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The Code for Sustainable Homes: Towards Zero Carbon. Alan Yates Technical Director, BREEAM BRE Certification. Overview. Based on EcoHomes 2006 Linked to continuous improvement in legislation, policy and good practice Amended scope of assessment Amended assessment criteria
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The Code for Sustainable Homes: Towards Zero Carbon Alan Yates Technical Director, BREEAM BRE Certification
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
Level 5 Level 4 Level 2 Level 3 Level 1 Level 6 Regulatory minimum Mass market Number of buildings CSH Aspirational Minimal Environmental Standards
Code Issue Categories • Waste • Pollution • Health & Well-being • Management • Ecology • Energy/CO2 • Water • Materials • Surface Water Run-off
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 •
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 %
Minimum Energy Standards Based on SAP:2005 calculation and % improvement on 2006 Building Regulations Part LA
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
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).
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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
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.
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