ESOS Lead Assessors

CIBSE Certification is an approved ESOS Lead Assessor register under the Environment Agency scheme.

Apply now

CIBSE Certification's schemes are for competent personnel who provide robust, impartial knowledge and guidance in the design and operation of energy efficient buildings, and management systems.

All schemes conform to the requirements of  ISO 17024:2012 and registrants must comply with competency requirements, our code of conduct, maintain appropriate insurance and meet our CPD requirements.

Join the CIBSE Certification register of industry respected professionals as an ESOS Lead Assessor.

What is ESOS?

The Energy Savings Opportunity Scheme (ESOS) is a mandatory energy assessment and energy saving identification scheme for large undertakings (and their corporate groups). The scheme is applicable throughout the UK. 

What is an ESOS Lead Assessor? 

In 2015 CIBSE Certification were approved to operate an ESOS Lead Assessor register in support of the ESOS Regulations. ESOS reports identifying the total energy use and energy savings opportunities for large organisations must be signed off by a registered ESOS Lead Assessor.  You need to be an LCC to become an ESOS Lead Assessor. 

The ESOS regulations require that ESOS Lead Assessors be sourced from approved existing schemes run by professional bodies, such as the CIBSE Certification Low Carbon Consultants register. Therefore CIBSE Certification ESOS Lead Assessor applicants are required to be registered as a CIBSE Certification Low Carbon Consultant.

The ESOS Lead Assessor certification scheme is open to anyone that can meet the entry requirements of competence, a minimum of two years of professional energy assessment and energy audit experience relevant to PAS 51215.

Why Become a certified ESOS Lead Assessor?

  • Be listed on the official CIBSE Certification ESOS Register
  • Demonstrate your technical competence and understanding of energy assessment
  • Open new consultancy opportunities under ESOS Phase 3 and future phases
  • Access updates, technical guidance and audit tools
  • Benefit from the support of a UKAS-accredited certification body

How to Apply

Stage 1. Register as a CIBSE Certification Low Carbon Consultant (LCC) if not yet registered.

Choose which LCC strand you wish to join and pass the relevant LCC assessment.  There are no formal entry requirements, but it is advised that candidates familiarise themselves with the level of knowledge and experience (at least two years) expected beforehand and take appropriate training if required.

Visit CIBSE Training for more details and a list of upcoming LCC course dates.

Once you have passed the LCC exam, complete the LCC application process. 
 

Stage 2. Register as a CIBSE Certification ESOS Lead Assessor

Successfully complete an ESOS Lead Assessor training course and exam.  Visit www.cibse.org/esos-training for more details and a list of upcoming training dates.

  1. Once you have passed the exam, download the ESOS application pack →
  2. Complete the application form ensuring you and your referee have signed the form
  3. List your area(s) of specialisms on the application form
  4. Submit a copy of your employer's Professional Indemnity Insurance (PII) document. We cannot specify the limit of indemnity but we do recommend a minimum of £100,000.
  5. Submit a CV detailing your experience in energy improvement related work
  6. Pay the application fees on submission of your application
  7. Once the application has been approved pay the registration fees →

Need Help?

If you have questions about becoming an ESOS Lead Assessor, contact our Certification team:
epc@cibsecertification.org
020 8772 3649

BEIS have published their consultation response regarding changes to ESOS for Phase 3 & 4. These changes are set out below.

Regulations for the Phase 3 changes are intended to be brought into force ahead of the 5 December 2023 compliance deadline. BEIS and the Environment Agency will work with Professional Bodies, assessors and participants as they move towards this.

These changes are set out in the response to questions 2, 3, 8, 15, 20 and 21 in the Government Response and relate to:

  • A standardised template for including compliance information in the ESOS report, generally comprising ESOS information the participant should already have available
  • The reduction of the 10% de minimise exemption to up to 5%
  • The addition of an energy intensity metric in ESOS reports
  • Requirement to share ESOS reports with subsidiaries
  • Requirement for ESOS reports to provide more information on next steps for implementing recommendations
  • Requirement for participants to set a target or action plan following the Phase 3 compliance deadline, on which they will be required to report against for Phase 4
  • Collection of additional data for compliance monitoring and enforcement

It should be noted that implementation of these requirements is subject to the Parliamentary timetable and scrutiny of the necessary primary and secondary legislation.

The remainder of the changes set out in the government response will be introduced in Phase 4, including the new requirements for net zero which will be based on the ESOS PAS currently under development.

The following Environment Agency Publications are available to download here:

ESOS Assessment Standards Table

Complying with the Energy Savings Opportunity Scheme

ESOS Compliance Audit Need to Know Guide