The Code for Sustainable Homes

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Climate Change

Stern review

• Climate change is real

• Strong and early action is needed

• Economic impact– Acting now outweighs cost of not acting

• Environmental impact– Reduced risk at stabilized levels of CO2e

Significant Energy Use in Homes

•Over 25% of UK carbon emissions come from domestic housing•Over 50% of domestic housing emissions arise from space heating and 20% from heating water

Space Heating53%

Water Heating20%

Lighting6%

Appliances16%

Cooking5%

Regulations

• Up to now– Control of emission through Part L

• 25% reduction in CO2 in 2002 revision• Further 20% reduction in 2006 revision• Sets minimum standards

• Ideal scheme– To set environmental performance standards better than regulations– To encourage voluntary compliance – a marketing advantage– To provide a clear roadmap and timetable– To work in conjunction with Building Regulations

The Code

• Based on ‘environmental impact’ of nine categories

• Proposes a system with six levels– Code level 1 – one star– …– …– Code level 6 – six stars

StarsSustainability assessment• Compliance with Code standards

– Sustainability rating– One star ( ) – entry level above Regs.– Six stars – highest level

• Code level pointsLevel 1 ( ) 36 pointsLevel 2 ( ) 48 pointsLevel 3 ( ) 57 pointsLevel 4 ( ) 68 pointsLevel 5 ( ) 84 pointsLevel 6 ( ) 90 points

Environmental CategoriesNine Categories

• Energy and CO2 – min. mandatory standard at all levels

• Water – min. mandatory standards at all levels• MaterialsMaterials• Surface water run-offSurface water run-off• WasteWaste• Pollution• Health and wellbeing• Management• Ecology

Credits and Points

• Credits must be converted to points

• Credits do not have the same value between categories

• Environmental weighting factors– Represent environmental impact of categories– Used to convert credits to points

Categories in Order of PointsNo of Credits in Category

Categroy 1 - Energy/CO2 29 credits 36.4%Category 2 - Water 6 credits 9.0%Category 3 - Materials 24 credits 7.2%Category 4 - Surface Water Run-off 4 credits 2.2%Category 5 - Waste 7 credits 6.4%Category 6 - Pollution 4 credits 2.8%Category 7 - Health and Well being 12 credits 14.0%Category 8 - Management 9 credits 10.0%Category 9 - Ecology 9 credits 12.0%Total 104 credits 100.0%

No of Credits in Category

Categroy 1 - Energy/CO2 29 credits 36.4%Category 7 - Health and Well being 12 credits 14.0%Category 9 - Ecology 9 credits 12.0%Category 8 - Management 9 credits 10.0%Category 2 - Water 6 credits 9.0%Category 3 - Materials 24 credits 7.2%Category 5 - Waste 7 credits 6.4%Category 6 - Pollution 4 credits 2.8%Category 4 - Surface Water Run-off 4 credits 2.2%Total 104 credits 100.0%

Environmental Impact CategoriesEnvironmental Weighting Factor(as % of total Possible Points Score available)

Environmental Impact Categories(as % of total Possible Points Score available)Environmental Weighting Factor

At a Glance

Points = (credits achieved / total credits in category) x environmental weighting factor for category

Minimum Standard No Minimum Standards 1- Energy 2- Water 3- Materials 4- Surface Water

Run-off 5- Waste 6- Pollution 7- H & WB 8- Management 9- Ecology

Points Points Code Level Standard (% better 2006 Part

L) Min Max

Standard (lit/p/d)

Min Max

Other Points Min Max Min Max Min Max Min Max Min Max Min Max Min Max

1 10 1.2 36.4 120 1.5 9 33.3 0.21 7.2 - 2.2 - 6.3 0.7 2.8 1.17 10.51 1.1 9.93 1.33 9.32 2 18 3.5 36.4 120 1.5 9 43 0.21 7.2 - 2.2 - 6.3 0.7 2.8 1.17 10.51 1.1 9.93 1.33 9.32 3 25 5.8 36.4 105 4.5 9 46.7 0.21 7.2 - 2.2 - 6.3 0.7 2.8 1.17 10.51 1.1 9.93 1.33 9.32 4 44 9.4 36.4 105 4.5 9 54.1 0.21 7.2 - 2.2 - 6.3 0.7 2.8 1.17 10.51 1.1 9.93 1.33 9.32 5 100 16.4 36.4 80 7.5 9 60.1 0.21 7.2 - 2.2 - 6.3 0.7 2.8 1.17 10.51 1.1 9.93 1.33 9.32 6 ZC 17.6 36.4 80 7.5 9 64.9 0.21 7.2 - 2.2 - 6.3 0.7 2.8 1.17 10.51 1.1 9.93 1.33 9.32

Cat 1: Energy and CO2

Max 29 credits (36.4 points)

•DER, 18.8 points•Building fabric, 2.4 points•Internal lighting, 2.4 points•Drying space, 1.2 points•Energy lablelled white goods, 2.4 points•External lighting, 2.4 points•Zero or low carbon technologies, 2.4 points•Cycle storage, 2.4 points•Home office, 1.2 points

CHS Points - Energy & CO 2

Ene 1

Emission, 18.8

Ene 2

Fabric, 2.5Ene 3

Light, int, 2.5

Ene 4

Drying, 1.3

Ene 5

Wt goods, 2.5

Ene 6

Light, ext, 2.5

Ene 7

Low/zero C, 2.5

Ene 8

Cycle store, 2.5

Ene 9

Home offi ce, 1.3

Emission Ene 1

Fabric Ene 2

Light, int Ene 3

Drying Ene 4

Wt goods Ene 5

Light, ext Ene 6

Low/zero C Ene 7

Cycle store Ene 8

Home offi ce Ene 9

Cat 2: WaterMax 5 credits (9 points)

•Internal potable water use, mandatory, maximum 7.5 points– ≤ 120 lit/p/day ≡ 1.5 points– ≤ 80 lit/p/day ≡ 7.5 points

• Dual flush WCs• Flow regulated taps• Low flow showers• Small baths• Water efficient appliances

•External potable water, not mandatory, 1.5 points– Greywater harvesting– Rainwater harvesting

Cat 3: MaterialsMax 24 credits (7.2 points)

•Environmental impact of materials, mandatory, maximum 4.5 points– At least three of the following must achieve A+ to D

• Roof Floors• External walls Windows• Internal walls

– A+ ≡ 3 creditds(0.9 point) C ≡ 0.5 credit (0.15 point)– A ≡ 2 credits (0.6 point) D ≡ 0.25 credit (0.07 point)– B ≡ 1 credit (0.3 point) E ≡ 0 credit (0 point)

•Responsible sourcing of materials, not mandatory– Basic building elements

• 80 % of materials responsibly sourced,1.8 points

– Finishing elements• 80 % of materials responsibly sourced, 0.9 points

Cat 4: Surface water run-offMax 4 credits (2.2 points)

•Reduction of site surface water run-off, mandatory, maximum 1.1 points– Attenuation from hard surfaces, 0.55 points– Attenuation from roofs, 0.55 points

•Flood risk, mandatory, maximum 1.1 points– Low probability of flooding, 1.1 points– Medium/high probability of flooding, 0.55 points

Cat 5: WasteMax 7 credits (6.3 points)

•Provision of waste storage of specified size, mandatory at all levels•Provision of household storage and recycling facility, max 3.6 points

– Provision of three internal recycling storage bins of certain size, 1.8 points– Provision of internal and external bins or LA collection scheme, 3.6 points

•Provision of a site waste management plan, mandatory at all levels (limited to construction costs greater than £200000

– Minimizing construction waste, 0.9 point– Minimizing construction waste and plans for sorting, reuse and recycling, 0.9

point•Composting, not mandatory, max 0.9 points

– Individual, communal or LA facilities, 0.9 points

Cat 6: PollutionMax 4 credits (2.8 points)

•Global Warming Potential (GWP) of insulants, not mandatory, max 0.7 point

– Insulating materials used in roofs, walls, floors, hot water cylinders and pipes, clod water storage tanks and doors should have GWP less than 5

•Reduction of NOx, not mandatory, max 2.1 points max points

– Dry Nox level (mg/kWh) ≤ 100, 0.7 point

– Dry Nox level (mg/kWh) ≤ 70, 1.4 points

– Dry Nox level (mg/kWh) ≤ 40, 2.1 points

•Exemplar dwelling, heat load reduction to no more than– 8% of reference dwelling, 0.7 points

– 6% of reference dwelling, 1.4 points

– 3% of reference dwelling, 2.1 points

Cat 7: Health & WellbeingMax 12 credits (14 points)

•Daylighting, not mandatory, max 3.5 points– Kitchen daylight factor (DF) 2% min, 1.16 points

– Living/dining rooms and studies DF 1.5%, 1.16 points

– 80% sky view,1.16 points

•Sound Insulation, not mandatory, max 4.67 points– PCT (3db better than AD E), 1.17 points

– RSD + PCT (5db better than AD E), 3.5 points

– RSD + PCT (8db better than AD E), 4.67 points

•Private Space, not mandatory, max 1.17 points– Accessible, dedicated outdoor sitting area, min 1.5m2/BR (private) and

1m2/BR shared, 1.17 points

•Liftime Homes, not mandatory, max 4.67 points

Cat 8: ManagementMax 9 credits (10 points)

•Home User Guide, not mandatory, max 3.33 points– Stand-alone guide, 2.22 points– Additional information on site and surroundings, 1.11 points

•Considerate Constructors Scheme, not mandatory, max 2.2 points– Regular 3rd party audit and certification, 1.1 points– Regular 3rd party audit plus CCS score above 32, 2.2 points

•Construction Site Impacts, not mandatory, max 2.2 points– Procedure to cover 2 or more of

• Management of site produced CO2, transport CO2, water, water and air pollution 2.2 points

•Security, not mandatory, max 2.2 points– Consulting an architectural liaison officer or crime prevention design office

at design stage, 2.2 points

Cat 9: EcologyMax 9 credits (12 points)

•Ecological Value of Site, not mandatory, max 1.33 points– Use of land of confirmed low ecological valueOr– Supply of expert report on low or insignificant value of site and keeping surrounding land

undisturbed, 1.33 points•Ecological Enhancement, not mandatory, max 1.33 points

– Appointment of a qualified ecologist and adoption of their recommendation, 1.33 points•Protection of Ecological Features, not mandatory, max 1.33 points

– Protection of potentially damageable eco features, 1.33 points•Change of Ecological Value of Site, not mandatory, max 5.33 points

– Minor –ve change (species/ha): between -9 and -3, 1.33 points– Neutral: between +3 and -3, 2.66 points– Minor enhancement: between +3 and +9, 4 points– Major enhancement: greater than +9, 5.33 points

•Building Footprint, not mandatory, max 2.66 points– Houses: net int. floor area/net ground floor area > 2.5:1, 1.33 points, > 3:1, 2.66 points– Flats: net int. floor area/net ground floor area > 3:1, 1.33 points, > 4:1, 2.66 points

Timetable of Events

Date 2010 2013 2016

Energy/carbon improvement compared to Part L 2006 25% 44% Zero carbon

Water 105 lit/p/d 105 lit/p/d 80 lit/p/d

Equivalent energy/carbon standard in the Code

Code level 3 Code level 4 Code level 6

How Much?

Code Level Cost Range £/unit

31700 – 6000

4 5000 – 16000

5 14000 - 33000

Implications

•Structural

•Proper assessment of ‘renewable energy’ installations e.g. wind turbines, solar panels etc

•Thermal bridging – issues with new wall tie types

•Air tightness – issues with condensation

•Health

•Increased air tightness – issues with asthma and mites

•Financial – new domain for ‘specialists’

House of the Future

Thank you for your time.