• FAQs
  • Jobs
  • Shop
  • News
  • Contact
  • Register
  • My IEMA
logo
  • About
    • Our organisation

      • About us
      • What we do
      • Governance
      • Meet the team
      • IEMA at 25 Years
      • Future purpose of IEMA
      • Collaborations
      • Green Careers Hub
      • Current Vacancies
    • Our commitments

      • Climate emergency
      • Sustainability policy
      • IEMA's carbon footprint
      • Equality, diversity and inclusion
      • Diverse Sustainability Initiative
      • Green Skills at COP
    • News and shop

      • News
      • Publication shop
      • IEMA in the media
  • Profession
    • Policy, Practice & Public Affairs

      • Overview
      • Public affairs
      • Biodiversity and natural capital
      • Circular economy
      • Climate change mitigation & adaptation
      • Environmental management
      • Impact assessment
      • Social sustainability
      • Sustainable finance
    • Standards & Chartership

      • Sustainability skills map and membership standards
      • Sustainability competencies
      • Path to Chartership
      • State of the profession
      • Upgrade your membership
      • IEMA Code of Professional Conduct
      • Continued professional development at IEMA
    • Careers

      • IEMA jobs board
      • Green skills and careers
  • Join
    • Individual membership

      • Membership Grades
      • Membership Fees
      • Join a Specialist Register
      • Reinstate your membership
      • Upgrade your membership
      • Sustainability skills map and membership standards
      • IEMA Code of Professional Conduct
    • Corporate partnerships

      • Corporate partnerships overview
      • Corporate partnership benefits
      • EIA Quality Mark
      • Professional development schemes
    • Educational partnerships

      • Become a training partner
      • Become a university partner
  • Learn
    • Courses

      • Upcoming training courses
      • Course information
      • Training partner register
      • Approved university courses
      • Apprenticeships and membership
    • Videos and publications

      • Day in the life
      • How To
      • How to become a Practitioner
      • Policy and practice resources
      • Sustainable Matters podcast
      • Transform
      • Watch again - video library
      • Navigate Environment
    • Sustainability skills

      • All jobs greener
      • Sustainability skills map
      • Skills for the workplace
      • Sustainability competencies
      • Transition to net zero
      • Green Careers Hub
  • Engage
    • Blogs, events and webinars

      • Blogs
      • IEMA Connect
      • Upcoming events and webinars
      • Watch again - video library
      • Affinity partnerships - exclusive offers for IEMA members
    • Communities

      • UK Regional Networks
      • World Regional Networks
      • IEMA Futures Network
      • IEMA Fellows Network
      • Policy and Practice Networks
      • Specialist Registers
      • Specialist in Land Condition Register
      • Diverse Sustainability Initiative
      • Green Careers Hub
    • Transform

      • Home
      • News and features
      • Archive
  • FAQs
  • Jobs
  • Shop
  • News
  • Contact
  • Register
  • My IEMA

ESOS Lead Assessors

Benefits of registration

Organisations who are required to comply with ESOS can appoint a Lead Assessor who is a member of an approved professional body register to conduct an ESOS assessment as a way of complying. The IEMA ESOS Lead Assessors register enables individuals to demonstrate professional competence in energy assessments to their organisation, clients and colleagues. For wider information on ESOS, you can visit the Government’s ESOS webpage here: Energy Savings Opportunity Scheme (ESOS) - GOV.UK (gov.uk)

View IEMA's public Register

Eligibility

To be eligible to apply for IEMA’s ESOS Lead Assessor Register, members need to be at least ONE of the following:

  • a Principal Environmental Auditor;
  • a Full member of IEMA and an Environmental Auditor (EA).

Along with the above, members will also need to demonstrate the following:

  • a minimum length of two years' professional energy assessment and energy audit experience relevant to PAS 51215:2014, e.g. in energy management, energy auditing, energy management systems
  • involvement with two or more energy efficiency assessments/audits (either as an assessment team member or as the lead assessor)
  • show evidence of leading audits/assessments for large organisations

Application process

Applications to the ESOS Lead Assessor register are assessed by an External Panel using the competencies in PAS 51215:2014 and evidenced through relevant training and experience and membership of professional bodies, external verification checks (see below) and successful completion of a one-day training workshop. The timeframe for approval under our external panel assessment process can vary; however, it will usually take around three weeks. Please note that candidates can only re-apply for ESOS Lead Assessor status twice within any 12-month period.

External verification checks

For each application received, IEMA contacts the verification sources provided (minimum of three) to check that the work as described was undertaken, for the stated length of time and was of an acceptable standard. IEMA is not interested in the findings of audits or any confidential information.

Training workshop

This one-day workshop is a mandatory part of the application process to join IEMA’s Lead Assessor Register. It is also available to attend as a stand-alone workshop if you can demonstrate that you have the correct level of knowledge and experience and that you are actively working towards meeting IEMA’s membership eligibility criteria to become an ESOS Lead Assessor:

  • The training day will only count towards an application to join IEMA’s Lead Assessor Register in conjunction with a successful application and assessment.
  • All attendees are expected to have a background in energy management methods and demonstrate they have the experience set out under Eligibility. The course is not appropriate to new entrants.
  • Attendees will be required to complete pre-course reading, prepare a case study and complete a self-assessment against the technical and non-technical knowledge and skills required of an ESOS assessment team before attending the course.

Please note that these workshops are run subject to demand. For more information about workshop dates and prices, please click here.

logo

Fenland House,
15B Hostmoor Avenue,
March,
Cambridgeshire,
PE15 0AX.

  • Call us:

    +44 (0)1522 540069
  • Email us:

    [email protected]
  • Privacy
  • Terms
  • Cookies
  • Accessibility
  • Make a Complaint

© Copyright The Institute of Sustainability and Environmental Professionals 2025

(formerly the Institute of Environmental Management and Assessment)

Company Limited by Guarantee. Registration Number: 03690916 Place of Registration: England and Wales Registered Office Address: Fenland House, 15 B Hostmoor Avenue, March, Cambridgeshire, PE15 0AX

  • logo
  • logo
  • logo
Inactivity Alert Just now
Your session will expire soon due to inactivity.
Session Expired Just now
You have been logged out. Click close to continue.