Great British Insulation Scheme release: April 2026

This release includes measures installed and households upgraded under the Great British Insulation Scheme ( GBIS ). As part of the scheme monitoring, the analysis is shown by measure type and geographical region. This scheme covers Great Britain. Data provided in the monthly release are two months in arrears. These statistics are provisional and are subject to future revisions. Enquiries about these statistics should be directed to: energyefficiency.stats@energysecurity.gov.uk 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 scheme officially ended on 31 March 2026. Statistics for March 2026 will be published in May 2026. Given there will be small revisions to existing measures for some months after this, we are currently gathering views via GOV.UK on the frequency of future GBIS statistics releases. 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 February 2026. Data on associated costs to the end of December 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 135,700 measures installed in 98,600 households up to the end of February 2026. There were 5,000 measures installed in 3,100 households during February 2026. This was an increase of 7% in measure delivery compared to January 2026. Average measure delivery per month in the last three months (December to February 2026) was 5,100. 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 targeted 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 identified and referred on to the scheme households that were 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 February 2026, around 72,400 (53%) of the measures installed under GBIS were delivered to households in the low-income eligibility group. Of these measures, around 11,600 were delivered under the Flexible Eligibility mechanism. To the end of February 2026, around 37,700 (38%) of the households upgraded under GBIS were in the low-income eligibility group. Of those, around 4,300 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 February 2026, around 10,200 innovation measures were installed. Delivery by measure type The most common measure so far has been cavity wall insulation, accounting for 50,100 (37%) of the total 135,700 measures. This was followed by loft insulation which accounted for 38,400 measures (28%) and heating controls which accounted for 34,200 measures (25%). Figure 2: Number of Measures Installed by Measure Type (April 2023 to February 2026) The data used in Figure 2 can be found in Table 3 of the Accompanying Tables . Following the ECO/GBIS mid-scheme changes , which came into effect in Spring 2025 for measures installed from mid-November 2024 onwards, households became able to receive two primary measures under GBIS in certain circumstances. The current data provisionally shows around 3,000 households in receipt of two primary measures between January 2025 and end of February 2026. This was 5.8% of households upgraded since the first household with two primary measures appeared in the data in January 2025. Delivery by region The highest regional delivery of measure installations has been in the North West and the West Midlands (both 15%), followed by the North East (13%) and Yorkshire and The Humber (11%). Figure 3: Proportion of Total Measures Installed and Total Households Upgraded by Geographic Region (April 2023 to February 2026) The data used in Figure 3 can be found in the ‘Percentage of Total Measures Installed’ and ‘Percentage of Total Households Upgraded’ columns 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 78,700 out of 98,600) had only one measure installed under the scheme up to the end of February 2026. Most of the remaining households 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 98,600 households upgraded under GBIS up to the end of February 2026, meaning they have had at least one measure installed under the scheme. This is around 347 households upgraded per 100,000 households in Great Britain (based on estimated household levels for 2025). The rate of upgrades is higher in Wales at around 413 per 100,000. In England, the rate is closer to that of Great Britain at around 356 upgrades per 100,000. Scotland has seen a lower rate of around 224 upgrades per 100,000. The region with the highest rate of upgrades is the North East with 896 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 are Stoke-on-Trent (2,189 per 100,000 households), West Lindsey (2,177 per 100,000 households) and Barking and Dagenham (1,661 per 100,000 households). Map 1: Households upgraded under GBIS per 100,000 households by Local Authority (April 2023 to February 2026) 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 . Delivery by property type and tenure Data on the property type and tenure of properties receiving measures under GBIS (Tables 7 and 8 of the Accompanying Tables ) were last updated in the earlier release published on 19 February 2026, covering quarterly data on the property type and tenure type of households upgraded under GBIS to the end of December 2025. The next update to Tables 7 and 8 will be in the 21 May 2026 release. Houses were the most common property type upgraded under GBIS to the end of December 2025, accounting for around 74,200 (80%) of the upgraded households. This was followed by Bungalows, which accounted for 15%, Flats, which accounted for 5%, and Maisonettes, which accounted for less than 1%. The most common tenure of households upgraded under GBIS to the end of December 2025 was owner-occupied, making up around 74,800 (81%) of the upgraded households. This was followed by socially rented households, which accounted for 11% and private rented households, which accounted for 8%. GBIS costs Data on associated costs (Tables 9 and 10 of the Accompanying Tables ) were last updated in the earlier release published on 26 March 2026, covering quarterly GBIS costs data to the end of December 2025. Those tables are based on quarterly GBIS cost reports submitted 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 December 2025 were around £366.0 million, with an additional £22.1 million in administrative costs. This made the total cost of the scheme to the end of December 2025 £388.1 million. Up to the end of December 2025, the average cost of delivering the GBIS obligation was £25.44 per £ annual bill savings. This was similar to the end of September 2025 where the cost was £25.43 per £ annual bill savings. Annex: Further Information Next publication date The next publication will be at 09:30am on Thursday 21 May 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 ### Cover_sheet | Great British Insulation Scheme (GBIS) Statistics | | | | | --- | --- | --- | --- | | This spreadsheet contains a selection of data tables to provide an overview of the progression of the Great British Insulation scheme (GBIS). | | | | | The Government announced the scheme at the end of March 2023. The £1 billion scheme aimed to help the least energy efficient households across the country with the cost of installing new home insulation. The scheme ran until 31 March 2026. Statistics for March 2026 will be published in May 2026. | | | | | GBIS has run alongside the current Energy Company Obligation scheme (ECO4). Legislation relating to the scheme came into force on 25 July 2023, with delivery on or after 30 March until 24 July 2023 being known as early delivery measures. | | | | | This release presents the latest statistics on GBIS, based on provisional data provided by Ofgem of the installations of measures between 30 March 2023 and 28 February 2026. Data on associated costs to the end of December 2025 (Tables 9 and 10) are based on quarterly GBIS cost reports submitted by energy suppliers. | | | | | All figures are provisional and subject to revision | | | | | For more information on GBIS, please see: | | | | | https://www.gov.uk/apply-great-british-insulation-scheme | | | | | https://www.ofgem.gov.uk/environmental-and-social-schemes/great-british-insulation-scheme | | | | | Mid-scheme changes to ECO4 and GBIS following the government consultation are now included in the statistics. For more information, please see: | | | | | Energy Company Obligation 4 and the Great British Insulation Scheme: mid-scheme changes - GOV.UK | | | | | Publication dates | | | | | The data tables in this spreadsheet were published at 09:30am Thursday 23 April 2026. | | | | | Data Coverage | | | | | Data covered in this release is for delivery to the end of February 2026 and associated costs to the end of December 2025. | | | | | Data covered in this release is for Great Britain. | | | | | Data are based on the date of completed installation of measures as recorded in the Ofgem data. | | | | | Units, notes and no data | | | | | Some cells in this workbook refer to notes, which can be found in the 'Notes' worksheet. Note markers are presented in square brackets, for example [note 1]. | | | | | Some cells of tables may be populated with the note marker [x] to indicate that no data is available or [z] to indicate 'not applicable'. In Tables 5 and 6, certain cells have intentionally been left blank to enhance the readability of geography hierarchies in columns B, C and D of Table 5 and in columns B and C of Table 6 with an explanation given at the top of those worksheets. | | | | | Some column headings specify units. When this is the case, units are presented in round brackets to differentiate them from note markers. | | | | | Contact Details | | | | | Press Enquiries to the Press Officer: 020 7215 5975; or the news desk: 020 7215 1000 | | | | | Responsible Statisticians: Darren Stillwell and Mark Piatek | | | | | EnergyEfficiency.Stats@energysecurity.gov.uk | | | | | 07860511211 | | | | | This workbook was updated on: | 2026-04-23 00:00:00 | | | | The next update for these statistics is: | 2026-05-21 00:00:00 | | | ### Contents | Table of contents | | | | | --- | --- | --- | --- | | Publication date: | 2026-04-23 00:00:00 | | | | Data Period: | 30 March 2023 to 28 February 2026 | | | | Geographical Coverage: | Great Britain | | | | All figures are provisional and subject to revision. | | | | | These table numbers are subject to change in future releases, as additional and more detailed analysis are included. | | | | | Worksheet number | Worksheet Title | Date the data was last updated | Next publication date | | Notes | Notes used in this workbook | Not applicable | Not applicable | | T1 | Table 1 - Number of Measures Installed by Month | 2026-04-23 00:00:00 | 2026-05-21 00:00:00 | | T2 | Table 2 - Number of Households Upgraded by Month | 2026-04-23 00:00:00 | 2026-05-21 00:00:00 | | T3 | Table 3 - Number of Measures Installed by Measure Type | 2026-04-23 00:00:00 | 2026-05-21 00:00:00 | | T4 | Table 4 - Number of Households Upgraded and Measures Installed by Geographic Region | 2026-04-23 00:00:00 | 2026-05-21 00:00:00 | | T5 | Table 5 - Number of Households Upgraded and Measures Installed by Administrative Area | 2026-04-23 00:00:00 | 2026-05-21 00:00:00 | | T6 | Table 6 - Number of Measures Installed and Households Upgraded by Parliamentary Constituency | 2026-04-23 00:00:00 | 2026-05-21 00:00:00 | | T7 | Table 7 - Households in receipt of GBIS measures by property type and quarter | 2026-02-19 00:00:00 | 2026-05-21 00:00:00 | | T8 | Table 8 - Households in receipt of GBIS measures by tenure and quarter | 2026-02-19 00:00:00 | 2026-05-21 00:00:00 | | T9 | Table 9 - Estimated GBIS costs by quarter | 2026-03-26 00:00:00 | To be confirmed | | T10 | Table 10 - Estimated average GBIS delivery costs as reported by energy suppliers | 2026-03-26 00:00:00 | To be confirmed | ### Notes | Notes | | | --- | --- | | This worksheet contains one table. | | | Note number | Note text | | [note 1] | Number of measures installed is a count of the number of energy efficiency measures installed in a household under GBIS. Data are based on installation completion date and hence only include installations where completion date is known. | | [note 2] | Installations are based on data provided by Ofgem. | | [note 3] | GBIS is designed to target a wide range of households in a general eligibility group as well as households in a low-income group. A number of households currently have their eligibility type as 'unknown' and a very small number of households are 'in-fill', meaning they were otherwise not eligible for the scheme. For this reason, the combined total of measures from the general and low-income groups presented in this table does not sum to the overall total. | | [note 4] | Support for households in the low-income group mirrors the eligibility criteria for the Help to Heat Group (HTHG) within ECO4. Households who receive specific benefits (or if in receipt of Child Benefit and are below the equivalised income threshold for the household composition) are members of the low-income group. | | [note 5] | The Flexible Eligibility (Flex) component of GBIS allows Local Authorities (LAs) to 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. Suppliers can deliver up to 80% of their GBIS low-income obligation through Flex. | | [note 6] | The Innovation Measure component of GBIS is a mechanism for the delivery of innovative measures that can demonstrate an improvement over comparable measures currently deliverable under the scheme. This route is specific to measures in the low-income group and/or delivery to social housing band D. Innovation measures must first be eligible under the ECO4 scheme to be installed under GBIS. Measures deliverable under this route are capped at 10% of a suppliers' GBIS low-income obligation. | | [note 7] | It is possible for a measure delivered through Flexible Eligibility to also be an Innovation Measure. | | [note 8] | Number of households upgraded is a count of the number of households where at least one energy efficiency measure has been installed. | | [note 9] | The date when a household was upgraded under GBIS is taken as the date when the first measure installation was completed at a given household under the scheme. For example, if a household had measures installed in May 2023 and June 2023 then the upgrade date of that household would be May 2023. | | [note 10] | Estimated number of households with at least one usual resident in each local authority in 2025. Sources are provided in notes 11, 12 and 13. | | [note 11] | Households with at least one usual resident per local authority, mid-2025, in England. This was sourced from Office for National Statistics 2022-based household projections for England. That data can be found in Table 406 of the 2022-based household projections at the following hyperlink. Note: the 2023 Local Authority Geographies Edition of the dataset was used to cover those authorities created as at 1 April 2023 (for Sheffield and Barnsley, the estimated number of households with at least one usual resident is still based on pre-April 2025 geography boundaries): https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationprojections/datasets/householdprojectionsforengland | | [note 12] | Households with at least one usual resident per local authority, mid-2025, in Wales. This was sourced from the Welsh Government’s 2022-based household projections for Wales. That data (principle projection of Total Households for mid-year 2025) can be found at the following hyperlink: https://stats.gov.wales/en-GB/a2102ed7-52ff-4f58-a7eb-750b06bb8fa8 | | [note 13] | Households with at least one usual resident per local authority, mid-2025, in Scotland. This was sourced from National Records of Scotland 2022-based household projections for Scotland. That data (Detailed Tables, Principal Tables, by council area) can be found in Table 6 of the downloadable household-projection data at the following hyperlink: https://www.nrscotland.gov.uk/publications/household-projections-for-scotland-2022-based/ | | [note 14] | Data presented at the parliamentary constituency level are based on the new Westminster Parliamentary Constituencies that came into effect on 4 July 2024. | | [note 15] | Estimated number of households with at least one usual resident in each parliamentary constituency as at 2021 (England and Wales) or 2022 (Scotland) using the latest available census data. Sources are provided in notes 16 and 17. | | [note 16] | Estimated number of households with at least one usual resident in each parliamentary constituency as at 2021 in England and Wales. This was sourced from Office for National Statistics 2021 Census estimates as at census day, 21 March 2021. That data can be found at: https://www.ons.gov.uk/datasets/create/filter-outputs/49bd443b-cee8-4a5d-a923-498bced4d915#get-data | | [note 17] | Estimated number of households with at least one usual resident in each parliamentary constituency as at 2022 in Scotland. This was sourced from National Records of Scotland, Table UV406 - Household size, all occupied household spaces, United Kingdom Parliamentary Constituency 2024, households. That data can be found at: https://www.ons.gov.uk/datasets/create/filter-outputs/49bd443b-cee8-4a5d-a923-498bced4d915#get-data | | [note 18] | This table is updated quarterly. For more recent total upgraded household figures, please see Tables 2, 4, 5 and 6 which are updated monthly. | | [note 19] | For properties in England and Wales, data from the Valuations Office Agency (VOA) was used to identify property type. For properties in Scotland, data from TrustMark and Ofgem were used to identify property type. | | [note 20] | Percentage of households is calculated for only those where property type is known. | | [note 21] | Percentage of households is calculated for only those where the tenure is known. | | [note 22] | Total estimated GBIS delivery and administrative costs include cost revisions submitted from some energy companies. | | [note 23] | 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. | | [note 24] | 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 in direct administrative costs (legal, finance and HR costs, accommodation and ‘other’). | | [note 25] | Apr - Jun 2023 additionally includes any GBIS set up administrative costs for Jan - Mar 2023. | | [note 26] | Annual bill cost savings are based on scores given when measures are installed under the scheme. More information can be found in the Ofgem guidance: https://www.ofgem.gov.uk/publications/great-british-insulation-scheme-delivery-guidance | | [note 27] | Average cost per £ saved on energy bills for GBIS measures across all suppliers. | | [note 28] | Suppliers have delivered different amounts against each obligation. The Median, Upper and Lower Quartile of average cost per £ of annual bill saving for individual suppliers should therefore be treated with caution as they may relate to different levels of delivery, different measures installed and different routes of meeting the obligation. | | [note 29] | Percentages may not sum to 100% due to rounding. | | [note 30] | Following the government consultation on mid-scheme changes to ECO4 and GBIS, it is now permitted for two of the following types of insulation measures to be installed in a household under GBIS under certain circumstances rather than just one type: cavity wall, loft, underfloor, solid floor and pitched roof insulation. Hence, households with two primary insulation measures have started to be reflected in the data from the May 2025 publication onwards. For more information, please see the government response to the consultation: https://www.gov.uk/government/consultations/energy-company-obligation-4-and-the-great-british-insulation-scheme-mid-scheme-changes | | [note 31] | Following the government consultation on mid-scheme changes to ECO4 and GBIS, the types of heating control measures that can be installed as optional secondary measures in low-income households under GBIS has been expanded to include 'smart thermostat' (see the 'Smart Thermostat' row introduced into Table 3 in the July 2025 publication onwards). For more information, please see the government response to the consultation: https://www.gov.uk/government/consultations/energy-company-obligation-4-and-the-great-british-insulation-scheme-mid-scheme-changes | | [note 32] | Area codes that came into effect during April 2025 are shown for Barnsley (E08000038) and Sheffield (E08000039) in Table 5. | | [note 33] | Note that suppliers can apply to Ofgem for reassignment of bill savings from ECO4 to GBIS. Final annual bill savings will be provided in a future release. | | [c1] | Values between 1 and 4 (inclusive) that have been supressed to prevent disclosure. | | [c2] | Values of 5 or more that have been supressed where another value within the group was suppressed to prevent disclosure. | | [z] | Not applicable |