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Marshalls plc

ISO 50001 energy management system certification

Marshalls is the largest hard landscaping manufacturer in the UK, supplying natural stone and concrete products to the construction, landscape and home improvement markets. The group has over 2,000 employees working across quarries and manufacturing sites throughout the UK.

A constituent of the FTSE 250 index, Marshalls aims to consistently demonstrate its four core corporate values of Leadership, Excellence, Trust and Sustainability. In line with these values and because the business is a major energy user, Marshalls wanted credible third-party assurance to show that it was following best practice in its energy management.

Marshalls decided to work with the Carbon Trust’s independent assurance arm to seek certification to ISO 50001, the international standard for energy management systems. By achieving this certification the company could then demonstrate that it has implemented an internal control approach that meets global best practice, helping to continuously improve energy efficiency and cut costs.

Marshalls was the first company to be audited by the Carbon Trust for ISO 50001 certification, used as an best practice example to secure accreditation from the United Kingdom Accreditation Service (UKAS) for certifying to the standard. In order to achieve certification to ISO 50001 Marshalls had to undergo a rigorous two stage audit process to ensure that it had successfully implemented a Plan-Do-Check-Act (PDCA) continual improvement framework for energy management. This requires a number of steps to have been taken, including:

  • Plan: conducting an energy review and establishing baseline use, then putting in place energy performance indicators, objectives, targets and action plans;
  • Do: effectively implementing energy management action plans;
  • Check: monitoring and measuring processes and operations that affect energy performance, in line with the company’s energy policy and objectives; and 
  • Act: taking action to continually improve energy performance and the existing energy management system itself.


Stage 1 of the Carbon Trust’s audit was conducted in late 2016, which was used to gain an understanding of the energy management system implemented by Marshalls, ensuring it was in line with the requirements of ISO 50001 and identify any potential areas of concern. 

This was followed by a Stage 2 audit in early 2017 which subsequently tested the system was indeed proving to be effective and leading to continual improvement in energy performance.

Following these two audits the Carbon Trust was then able to award ISO 50001 certification to Marshalls for three years, as the company demonstrated conformity with all the requirements of the standard and was adhering to best practice. To retain ISO 50001 Marshalls needs to undergo annual surveillance audits, before needing to fully recertify at the end of the certification period.

The Carbon Trust is accredited by the United Kingdom Accreditation Service (UKAS) to deliver certifications to ISO 50001 and is a member of the Clean Energy Ministerial’s Energy Management Campaign to internationally promote ISO 50001 implementation.

At Marshalls we challenge ourselves to be the best, so it made a lot of sense to work with the Carbon Trust on ISO 50001 certification and ask internationally-recognised experts in energy management to audit our own system, making sure it is fully in line with the very best practice. We have also held the Carbon Trust Standard for almost a decade, providing assurance of our ongoing success in reducing our carbon footprint, so we appreciated the fact we could go through this certification process at the same time reducing the total costs and resource requirements.

David Morrell, Group Head of Sustainability & Intellectual Property, Marshalls plc

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