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: 6th Jul 2016
  • Guidance
  • 3 Associated documents
This document lists the guarantees that Ofgem has reviewed and consider to meet the criteria for an appropriate guarantee under the Energy Company Obligation (ECO).

  • Published: 24th Jun 2016
  • Guidance
  • 1 Associated documents
Notice on the ECO2 retrospective U-value audit.

  • Published: 7th Jun 2016
  • Guidance
  • 0 Associated documents
View the ECO appropriate methodologies for the scheme administered by E-Serve.

  • Published: 8th Feb 2016
  • Closed: 7th Mar 2016
  • Consultations and responses, Decisions
  • 38 Associated documents
This consultation sought views on proposals relating to the process of overwriting default U-values for cavity wall insulation (CWI) measures under the ECO2 scheme.

  • Published: 4th Feb 2016
  • Decisions
  • 1 Associated documents
We have now published our response document which summarises the stakeholder’s submissions to our ECO2 Technical Requirements Consultation.

  • Published: 1st Dec 2015
  • Guidance
  • 1 Associated documents
Information on notifying, monitoring and calculating savings for loft insulation measures where pre-existing insulation has recently been removed.

  • Published: 1st Dec 2015
  • Guidance
  • 2 Associated documents
The administration guidance is aimed mainly at suppliers, describing the processes that suppliers and Ofgem follow to meet the requirements of the ECO2 Order.

  • Published: 1st Dec 2015
  • Guidance
  • 2 Associated documents
The delivery guidance is aimed at suppliers and the broader supply chain, describing how to deliver measures that are eligible to contribute towards the ECO targets.

  • Published: 19th Nov 2015
  • Guidance
  • 5 Associated documents
Guidance for suppliers on technical and score monitoring for measures installed under ECO2.

  • Published: 19th Oct 2015
  • Guidance
  • 1 Associated documents
Ofgem's ECO Toolkit for installers and other third parties involved in delivering ECO measures. This suite of resources aims to improve understanding of how an ECO measure is processed.