A GBIS costs notice was published on 2 March 2026, according to the update log on the government's Great British Insulation Scheme collection page1. The entry sits between the February 2026 statistical release, published on 19 February 2026, and the March 2026 release, published on 26 March 20261. The collection page records the notice as "GBIS costs notice published"1. No further detail on the notice's contents appears on that page, and the figures it contains have not been reported there.
The collection holds data "to monitor the installation of energy efficiency measures in domestic properties via the Great British Insulation Scheme (GBIS)"1. Releases are monthly, and the tables "provide analysis on the measures installed and households receiving measures", with analysis "by measure type and geography"1. The scheme covers Great Britain, and the statistics run from the scheme's launch at the end of March 20231. The data included are two months in arrears, and the statistics "are provisional and are subject to future revisions"1.
A separate update on 2 April 2026 set out a proposed change to the release schedule1. Because the release reports installations two months in arrears, "final figures up to the end of the scheme were published in the May 2026 publication"1. The department proposed ending the monthly updates in favour of a single further publication in autumn 2026 to account for final data revisions, and asked for user feedback1.
"we propose ceasing the monthly updates and have just one further publication in autumn 2026 to account for any final data revisions."
The June 2026 release, published on 25 June 2026, carries a note that "the Ofgem data featured in the June 2026 release continues to be provisional and subject to revision pending ongoing processing and validation of measures by Ofgem"1. Historical releases are available on request1.
Why it matters for households
The costs notice concerns the published figures for the scheme rather than any change to what a household can apply for. For a household weighing up insulation through GBIS, the practical point is the state of the data: the numbers are two months behind, provisional, and open to revision1. Anyone checking whether measures in their area have been delivered, or how the scheme is performing, is reading figures that may later change.
The scheme's own eligibility rules and how it compares with other support are set out separately. Households commonly ask how GBIS eligibility works, how the scheme sits against ECO4, and how it compares with the Warm Homes: Local Grant. A related question for anyone also considering a heat pump is whether a Boiler Upgrade Scheme grant is affected by an EPC that recommends loft insulation.
What happens next
The department proposed one further statistical publication in autumn 2026, covering any final data revisions, in place of monthly updates1. Future publication dates are to be published on gov.uk in advance1. Feedback on the proposed change was invited at energyefficiency.stats@energysecurity.gov.uk1. The outcome of that consultation has not been reported on the collection page.