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Domestic and non-domestic energy performance certificates review: supplementary notes

Notes supplementing analysis of responses to our three public consultations about energy performance certificates (EPCs).


Footnotes

1. Review of default U-values for existing buildings in SAP, Consultation Paper: CONSP:16, available at https://www.bre.co.uk/filelibrary/SAP/2016/CONSP-16---Wall-U-values-for-existing-dwellings---V1_0.pdf

2. Changes to the Government's Standard Assessment Procedure (SAP), November 2017, available at: https://assets.publishing.service.gov.uk/government/uploads/system/uploads/attachment_data/file/660478/Government_Response_-_Changes_to_SAP_FINAL-v2.pdf

3. The additional resistance was also applied to as-built solid brick and as-built cavity walls across the same age bands.

4. Critical Appraisal of EPC Certification in Scotland, the Engine Shed, Stirling, March 16, 2018. Paper available from Energy Action Scotland, Suite 4a, Ingram House, 227 Ingram Street, Glasgow G1 1DA

5. See: Butcher, Craig, Butcher, Ken., Craig, Bonnie, & Chartered Institution of Building Services Engineers, issuing body. (2015). Environmental design: CIBSE guide A (Eighth ed.).

6. BRE (2014) In-situ measurements of wall U-values in English housing, BRE, Garston, available at https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/409428/In-situ_u-values_final_report.pdf

7. Op cit. 1, p6

8. Op cit. 5

9. Ibid. extract of Table 4 p13 of report

10. Scottish Office Building Directorate ( 1987) A Guide to Non-traditional Housing in Scotland 1923 -1955, HMSO, Edinburgh

11. personal experience of one of the authors of this report

12. Sustainable Energy Agency of Ireland (2012) Dwelling Energy Assessment Procedure (DEAP) Version 3.2.1 available from http://www.seai.ie/resources/publications/DEAP_Manual.pdf

13. archetype 1120110 – pre-1919,detached bungalow, 1.5 storeys, sandstone wall construction. The full specification of this archetype can be found at http://www.gov.scot/Topics/Statistics/SHCS/REEPSArchetypes

14. Developing regulation of energy efficiency of private sector housing (REEPS): modelling improvements to the target stock, available at http://www.gov.scot/Publications/2015/11/4536/downloads

15. RdSAP 2012 version 9.93 (19 November 2017) available at https://www.bre.co.uk/filelibrary/SAP/2012/RdSAP-9.93/RdSAP_2012_9.93.pdf

16. Taken from "Conventions (v 10.0) for RdSAP 9.92 and RdSAP 9.93" available at https://www.bre.co.uk/filelibrary/SAP/2012/RdSAP-Conventions-10_0---from-31-December-2017.pdf

17. See S3.9 on p12 of RdSAP 2012 version 9.93 (19 November 2017) available at https://www.bre.co.uk/filelibrary/SAP/2012/RdSAP-9.93/RdSAP_2012_9.93.pdf

18. Taken from "RdSAP Conventions for RdSAP 9.92" available at https://www.bre.co.uk/filelibrary/SAP/2012/RdSAP-Conventions.pdf

19. Op cit. 1, p4

20. Op cit. 1, p4

21. As modelled in Elmhurst Energy RdSAP software v9.93

22. Conventions (v 10.0) for RdSAP 9.92 and RdSAP 9.93, p17, available from https://www.bre.co.uk/filelibrary/SAP/2012/RdSAP-Conventions-10_0---from-31-December-2017.pdf

23. note: results from assessing a community heating boiler with flat rate charging with programmer and TRVs assessed on same property. Hot water provided directly from system; no stored hot water in dwelling. Only change is the community heating boiler fuel. Results assessed using Elmhurst Energy's currently approved RdSAP v9.93 software.

24. note: results from assessing a combined heat and power system with flat rate charging with programmer and TRVs assessed on same property. Hot water provided directly from system; no stored hot water in dwelling. Only change is the CHP system fuel. Results assessed using Elmhurst Energy's currently approved RdSAP v9.93 software.

25. That is, producing heat and electricity as opposed to just producing only heat and / or hot water.

26. The various CHP system factors needed to complete the SAP calculation were obtained as part of an assessment for a specific project in carried out for by Alembic Research for Aberdeen City Council: "Full SAP Calculation for CHP in Aberdeen Multi-story Blocks: Final Report (revised March 2015)" – unpublished report.

27. Results from RdSAP assuming mains gas as the system fuel

28. see SAP 2012: The Government's Standard Assessment Procedure for the Energy Rating of Dwellings https://www.bre.co.uk/filelibrary/SAP/2012/SAP-2012_9-92.pdf , p147

29. SAP 2012: The Government's Standard Assessment Procedure for the Energy Rating of Dwellings https://www.bre.co.uk/filelibrary/SAP/2012/SAP-2012_9-92.pdf

30. ibid, p49

31. ibid.

32. Plan Assessor 6.4.3

33. Elmhurst Energy's RdSAP v9.93 program

34. assessed using Elmhurst Energy RdSAP software v9.93 as of March 2018

35. Plan Assessor v6.3.4

36. op cit. 29

37. see http://www.gov.scot/Topics/Statistics/SHCS/REEPSArchetypes and Developing regulation of energy efficiency of private sector housing (REEPS): modelling improvements to the target stock, available at http://www.gov.scot/Publications/2015/11/4536/downloads

38. RdSAP 2012 version 9.93 (19 November 2017) available from https://www.bre.co.uk/filelibrary/SAP/2012/RdSAP-9.93/RdSAP_2012_9.93.pdf

39. Op cit. 1, p11

40. ibid

41. ibid

42. Op cit. 1, p12

43. Sheldrick, B and Hepburn, D (2009) Assessing the Appropriateness of the RdSAP Window Area Algorithms for Scotland, prepared for the Scottish House Condition Survey Team, unpublished report.

44. Sheldrick, B. and Hepburn, D. (2007) Assessing the Impact of the Central Heating Programme on Tackling Fuel Poverty: The First Three Years of the Programme 2001-2004 Final Report, available at https://www2.gov.scot/Publications/2007/03/23133305/18

45. see "A geometrical model of dwellings for use in simple energy calculations" by P.F.Chapman, Energy and Buildings 21 (1994) p 83 – 91

46. Only 7 properties were assessed, one from each age band, where the window area was adjusted for the extremes in the under-estimated and the over-estimated measurements given the pre-Central Heating Improvement condition. This analysis was repeated taking account of the improvements completed in them under the Central Heating Programme: in total, 28 impact assessments.

47. Conventions (v 10.0) for RdSAP 9.92 and RdSAP 9.93, available from https://www.bre.co.uk/filelibrary/SAP/2012/RdSAP-Conventions-10_0---from-31-December-2017.pdf

Contact

Email: Steven.Scott@gov.scot

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