Code for Sustainable Homes. Laura Seymour

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1 Code for Sustainable Homes Laura Seymour

2 Overview of presentation The Code for Sustainable Homes was introduced in April In this presentation we discuss: How the Code works Code ratings and setting benchmarks Energy and renewable technologies Overview of other topics assessed Case studies

3 Environmental issue categories assessed Energy & CO 2 Emissions Water Materials Surface Water Run-off Waste Pollution Health & Well-being Management

4 Scoring Ratings from 1 star to 6 star Rating relates to Percentage of overall points awarded across 34 issues Whether the mandatory requirements for different ratings have been met Unclassified if the minimum requirements are not met Star Rating Total percentage points score required

5 Example Certificate

6 Setting Benchmarks Current benchmarks (but rapidly changing!) Standard Practice Good Practice Best Practice Advanced Practice Aspirational Practice Aspirational Practice Code Rating Unrated 1 to 2 star 3 star 4 star 5 star 6 star Year certain Code elements may become mandatory Draft Strategy for Sustainable Construction (2007), BERR

7 Approximate additional cost above Building Regulations for achieving each Code Level Code Level Traditional Detached Traditional End Terraced Traditional Low Rise Traditional High Rise , ,326 2,506 2,385 3, ,025 5,059 3,388 6, ,184 14,726 8,297 16, ,073 26,012 34,074 35, Figures are a per dwelling cost based on research carried out by English Partnerships (A cost review of the Code For Sustainable Homes)

8 Energy- Mandatory Issues Code Level 1 Code Level 2 Code Level 3 Code Level 4 Code Level 5 Code Level 6 % Reduction in CO 2 emissions required compared to Building Regs True zero carbon Additional % improvement compared to previous Code level Approx. 100 Definition of zero carbon: the net carbon dioxide emissions for ALL energy used in the building is zero, including energy used in cooking and to power appliances which is not covered by Building regulations. Note that there is an exponential increase in CO 2 emissions to gain higher Code Levels:

9 Reducing CO 2 Emissions: Improved Building Design 1) Be LEAN- Use less energy 2) Be CLEAN- Use energy efficiently 3) Be GREEN- Use renewables Steps 1 and 2: Improved building design to reduce energy demand: Effective use of solar gain Low U values Low air permeability Energy efficient building services systems and controls German Passiv Haus Potential improvement: Up to 20-25% in housing using current best practice techniques Passiv Haus approach virtually eliminates need for heating and could achieve up to 60% reduction

10 Reducing CO 2 Emissions: Renewable and Low emission technologies Step 3: Choose a building services strategy that will reduce or eliminate CO 2 emissions Technologies that help to reduce heating/ hot water demand: Solar hot water Biomass boilers Biomass combined heat and power/ CHP Community heating powered by waste Biomass Boiler Technologies that help to meet electricity (lighting/power) demand: Solar photovoltaics Wind turbines Biomass combined heat and power/ CHP Small scale hydro power Wind Turbine

11 Photovoltaics and the Code ENE1 Dwelling Emission Rate: reductions in CO 2 emissions One of the few technologies available to provide renewable electricity, essential to gain higher Code levels ENE 7 Low or Zero Carbon (LZC) technologies: 1 credit awarded if 10% or 2 credits if 15% of total energy provided by LZCs. Need to consider solar design at an early stage. Related benefit- HW1 daylighting credit

12 Energy- Non Mandatory Issues Low energy lighting PIR/ daylight sensors/ timers on external lighting Provision to dry clothes naturally Energy labelled white goods Low Energy Light Bulbs Low or zero carbon technologies Cycle storage Home office Solar Tube Skylight

13 Water Code Level 1 and 2: 120L/ person/ day Low water usage appliances Code Level 3 and 4: 105L/ person/ day Ultra-low usage appliances OR low water usage appliances PLUS rainwater harvesting/ greywater recycling Code Level 5 and 6: 80 L/ person/ day Ultra-low usage appliances PLUS rainwater harvesting/ greywater recycling for toilet flushing and washing machines Affects aspects of living i.e. smaller baths, slower running showers and taps Additional credit for using rainwater for irrigation

14 Materials Environmental impact of materials Green Guide to Specification 2008 Material specifications assigned a rating from A+ to E Mandatory requirement that at least 3 of the 5 building elements (roof, external walls, internal walls, floors, windows) have a rating A+ to D Responsible sourcing of materials Certified timber Other materials from ISO14001 or EMAS accredited manufacturers hhh

15 Surface Water Run-off Management of surface water runoff Mandatory requirement that the peak rate of runoff does not increase Credits awarded for use of SUDs techniques to reduce runoff rates Flood risk Buildings will obtain a higher rating if they are located in a low flood risk area

16 Waste Site Waste Management Plans for site preparation/ construction phase mandatory Monitor waste generated and volumes recycled Set targets for waste reduction Outline procedures for meeting these targets Internal and external recycling bins Composting

17 Pollution Global warming potential (GWP) of insulants NO x emissions

18 Health and Wellbeing Daylighting Sound insulation Private space Lifetime homes

19 Management Home user guide Considerate Constructors Scheme Construction site impacts Security Secured by design recommendations

20 Ecology Ecological value of the existing site Protection of ecological features Ecological enhancement Change in ecological value of the site Building footprint

21 Case Study: Illingworth Development Housing development in Halifax, West Yorkshire Most homes built to EcoHomes Very Good, two upgraded to CSH Level 4* First saleable Code Homes in the country to be completed Extra Over Cost: 14K/unit

22 Case Study: Illingworth Development cont. 54% Improvement in CO 2 emissions achieved 17% through fabric improvements alone - air tightness of 5m 3 /hr/m 2 - careful detailing - fully insulated 300mm cavity - low U values including Krypton filled U values 2.5m 2 solar PV panel Exhaust air heat pump instead of gas boiler

23 Case Study: Hanson EcoHouse CSH Level 4* High thermal mass Passive stack ventilation Ground source heat pump Solar hot water Rainwater collected for WC flushing and irrigation ISO14001 certified clay and concrete materials

24 Case Study: Stewart Milne s Group Sigma Home CSH Level 5* Reduction in Carbon Dioxide Emissions Solar Thermal Water Heating Photovoltaics Micro-wind Technologies Stewart Milne s Group Sigma Home built at BRE Innovation Park Grey water recycling Passive Ventilation

25 ? Questions

Code for Sustainable Homes Guidelines

Canoldir Penrhos Anglesey LL65 2TS Phone: 01407 860666 Email: saps@easonline.co.uk www.easonline.co.uk Code for Sustainable Homes Guidelines A CSH rating is the responsibility of the Developer/ Architect