summary - house types April 09 Summary Report on Barratt Affordable House Types 5 & 6 Client: Authors: Barratt Homes West Midlands G P Gudge MSc BSc(Hons) CEng MIStructE M Wright MA Physics (Oxon) PGCE For C4Ci Ltd Commercial in Confidence C4Ci Limited 2009
summary - house types April 09 Introduction The following is a preliminary assessment of Barratt Affordable House Types 5 and 6. The assessment is based on the drawings provided. It is understood that these drawings are preliminary and can be developed to incorporate CSH information. SAP Assessment Affordable House Type 5 End Terrace Barratt Code 3 Specification Commercial in Confidence C4Ci Limited 2009-1-
Affordable House Type 5 End Terrace BesBlock Code 3 Specification Commercial in Confidence -2- Å C4Ci Limited 2009
Affordable House Type 5 Mid Terrace - Barratt Code 3 Specification Commercial in Confidence -3- C4Ci Limited 2009
Affordable House Type 5 Mid Terrace - BesBlock Code 3 Specification Commercial in Confidence -4- C4Ci Limited 2009
Affordable House Type 6 End Terrace - Barratt Code 3 Specification Commercial in Confidence -5- C4Ci Limited 2009
Affordable House Type 6 End Terrace - BesBlock Code 3 Specification Commercial in Confidence -6- C4Ci Limited 2009
Affordable House Type 6 Mid Terrace - Barratt Code 3 Specification Commercial in Confidence -7- C4Ci Limited 2009
Affordable House Type 6 Mid Terrace - BesBlock Code 3 Specification Commercial in Confidence -8- C4Ci Limited 2009
CSH Assessment This section will follow the structure and format of the Code for Sustainable Homes Technical Guide October 2008. Summary of Environmental Categories and Issues Categories Issue Energy and CO2 emissions Ene1 - Dwelling emission rate (M) Ene2 - Building fabric Ene3 - Internal lighting Ene4 - Drying space Ene5 - Energy labelled white goods Ene6 - External lighting Ene7 - Low or zero carbon (LZC) technologies Ene8 - Cycle storage Ene9 - Home office Water Wat1 - Indoor water use (M) Wat2 - External water use Materials Mat1 - Environmental impact of materials (M) Mat2 - Responsible sourcing of materials basic building elements Mat3 - Responsible sourcing of materials finishing elements Surface Water Run-off Sur1 - Management of Surface Water Runoff from developments (M) Sur2 - Flood risk Waste Was1 - Storage of non-recyclable waste and recyclable household waste (M) Was2 - Construction waste management (M) Was3 - Composting Pollution Pol1 - Global warming potential (GWP) of insulants Pol2 - NOX emissions Health and Well-being Hea1 - Daylighting Hea2 - Sound insulation Hea3 - Private space Hea4 - Lifetime homes (M) Management Man1 - Home user guide Man2 - Considerate constructors scheme Man3 - Construction site impacts Man4 - Security Ecology Eco1 - Ecological value of site Eco2 - Ecological enhancement Eco3 - Protection of ecological features Eco4 - Change in ecological value of site Eco5 - Building footprint (M) denotes issues with mandatory elements. Commercial in Confidence -9- C4Ci Limited 2009
Summary of CSH Scores for HouseType 5 Issue Credits Achieved Points Potential Points Maximum Points Ene1 - Dwelling emission rate (M) 5 6.28 10.04 18.83 Ene2 - Building fabric 2 2.51 2.51 2.51 Ene3 - Internal lighting 0 0 2.51 2.51 Ene4 - Drying space 0 0 1.26 1.26 Ene5 - Energy labelled white goods 0 0 2.51 2.51 Ene6 - External lighting 2 2.51 2.51 2.51 Ene7 - Low or zero carbon (LZC) technologies 0 0 0 2.51 Ene8 - Cycle storage 0 0 2.51 2.51 Ene9 - Home office 0 0 0 1.26 Wat1 - Indoor water use (M) 3 4.5 7.5 7.50 Wat2 - External water use 0 0 1.5 1.50 Mat1 - Environmental impact of materials (M) 3 0.9 4.5 4.5 Mat2 - Responsible sourcing of materials basic building elements 0 0 1.8 1.8 Mat3 - Responsible sourcing of materials finishing elements 0 0 0.9 0.9 Sur1 - Management of Surface Water Runoff from developments (M) 0 0 1.1 1.1 Sur2 - Flood risk 0 0 1.1 1.1 Was1 - Storage of non-recyclable waste and recyclable household waste (M) 0 0 3.66 3.66 Was2 - Construction waste management (M) 0 0 1.83 1.83 Was3 - Composting 0 0 0.91 0.91 Pol1 - Global warming potential (GWP) of insulants 0 0 0.70 0.70 Pol2 - NOX emissions 0 0 2.1 2.1 Hea1 - Daylighting 1 1.167 1.167 3.50 Hea2 - Sound insulation 3 3.50 4.67 4.67 Hea3 - Private space 0 0 1.17 1.17 Hea4 - Lifetime homes (M) 0 0 4.67 4.67 Man1 - Home user guide 0 0 3.33 3.33 Man2 - Considerate constructors scheme 0 0 2.22 2.22 Man3 - Construction site impacts 0 0 2.22 2.22 Man4 - Security 0 0 2.22 2.22 Eco1 - Ecological value of site 0 0 1.33 1.33 Eco2 - Ecological enhancement 0 0 1.33 1.33 Eco3 - Protection of ecological features 0 0 1.33 1.33 Eco4 - Change in ecological value of site 0 0 5.33 5.33 Eco5 - Building footprint 0 0 0 2.67 19 21.37 82.47 100.00 Level 3 ( ) = 57 points Level 4 ( ) = 68 points Level 5 ( ) = 84 points Level 6 ( ) = 90 points Achieved points are limited to information currently available on drawings and specifications or mandatory minimum credits for CHS Level 3. Site specific credits are excluded. Potential points are limited to the physical dimensions of the house type and exclude credits that have not been sought, e.g. renewable energy Ene 7. Commercial in Confidence -10- C4Ci Limited 2009
Summary of CSH Scores for HouseType 6 Issue Achieved Potential Maximum Credits Points Points Points Ene1 - Dwelling emission rate (M) 5 6.28 10.04 18.83 Ene2 - Building fabric 2 2.51 2.51 2.51 Ene3 - Internal lighting 0 0 2.51 2.51 Ene4 - Drying space 0 0 1.26 1.26 Ene5 - Energy labelled white goods 0 0 2.51 2.51 Ene6 - External lighting 2 2.51 2.51 2.51 Ene7 - Low or zero carbon (LZC) technologies 0 0 0 2.51 Ene8 - Cycle storage 0 0 2.51 2.51 Ene9 - Home office 0 0 0 1.26 Wat1 - Indoor water use (M) 3 4.5 7.5 7.50 Wat2 - External water use 0 0 1.5 1.50 Mat1 - Environmental impact of materials (M) 3 0.9 4.5 4.5 Mat2 - Responsible sourcing of materials basic building elements 0 0 1.8 1.8 Mat3 - Responsible sourcing of materials finishing elements 0 0 0.9 0.9 Sur1 - Management of Surface Water Runoff from developments (M) 0 0 1.1 1.1 Sur2 - Flood risk 0 0 1.1 1.1 Was1 - Storage of non-recyclable waste and recyclable household waste (M) 0 0 3.66 3.66 Was2 - Construction waste management (M) 0 0 1.83 1.83 Was3 - Composting 0 0 0.91 0.91 Pol1 - Global warming potential (GWP) of insulants 0 0 0.70 0.70 Pol2 - NOX emissions 0 0 2.1 2.1 Hea1 - Daylighting 0 0 0 3.50 Hea2 - Sound insulation 3 3.50 4.67 4.67 Hea3 - Private space 0 0 1.17 1.17 Hea4 - Lifetime homes (M) 0 0 0 4.67 Man1 - Home user guide 0 0 3.33 3.33 Man2 - Considerate constructors scheme 0 0 2.22 2.22 Man3 - Construction site impacts 0 0 2.22 2.22 Man4 - Security 0 0 2.22 2.22 Eco1 - Ecological value of site 0 0 1.33 1.33 Eco2 - Ecological enhancement 0 0 1.33 1.33 Eco3 - Protection of ecological features 0 0 1.33 1.33 Eco4 - Change in ecological value of site 0 0 5.33 5.33 Eco5 - Building footprint 2 2.67 2.67 2.67 20 22.87 79.30 100.00 Level 3 ( ) = 57 points Level 4 ( ) = 68 points Level 5 ( ) = 84 points Level 6 ( ) = 90 points Achieved points are limited to information currently available on drawings and specifications or mandatory minimum credits for CHS Level 3. Site specific credits are excluded. Potential points are limited to the physical dimensions of the house type and exclude credits that have not been sought, e.g. renewable energy Ene 7. Commercial in Confidence -11- C4Ci Limited 2009
The following table includes comments relevant to the House Type performance with respect to the CSH. CSH Category House Type 5 House Type 6 Energy and CO 2 Both house types are capable of delivering Code Level 3 and 4 CO 2 emissions: Emissions level 3 without renewables, level 4 with solar thermal DHW or a heat pump system. Current drawings do not show enough CFL light fittings. Supplying Energy Efficient White Goods will increase the CSH points score. Home Office rooms must have 1.5% daylight factors, sufficient space and service sockets. Water It is possible for these house types to deliver Code Level 3 & 4 water consumption without resorting to grey water recycling or rainwater harvesting. Provision of Water Butts is an easy way to gain points. Materials Both House types can deliver maximum points in this category provided the supply chain briefed and monitored on responsible sourcing requirements. Surface Water Runoff Site specific points. Where possible use low flood risk sites. Always appoint a consultant/expert to advise on and implement SUDS drainage schemes. Waste Planning waste recycling effectively from the kitchen through to the local collection and recycling plants is a relatively easy way to gain points. If there is sufficient space supplying a composting unit with instructions will gain CSH points. Construction Waste: This can be incorporated as a condition of the supply contract. Pollution Global Warming: This focuses on ensuring all insulations are CFC free and have minimal or no global warming potential. This is a specification and supply chain issue. NOx Emissions: A lost cause where grid electricity is the primary heating fuel (including heat pumps). The impact of other fuels can be minimized to gain points through diligent specification in accordance with CSH guidelines. Health and wellbeing Daylighting: Both house types perform badly on this issue. This also prohibits scoring points for a home office. Sound Insulation: Besblock Party Wall RD E-WM-5 will score 3.5 points for these House types provided the site is registered with RDL Management Ecology Lifetime Homes: this house type can with very little modification meet all 16 requirements. Lifetime Homes: this house type has fundamental issues that prevent it from meeting all of the 16 requirements. Home User Guide: A good home user guide template can be used over and over again with appropriate edits for local services etc. Considerate constructors: A supply chain issue that is fairly easy to deliver. Construction Site Impacts: Strategies for monitoring, controlling and reducing site impacts. This can be incorporated as a condition of the supply contract. Security: Specification of secure by design windows and doors. Appointment of an ALO or a CPDA early on in the scheme. Where possible avoid greenfield sites and improve the local ecology. Appointment of a suitably qualified ecologist before any site clearance or construction work starts Building footprint: 2 storey = 0 points Building footprint: 3 storey = 2.67 points Commercial in Confidence -12- C4Ci Limited 2009