ECO guidance and associated documents

Here you can access guidance and publications on the ECO scheme.

What our guidance does

It outlines:

  • how we determine which suppliers are obligated
  • how obligated suppliers can meet their obligations
  • when and what suppliers need to report on, and
  • information on ECO measures.

The ECO3 scheme commenced on 3 December 2018 and runs until 31 March 2022. The documents below apply to all measures installed on or after 1 October.

You can find guidance on delivering ECO measures amidst COVID-19 on our ECO Amidst COVID-19 page.

What it doesn’t do

It’s not intended as a definitive guide to the ECO3 Order.

Previous ECO schemes

Any measures installed between 1 April 2017 and 30 September 2018, should comply with our ECO2t guidance and associated documents.

Any measures installed between 1 April 2015 and 31 March 2017, should comply with our ECO2 guidance and associated documents.

If you’re unable to find the document you are looking for, contact the ECO team who will be happy to help.

ECO3 Key Scheme Resources (From 1 October 2018)


Date Published

Energy Company Obligation 2018-22 (ECO3) Guidance: Supplier Administration

31 October 2018

Energy Company Obligation 2018-22 (ECO3) Guidance: Delivery

15 November 2018

Energy Company Obligation (ECO3) Guidance: Innovation 5 February 2019



Date Published

ECO3 Pre-existing Loft Insulation Declaration

27 September 2018

ECO3 Social housing E, F and G declaration & landlord permission

28 September 2018

ECO3 Private housing FTCH declaration & private rented sector landlord permission

28 September 2018

ECO3 Boiler Assessment Checklist

02 October 2018

ECO3 Electric Storage Heater Checklist

02 October 2018

ECO3 Privacy policy

10 October 2018

ECO3 Child Benefit self-declaration

16 October 2018

ECO3 Data Dictionary

19 October 2018

ECO3 Appropriate Guarantees

14 November 2018

ECO3 Measures Table

15 November 2018

ECO3 Deemed Scores Matrix

30 November 2018

ECO3 Notification Template

3 December 2018

ECO3 Templates to evidence private domestic premises

3 December 2018

ECO3 Monitoring

25 January 2019

ECO3 Notice of receipt of an application for extension

31 January 2019

ECO3 Address formatting guidance note

31 January 2019

ECO3 Notifying a supplier of a decision to refuse or revoke approval of a measure

31 January 2019

ECO3 Alternative methodologies

31 January 2019

ECO3 District Heating Pre-Conditions (Insulation): Technical Report Template

28 March 2019

ECO3 District heating systems (DHS) factsheet and summary of proposal (SoP)

29 March 2019

ECO3 Toolkit

15 May 2019

ECO3 First Time Central Heating Checklist

16 October 2020

Publications and updates

  • Published: 26th May 2021
  • Guidance
  • 0 Associated documents
The ECO Newsletter communicates key policy news and updates from the last month. The updates provided will help provide additional guidance for suppliers deliver to their obligations successfully. This page contains an archive of the latest ECO news to...

  • Published: 16th Oct 2020
  • Guidance
  • 1 Associated documents
This First Time Central Heating (FTCH) Checklist (‘the FTCH checklist’) is designed to assess whether the replacement central heating system would qualify under the scheme as first time central heating.

  • Published: 6th Oct 2020
  • Guidance
  • 1 Associated documents
The checklist provides details of the essential documentation required to enable Ofgem to process a Subject Access Request made by a Solicitor or Claims Company.

  • Published: 7th May 2020
  • Guidance
  • 1 Associated documents
We have compiled guidance for industry that adds to the latest Government advice on tradespeople and work carried out in people’s homes, in the context of ECO. This is accurate as at 12 January 2021.

  • Published: 20th Jan 2020
  • Guidance
  • 0 Associated documents
This report template relates to technical reasons for not meeting the cavity wall insulation pre-condition. This technical report template can be used to evidence instances where there are technical reasons why a cavity cannot be filled.

  • Published: 18th Dec 2019
  • Decisions
  • 2 Associated documents
This document is our response to Ofgem's ECO3 improving consumer protection consultation.

  • Published: 5th Nov 2019
  • Closed: 3rd Dec 2019
  • Consultations and responses
  • 9 Associated documents
We are consulting on some of the administrative changes required in order to deliver our functions under the ECO3.1 Order.

  • Published: 13th Sep 2019
  • Guidance
  • 0 Associated documents
This document explains how Ofgem will collect, use, and protect personal information that it obtains under the Energy Company Obligation (ECO) scheme.

  • Published: 6th Aug 2019
  • Open letters and correspondence
  • 1 Associated documents
This document comprises Ofgem’s response to the ECO3 Improving consumer protection consultation.

  • Published: 15th May 2019
  • Guidance
  • 1 Associated documents
The ECO3 Toolkit is aimed at improving understanding of the scheme amongst installers and other third parties involved in the delivery of ECO3 measures.