Assurance Report for the period 1 January 2024 to 31 December 2024 is published here.

BSI Standards


Willmott Dixon has the following ISO certified management systems:

  • Building Information Modelling Kitemark ISO 19650
  • Environment ISO 14001
  • Occupational Health and Safety ISO 45001
  • Information security ISO 27001.
  • Quality ISO 45001.