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How to Choose Between ESOS Assessors

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how to choose between esos assessors

The Energy Saving Opportunity Scheme (ESOS) is mandatory for organisations with over 250 employees. If that includes your business, you’ll need an ESOS-approved assessor to carry out your obligations.

While they can be appointed internally, many businesses contract an external ESOS assessor to make things easier. When you do so, you’ll find a range of candidates competing for your business. In this post, we’ll outline how to choose between different ESOS assessors…


Above all else, ESOS assessors need to be approved. Put simply, this means they’ll need to be listed on the relevant register of an approved professional body. Here are the bodies with approved registers:

  • Association of Energy Engineers
  • The Chartered Institution of Building Services Engineers
  • Elmhurst Energy Systems
  • Energy Institute
  • Energy Managers Association
  • Institution of Chemical Engineers
  • Institute of Environmental Management and Assessment
  • Institution of Environmental Sciences
  • Quidos
  • Stroma Certification Ltd


When advising on the approved registers listed above, explains, “It is your responsibility to select a lead assessor with the necessary skills and experience to help your business comply with ESOS.”

In other words, approval is just one of the boxes they need to tick. It shows that they’ve met the conditions of a particular register or professional body, but it doesn’t necessarily mean they’ll do a great job.

To go one step further, look for other qualifications and accreditations held by the company in question. NICEIC is a hallmark for electrical competency, technical ability and best practice, while the likes of SafeContractor ensure companies operate safely on their clients’ premises.


As well as qualifications, it’s worth checking how long different ESOS assessors have been around. Firstly, having plenty of industry experience shows that they’ve put their skills and knowledge into practice, and mastered their craft over the years.

On top of that, experience as a lead assessor means they’ll know the ins and outs of ESOS obligations and be familiar with the process.


There are a number of basic obligations for ESOS like calculating consumption and notifying the Environment Agency. But to really make the most of it, you want a lead assessor that’s committed to optimising your energy use and saving you money.

Find out what kind of service is on offer from different lead assessors and look for one that goes above and beyond.


Many companies will say they’re experienced and committed to delighting customers. But how do you know? That’s where reviews come in.

Find as many reviews and customer testimonials as you can on sites like Trustpilot, Yell and Facebook. This will give you an insight into the work they do for businesses just like yours.

Have a chat!

The final acid test for ESOS assessors? A good, old-fashioned chat. What better way to get a feel for many of the criteria above – from experience and expertise to the way a company treats its customers?

At Volta Compliance, we’re always happy to speak to potential customers about their ESOS requirements. You can call us on 0113 397 1361 or email [email protected] and we’ll get back to you as soon as we can.

As experienced ESOS assessors, we’ve helped countless Yorkshire businesses fulfil their ESOS obligations, reduce their energy output and save both time and money. We look forward to hearing from you!

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Richard Carr Volta Compliance
Richard Carr
Managing Director
Richard is the Director of Volta Compliance. He is a fully qualified approved electrician graded with the JIB. Richard has over 20 years electrical experience working on commercial and industrial installations.