Great British Insulation Scheme Delivery Guidance

The Great British Insulation Scheme is a government energy efficiency scheme for Great Britain. It is an addition to the current ECO scheme and aims to deliver rapid installation of energy efficiency measures to a wider pool of households in the least efficient homes.

The Department for Energy Security and Net Zero has named Ofgem as the administrator of the Great British Insulation Scheme.

Our guidance documents provide information on the legislative requirements of the ECO4A Order and our administrative processes. Parts 1 to 9 of the ECO4A Order commenced on 25 July 2023, the Order will run until 31 March 2026. 

We have split the Great British Insulation Scheme Guidance into six parts:

1. The Great British Insulation Scheme Supplier Administration Guidance
2. The Great British Insulation Scheme Supplier Delivery Guidance
3. The Great British Insulation Scheme Data Dictionary
4. The Great British Insulation Scheme forms and tables
5. The Great British Insulation Scheme and ECO4 Local Authority Administration Guidance
6. The Great British Insulation Scheme and ECO4 LA and Supplier Flex Forms and Subsidiary 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 Great British Insulation Scheme targets.

The Delivery guidance addresses the following:

• How a supplier achieves its obligation
• Specific requirements relating to eligibility of households
• Measures eligible under the Great British Insulation Scheme and the criteria that must be met
• How Great British Insulation Scheme savings are determined, including information on scoring
• How measures are notified and the information we require
• The quality assurance that suppliers must meet
• Our expectation of suppliers in relation to audit and counter-fraud activity
• Supporting information contained in appendices.

We have published an accompanying document to the Great British Insulation Scheme Delivery Guidance V1.0 that details the changes made between the Draft Great British Insulation Scheme Delivery Guidance V0.1 and the final V1.0.