Become a CIBSE Certification ESOS Lead Assessor

What is ESOS? - Read updates and news about the scheme.

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 two application steps are:

1. Yet to become a CIBSE Certification Low Carbon Consultant (LCC)

Candidates are required to:

Pass an LCC assessment for which 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.

Visit for more details and a list of upcoming LCC training dates.

Once the exam is passed, complete the LCC application process

Complete step 2 below:

2. Already a CIBSE Certification Low Carbon Consultant (LCC)

Complete an ESOS Lead Assessor training course.  Visit for more details and a list of upcoming training dates.

Ensure all maintenance requirements are up to date including insurance details, a signed current Certification Code of Conduct and that you have undertaken a Part L 2013 assessment.

Download the ESOS Lead Assessor Application Pack.