If you’re new to the Esos Register and want to know more about our services, you’re in the right place.


The Energy Savings Opportunity Scheme (ESOS) is a mandatory energy assessment scheme for organisations in the UK who meet the eligibility criteria. Organisations that qualify for ESOS must undertake an ESOS assessment every four years.

An ESOS assessment is an audit of the energy used by the organisation through their buildings, industrial processes and transport and is used to identify energy saving measures that the organisation can implement in order to reduce their energy costs and usage.

An ESOS Lead Assessor is an individual who is qualified to carry out the energy audit part of an ESOS assessment and provide energy saving recommendations tailored to the organisation in question.

There are several eligibility criteria required in order for an individual to qualify as an ESOS Lead Assessor. This includes holding at least one of the following qualifications:

  • Non-Domestic Energy Assessor Level 3, 4, 5
  • Public Buildings Energy Assessor Level 3
  • Air Conditioning Energy Assessor Level 3 or 4
  • ISO 500001 Lead Auditor
  • Non-Domestic Green Deal Advisor L4
  • Low Carbon Consultant

 In addition, an ESOS Lead Assessor qualification will need to have been obtained. Our team are happy to help advise you if you are not sure if you meet these criteria so please get in touch with any questions.

No, we do not currently offer any Lead Assessor training.

For the first year of registration, the annual cost is £495+VAT, this includes the application fee.

Registration is for an annual basis and requires renewal every 12 months.

If you are already one of our registered Lead Assessors then our team will contact you directly to outline the renewal process when your renewal is approaching. You do not need to take any action before this.

Yes, we welcome Lead Assessors who trained with other training providers. We require the ESOS training course you completed to have been 2 days long in duration as a minimum for you to join our register but please contact us if you have any questions.

No, technical support is provided by the dedicated ESOS team at the Environment Agency, please contact them directly for assistance at esos@environment-agency.gov.uk

Please contact our friendly team on either 01225 667 570 or at info@esosregister.com – they will very happy to help and provide guidance.

Contact Us

Do you need some clarity on some of our products and services or are you looking to become a lead assessor either way we would love to help?

Fill in the contact form or call us on 01225 667570 (Option 1)

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