Skip to content

CIBSE is currently upgrading its IT systems to improve core customer functions and increase efficiency and effectiveness. This will mean some website services will be offline until Monday 25 July. Help


How to become a CIBSE ESOS Lead Assessor
Find a CIBSE ESOS Lead Assessor


CIBSE Certification Ltd is one of the first to be approved by the Environment Agency to operate a register of Energy Savings Opportunity Scheme (ESOS) Lead Assessors and already has trained professionals certified as competent to carry our assessments for qualifying organisations.

How to become a CIBSE ESOS Lead Assessor

The ESOS regulations require that the ESOS Lead Assessors be sourced from approved existing schemes run by professional bodies, such as the CIBSE Low Carbon Consultants register.

Yet to become a CIBSE Low Carbon Consultant

Those looking to become a CIBSE ESOS Lead Assessor - that are yet to become a CIBSE Low Carbon Consultant (LCC) - will need to visit the CIBSE Energy Centre website for details on how to become an LCC.

Already a CIBSE Low Carbon Consultant

1. Complete an ESOS Lead Assessor training course. For course dates go to the ESOS Training page.

‚Äč2. Ensure that all your maintenance requirements are up to date including insurance details, Code of Conduct Rev 8 signed and that your Part L 2013 update assessment has been undertaken.

3. Download the ESOS Lead Assessor Application and return the completed application to

Find a CIBSE ESOS Lead Assesor

CIBSE Certification has a register of ESOS Lead Assessors. CIBSE's major focus is on the energy performance of buildings, making us a clear choice of most of an organisation's energy use is in buildings. CIBSE can also provide assessors with experience in other sectors, processes and transport, which means they will find a suitable ESOS Lead Assessor whatever their energy mix. 

Organisations can be confident using CIBSE registered ESOS Lead Assessors, who will need to have demonstrated at least two, and typically more than four years, relevant experience in addition to the qualifications they hold, and are also trained to provide high quality information.

Useful links

Find a CIBSE ESOS Lead Assessor
ESOS Training courses
The complete ESOS Regulations 2014
How to become a CIBSE Low Carbon Consultant 
ESOS presentation from DECC