The Code for Sustainable Homes: Towards Zero Carbon

1. The Code for Sustainable Homes: Towards Zero Carbon Alan Yates Technical Director, BREEAM BRE Certification

2. Overview • Based on EcoHomes 2006 • Linked to continuous improvement in legislation, policy and good practice • Amended scope of assessment • Amended assessment criteria • Post construction certification • Only covers New build in England

3. Major differences

4. Level 5 Level 4 Level 2 Level 3 Level 1 Level 6 Regulatory minimum Mass market Number of buildings CSH Aspirational Minimal Environmental Standards

5. Code Issue Categories • Waste • Pollution • Health & Well-being • Management • Ecology • Energy/CO2 • Water • Materials • Surface Water Run-off

6. Issue Category Scores Environmental Weightings Overall Score Waste • Waste • Materials • Materials • Water Surface Run - off • Mandatory Standards Water Surface Run - off • Energy • Energy • Potable Water • Potable Water • Consumption Consumption Energy • Energy • Potable Water • Potable Water • Consumption Consumption Level 1 Waste • Waste • Level 2 Materials • Materials • Level 3 Tradable Credits Water Surface Run - off Level 4 • Water Surface Run - off • Level 5 Pollution • Pollution • Level 6 Health & Wellbeing • Health & Wellbeing • Management • Management •

7. Weightings Energy 36.4 % Potable Water 9 % Surface Water Runoff 2.2 % Materials 7.2 % Waste 6.4 % Pollution 2.8 % Health and Wellbeing 14 % Management 10 % Site Ecology 12 %

8. Code levels and points score

9. Minimum standards

10. Minimum Energy Standards Based on SAP:2005 calculation and % improvement on 2006 Building Regulations Part LA

11. Minimum Carbon Dioxide Emissions Standards Building Regulations Part L1a: 2006 • Target Emission Rate (TER) – minimum requirement • Dwelling Emission Rate (DER) – actual emissions • 30% dedicated low energy lighting provision • Compliance with other aspects – Fabric Backstop standards

12. Minimum Energy Standards The Code requirements (as ADL:2006) Levels 1-5 • The % improvement in the actual emissions over the target emission for each Code Dwelling type. • i.e. [1-(DER/TER)] *100% • Accredited energy assessor/Part L ‘competent person’- The term ‘SAP Assessor’ is to be replaced • When a building contains more than one dwelling, area-weighted average DER and TER for the building as a wholeis acceptable (as described in clause 23 of Approved Document L1A).

13. Minimum Energy Standards The Code requirements (as ADL:2006) Level 6 – Where net Carbon Dioxide emissions resulting from ALL energy use in the dwelling is Zero. • Must meet Level 5 threshold by on site means • Heat Loss Parameter (HLP) of ≤0.8m3/hr/m2 • Appliances demand can be met • by on site renewables/low carbon technologies • OR by off site independently accredited renewables • Some ESCOs comply where directly supplying • Definition very similar to HM Treasure Stamp Duty relief

14. Ene 1 – Dwelling Emission Rate

15. Passiv Haus Standard – UK Standard

16. Minimum Carbon Dioxide Emissions Standards The following are not covered within SAP at present but can be taken into account: • Cooling • LZC technologies not covered by SAP • Newer low energy technologies • Lighting • Appliance loads

17. Tradable Credits Tradable credits awarded: • for higher performance levels in some key issues • for remaining issues • Broadly as in EcoHomes 2006 • Location issues omitted • Some additional credits

18. Tradable Credits - Energy Ene 1 - Dwelling Emission Rate (DER) • Additional credits available for achieving a higher scale percentage improvement over Building Regulations • Credits based on % improvement above Building Regulations part L1a instead of actual CO2/m2/year as under EcoHomes 2006

19. Tradable Credits - Energy Ene 2 - Building Fabric • Credits awarded based on the Heat Loss Parameter obtained from the SAP calculations • HLP ≤ 1.1 or 1.3 • Same as EcoHomes 2006

20. Tradable Credits - Energy Ene 3 - Internal Lighting • Credits awarded based on the % of dedicated energy efficient light fittings • 40% or 75% dedicated low energy light fittings • Same as EcoHomes 2006

21. Tradable Credits - Energy Ene 5 - Energy Labelled White Goods • Provision of specific EU Energy Efficiency Labelled white goods or • EU Energy Efficiency Labelling Scheme purchasing information. • Same requirement for social and private housing

22. Tradable Credits - Energy Ene 6 - External Lighting • Credits awarded based on the provision of dedicated energy efficient light fittings • Or security lighting with movement detectors and daylight shut-off devices • Same as EcoHomes 2006

23. Tradable Credits - Energy Ene 7 - Zero/Low Carbon Technologies • Credits for Zero/Low Carbon technologies where they make a significant contribution to the energy demands • 1 credit: 10% carbon dioxide reduction • 2 credits: 15% carbon dioxide reduction • 2 instead of 3 credits • Credits for feasibility study only dropped • Off site generation may be accepted under certain criteria

24. Tradable Credits – Other Categories • Potable water consumption • External water consumption • Daylighting • Drying Space • Home Office • Cycle Storage • Materials – embodied impacts including CO2 • Home User Guide • Building Footprint

25. Achieving Code Level 1 • Energy – 10% improvement over TER • Meeting the Energy Requirements • Improved thermal efficiency of building fabric • Reduction in air permeability • High efficiency condensing boiler • Reduction of thermal bridging • Other mandatory requirements • Additional 33 optional points

26. Achieving Code Level 3 • Energy – 25% improvement over TER • Meeting the Energy Requirements • Measures outlined for Code Level 1 • Maximum benefit from cost effective ‘conventional’ solutions to fabric and systems efficiency • + possible use of low or zero carbon technologies in some cases • Other mandatory requirements • Additional 47 optional points

27. Achieving Code Level 4 • Energy – 44% improvement over TER • Meeting the Energy Requirements • High performance building fabric and efficient systems/controls • + some use of low or zero carbon technologies • Other mandatory requirements • Additional 54 optional points

28. Achieving Code Level 5 • Energy – 100% improvement over TER • Meeting the Energy Requirements • High performance building fabric and efficient systems/controls • + significant use of low or zero carbon technologies (individual dwelling or community system). • No off site renewables unless independently accredited and ‘additional’. • Other mandatory requirements • Additional 60 optional points

29. Achieving Code Level 6 • Energy – Approximately 145% improvement over TER • Meeting the Energy Requirements • Optimal performance building fabric and systems/controls • use of low or zero carbon technologies (individual dwelling or community system). • Likely to include use of off site renewables but must be: • independently accredited • ‘additional’. • Other mandatory requirements • Additional 60 optional points

30. A Two-stage Process • Design Stage • Based on design drawings, specifications and commitments • Results in interim certificate of compliance + • Post Construction Review • Based the design stage information • Confirmation of compliance through site records and visual inspection. • Code certificate awarded based on compliance at this stage.

31. BRE – Innovation Park Houses

32. Food for thought • Achieving zero carbon is not easy but it is achievable • We have limited experience to date but a lot of knowledge to help • Code presents a tool for measuring and evaluating performance