Heat in Buildings: progress report 2026

Footnotes

1 2019 is included as a baseline, with further reporting starting in 2022. Due to the pandemic, fieldwork for the 2020 SHCS was suspended and the methodology for the 2021 SHCS was also affected.

2 SAP 2012 is the methodology currently used by the government to estimate the energy performance of homes. See UK Government website for more details: Standard Assessment Procedure - GOV.UK

3 Figures for previous years may differ from those published in earlier reports due to revisions made to the underlying data sources. These updates tend to reflect improved methodologies, corrections, or the incorporation of late returns.

4 Figures for previous years may differ from those published in earlier reports due to revisions made to the underlying data sources. These updates tend to reflect improved methodologies, corrections, or the incorporation of late returns.

5 Heat network operators must submit an updated notification within four years of the date of the previous notification under the HNMBR.

6 Figures for previous years may differ from those published in earlier reports due to revisions made to the underlying data sources. These updates tend to reflect improved methodologies, corrections, or the incorporation of late returns.

7 Figures in the table may not sum due to rounding.

8 Data accurate up to February 2025.

9 Heat network operators must submit an updated notification within four years of the date of the previous notification under the HNMBR.

10 Data accurate up to February 2025.

11 NDA data accurate up to February 2025.

12 Includes properties registered with ‘District Heating’ within the ‘Main Heating Fuel’ category.

13 See commentary: heat-buildings-progress-report-2025.pdf

14 Data is shown for those in-training as of 31 March of each year.

15 Data includes all modes of study (part time and full time). Early withdrawal enrolments have been removed.

16 Subject classifications can be found in the FES guidance document: FES Guidance notes 2022-23 - Scottish Funding Council (sfc.ac.uk).

17 Subject classifications can be found in the FES guidance document: FES Guidance notes 2022-23 - Scottish Funding Council (sfc.ac.uk).

18 Data combines undergraduate and postgraduate levels of study, all modes of study (part time and full time) and all years of study. Data is based on full person equivalents.

19 Subject classifications can be found on the HESA website; HESA - Experts in higher education data and analysis.

20 Green Finance Institute – UK Green Mortgage Products

21 Key areas are summarised at indicator 4.2.1B.

22 Ofgem publish historical price cap levels in their Final levelised cap rates model (available here: Energy price cap (default tariff) levels | Ofgem). The figures reported here exclude the standing charge, include VAT and are averaged over financial years.

23 Gas and electricity prices in the non-domestic sector

24 RIIO is ‘Revenues equals Incentives plus Innovation plus Outputs’. it is Ofgem’s framework to ensure that the monopoly companies operating gas and electricity networks have sufficient revenue to invest in and run their networks, and deliver what customers value. Please seeOfgem’s website for further information: RIIO-3 Final Determinations for the Electricity Transmission, Gas Distribution and Gas Transmission sectors | Ofgem

25 Tables refer to clean heating systems as zero direct emissions heating (ZDEH). These systems, such as heat pumps, district heating, electric storage heaters, wet electric heating and other direct electric, do not produce any greenhouse gas emissions at the point of use.

26 These measures include solar PV, solar thermal and battery storage.

27 Data is presented for both the HES Grant and Loan scheme and the HES Loan and Cashback scheme, with the former having replaced the latter in December 2022.

28 Includes secondary glazing, wastewater heat recovery systems, heating controls, cylinder thermostat and hot water tank jackets. It also includes gas boilers, for which numbers have been low.

29 ZDEH includes heat pumps.

30 ‘Other renewables’ include heat meters, wind turbines and hydro turbines.

31 Financial year 2023 to 2024 reporting begins with scheme launch in October 2023. Applications were held during transition period following the closing of the previous scheme in April 2023

32 Other includes district heating connections

33 ZDEH includes heat pumps and electric storage heaters. No biomass boilers were installed in 25/26.

34 Other includes solar thermal and clean heat repair

35 ZDEH includes heat pumps.

36 There are minor changes to the total figures for each year as Energy Saving Trust make updates in historic data.

37 ‘Other’ measures include lighting systems, commercial fridge and freezer units, double, triple and secondary glazing, high performance doors, and radiant heating units.

38 Biomass’ includes biomass boilers for all years and biomass room heaters from 2022 to 2023.

39 Procurement - non-domestic energy efficiency framework: guidance

40 The LCITP closed in 2022 but figures are provided based on the year in which the heat network project was awarded grant funding through LCITP or SHNF.

41 Heat network project reports - gov.scot (www.gov.scot)

42 Values are rounded and as such totals may not be exact.

43 Total Resource spend includes all resource expenditure required across the Heat in Buildings programme to fund delivery and policy implementation. This includes Advice Services, HES/SME Grant and Loan administration costs and pre-capital support.

44 Total investment includes financial transaction and capital expenditure, the return of income relating to closed schemes and return of cash through the re-awarding of the administration contract for our HES/SME Grant and Loan schemes. This was re-invested through Heat in Building schemes. Excludes recycling of loan income.

45 This was a transition year where the Advice Service was moved to a new delivery partner.

46 There was a transition in delivery stakeholder in 2021 – 2022 and data for this year is not available.

47 Data for investment in BES advice service starts from 2022 since we do not have reliable data for the previous Energy Efficiency Business Support Service scheme.