The first version of the Great British Insulation Scheme (GBIS) Measures Table was published on 7 August 2023, according to Ofgem's summary of updates to its supplier delivery guidance and measures table1. The table sits alongside the scheme's delivery guidance, which sets out Ofgem's procedures for administering the Great British Insulation Scheme, described in that guidance as a new scheme established by the Electricity and Gas (Energy Company Obligation) Order 2023, referred to as the ECO4A Order1.
The ECO4A Order was made on 24 July 2023, and parts 1 to 9 of the legislation relating to the scheme came into force the following day, 25 July 20231. Ofgem's summary records that its draft delivery guidance V0.1 was published on 30 May 2023, that delivery guidance V1.0 was published on 1 September 2023, and that the measures table V2.0 followed on 5 April 20241. Ofgem states of the later version that "There are no significant policy changes within this version"1.
The summary sets out how the scheme treats work done before the legislation took effect. It states:
"All measures delivered on or after 30 March 2023 until 24 July 2023 will be known as early delivery measures."
On eligibility, the guidance records that up to 16 percentage points of the 20 per cent low-income minimum requirement can be met through Flex1. It also states that a measure must be installed by a TrustMark registered installer and a certificate of lodgement issued, or must be installed subject to similar arrangements1. On cavity wall insulation, the guidance says CWI should not be installed to walls which already meet current building standards1. The summary also notes that the section on eligibility now includes information about Energy Saving Trust data matching in addition to Department for Work and Pensions data matching1.
| Document | Version | Publication date |
|---|---|---|
| Draft delivery guidance | V0.1 | 30 May 2023 |
| Measures table | V1.0 | 7 August 2023 |
| Delivery guidance | V1.0 | 1 September 2023 |
| Measures table | V2.0 | 5 April 2024 |
Why it matters for households
The measures table is the list that determines which insulation measures can be delivered under the Great British Insulation Scheme, so its first publication marked the point at which the scheme's measure set existed in written form. For a household, the practical questions are whether a property qualifies and which measures apply, both of which sit under GBIS eligibility. The scheme runs alongside the older ECO4 obligation, and the differences between them are set out in GBIS vs ECO4. The rules on cavity wall insulation matter for homes with walls that already meet current building standards, since the guidance states CWI should not be installed in those cases1. The requirement for TrustMark registered installers and a lodgement certificate is a condition attached to the measure, not a household choice1. The summary does not report how many households have received measures, what the measures cost, or what savings individual homes have seen.
What happens next
The summary records that Ofgem was working on creating a process to allow manual notification to take place before 31 January 2024 should the register not be available to accept notifications1. It also records that the measures table V2.0 was published on 5 April 20241. No further steps are set out in the summary.