Summary of the Great British Insulation Scheme: December 2025
Published 18 December 2025
Applies to England, Scotland and Wales
© Crown copyright 2025
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Introduction
The Great British Insulation Scheme (GBIS) is a government scheme to help people insulate their homes, make them more energy efficient and save money on their energy bills.
The Government announced the scheme at the end of March 2023. The £1 billion scheme aims to help the least energy efficient households across the country with the cost of installing new home insulation. The GOV.UK referral service for the Great British Insulation Scheme (GBIS) has now closed. Closing the service prior to the end of the scheme allows energy suppliers sufficient time to process applications and complete installations before the scheme officially ends on 31 March 2026. People can still reach out to an obligated energy supplier or an installer to enquire about accessing the scheme for the remaining months.
What you need to know about these statistics
These statistics are based on data provided by Ofgem covering installations of measures since the start of the scheme at the end of March 2023 up to the end of October 2025. Data on associated costs to the end of September 2025 (Tables 9 and 10) are based on quarterly GBIS cost reports submitted by energy suppliers.
Data are based on the date of completed installation of measures as recorded in the Ofgem register.
All figures are provisional and subject to revision.
Key statistics
Delivery by month
Since the start of GBIS, there have been 113,900 measures installed in 85,900 households up to the end of October 2025.
There were 6,100 measures installed in 3,700 households during October 2025. This was an increase of 8% in measure delivery compared to September 2025. Monthly measure delivery has been between 5,000 and 6,100 measures so far in this financial year except for April 2025 (3,800 measures).
Average measure delivery per month in the last three months (August to October 2025) was 5,700.
Figure 1: Number of Measures Installed and Households Upgraded by Installation Month
The data used in Figure 1 can be found in Tables 1 and 2 of the Accompanying Tables.
GBIS targets two eligibility groups: a low-income group, similar to the Help to Heat Group in ECO4, and a general eligibility group. Within the low-income group, Local Authorities can identify and refer on to the scheme households that are low-income, fuel-poor or vulnerable to the effects of living in a cold home through a mechanism called Flexible eligibility. More information on these eligibilities can be found in the GBIS delivery guidance.
To the end of October 2025, around 58,600 (51%) of the measures installed under GBIS were delivered to households in the low-income eligibility group. Of these measures, around 9,300 were delivered under the Flexible Eligibility mechanism.
To the end of October 2025, around 31,600 (37%) of the households upgraded under GBIS were in the low-income eligibility group. Of those, around 3,600 were upgraded under the Flexible Eligibility mechanism.
Innovation measures are measures that can demonstrate an improvement over comparable measures currently deliverable under the scheme. To the end of October 2025, around 8,600 innovation measures were installed.
Delivery by measure type
The most common measure so far has been cavity wall insulation, accounting for 44,100 (39%) of the total 113,900 measures. This was followed by loft insulation which accounted for 31,700 measures (28%) and heating controls which accounted for 26,700 measures (23%).
Figure 2: Number of Measures Installed by Measure Type (April 2023 to October 2025)
The data used in Figure 2 can be found in Table 3 of the Accompanying Tables.
Following the ECO/GBIS mid-scheme changes, households have been able to receive two or more primary measures under GBIS in certain circumstances. So far, there have provisionally been around 1,400 households in receipt of two or more primary measures between January 2025 and end of October 2025.
Heating controls are offered as optional secondary measures under GBIS for households in the low-income eligibility group. Since the start of GBIS, this has included ‘programmer and room thermostat’ and ‘thermostatic radiator valves’ (TRV). Following the ECO/GBIS mid-scheme changes, ‘smart thermostat’ was added to the heating controls offered under GBIS. So far, there have provisionally been around 1,300 smart thermostats installed between April 2025 and end of October 2025.
Delivery by region
The highest regional delivery of measure installations has been in the North West (16%), followed by the West Midlands (15%) and the North East (13%).
Figure 3: Proportion of Total Measures Installed by Geographic Region (April 2023 to October 2025)
The data used in Figure 3 can be found in the ‘Percentage of Total Measures Installed’ column of Table 4 in the Accompanying Tables.
The regional breakdown of upgraded households is largely the same as the regional breakdown of measures installed, as the majority of households (around 70,700 out of 85,900) have had only one measure installed under the scheme up to the end of October 2025. Most of the remaining households have had one or more heating control measures installed (these are secondary measures that can only be installed in households in the low-income eligibility group under the scheme).
There have been 85,900 households upgraded under GBIS up to the end of October 2025, meaning they have had at least one measure installed under the scheme. This is around 307 households upgraded per 100,000 households in Great Britain (based on estimated household levels for 2023). The rate of upgrades is higher in Wales at around 367 per 100,000. In England, the rate is closer to that of Great Britain at around 316 upgrades per 100,000. Scotland has seen a lower rate of around 193 upgrades per 100,000. The region with the highest rate of upgrades is the North East with 784 households upgraded per 100,000.
Delivery by local authority area
GBIS measure delivery, upgrades and estimated rates per 100,000 households are provided at the local-authority level in Table 5 of the Accompanying Tables. The estimated rate of upgrades per 100,000 households is also presented in Map 1.
The level of delivery under GBIS varies at the local authority level. The local authorities with the highest rate of upgrades so far, to the end of October 2025, are West Lindsey (2,229 per 100,000 households), Stoke-on-Trent (1,913 per 100,000 households) and Redcar and Cleveland (1,301 per 100,000 households).
Map 1: Households upgraded under GBIS per 100,000 households by Local Authority (April 2023 to October 2025)
The data used in Map 1 can be found in the ‘GBIS households upgraded per 100,000 households’ column of Table 5 in the Accompanying Tables.
GBIS costs
This release includes updated quarterly GBIS costs data, which is provided by energy suppliers.
GBIS delivery costs are the purchase costs of a GBIS measure in a property which may include the costs associated with searching for properties, installation costs and marketing costs by delivery partners involved with promoting the scheme. These costs exclude VAT.
GBIS administrative costs include direct administrative costs (IT set up and maintenance, lead generation and marketing, delivery, commercial strategy and policy, processing, reporting and compliance, and technical monitoring) and indirect administrative costs (legal, finance and HR costs, accommodation and ‘other’).
Total GBIS delivery costs up to the end of September 2025 were around £320.7 million, with an additional £19.9 million in administrative costs. This made the total cost of the scheme to the end of September 2025 £340.6 million.
Up to the end of September 2025, the average cost of delivering the GBIS obligation was £25.43 per £ annual bill savings. This was similar to the end of June 2025 where the cost was £25.53 per £ annual bill savings.
The next update to the quarterly GBIS costs data will be in the 26 March 2026 release.
Annex: Further Information
Next publication date
The next publication will be at 09:30am on Thursday 22 January 2026.
Scheme Information
More information on the GBIS scheme can be found at the Department’s website and at Ofgem.
Accompanying tables
Tables showing the number of measures installed and households upgraded under GBIS are available.
Revisions policy
The Department’s statistical revisions policy sets out the revisions policy for these statistics, which has been developed in accordance with the UK Statistics Authority Code of Practice for Statistics.
User engagement
Users are encouraged to provide comments and feedback on how these statistics are used and how well they meet user needs. Comments on any issues relating to this statistical release are welcomed and should be sent to: EnergyEfficiency.Stats@energysecurity.gov.uk. The Department’s statement on statistical public engagement and data standards sets out the department’s commitments on public engagement and data standards as outlined by the Code of Practice for Statistics.
Pre-release access to statistics
Some ministers and officials receive access to these Official Statistics up to 24 hours before release. Details of the arrangements for doing this and a list of the ministers and officials that receive pre-release access to these statistics can be found in the Department’s statement of compliance with the Pre-Release Access to Official Statistics Order 2008.
Contact
Responsible statisticians: Darren Stillwell and Mark Piatek
Email: EnergyEfficiency.Stats@energysecurity.gov.uk
Media enquiries: 020 7215 1000
Public enquiries: 07860 511211