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Code for Sustainable Homes - Level 5

SWEL were approached by a firm of architects who were themselves project managers for a large multi unit development in London. The project built on a brown field site was expected to achieve Code for Sustainable Homes Level 5.

With a DER of 0 kg/CO2/m2 the new development employed combined heat and power plus photovoltaic cells. Very high fabric energy efficiency was employed at ever stage with very large thicknesses of high performance insulants. Details of the project scoring can be found below.

2.1       Energy and Carbon

2.1.1    Dwelling Emission Rate

The modelled[1] 3 bedroom apartment will achieve a dwelling emission rate of -1.36 kg/sq.m. That is to say a 100% reduction in line with CSH Level 5. Calculations are provided in Appendix 2.

Issue ID

Description

Max Credits

Project Credits

Ene 1

DER

10

9

 

2.1.2    Fabric Energy Efficiency

To make the best use of energy gains the building envelope will have very high efficiency. The project demonstrates a modeled fabric energy efficiency of ≤36.7 kWh/m2/year. Calculations are displayed in Appendix 2.

Issue ID

Description

Max Credits

Project Credits

Ene 2

Fabric Energy Efficiency

9

7

 

2.1.3    Assessment Criteria

2.1.4    Energy Display Devices

In order to understand energy consumption, occupants should be able to observe and monitor energy usage. Electricity consumption data will displayed to occupants by a correctly specified energy display device. The community heating scheme will make reporting of primary heating consumption difficult to achieve.

Issue ID

Description

Max Credits

Project Credits

Ene 3

Energy Display Devices

2

1

2.1.5    Drying Space

If drying space is not provided residents may use radiators for drying clothing etc. This lowers the efficiency of the heating system and as such adequate drying space should be provided. 2 meters of drying line will be provided per Bedroom.

Issue ID

Description

Max Credits

Project Credits

Ene 4

Drying Space

1

1

2.1.6    Energy Labelled White Goods

“A” rated washing machines and A+ rated fridges and freezers are to be provided.

Issue ID

Description

Max Credits

Project Credits

Ene 5

White Goods

2

2

2.1.7    External Lighting

All external and communal areas are to be fitted with low energy lighting.

Issue ID

Description

Max Credits

Project Credits

Ene 6

External Lighting

2

2

2.1.8    Low and Zero Carbon Technologies

The project incorporates photovoltaic and combined heat and power for space heating and domestic hot water supply.

Issue ID

Description

Max Credits

Project Credits

Ene 7

Low Carbon Technologies

2

2

2.1.9    Cycle Storage

Encouraging the uses of cycles promotes better health and lowers travel related carbon emissions.

Issue ID

Description

Max Credits

Project Credits

Ene 8

Cycle Storage

2

2

2.1.10  Home Office

Adequate space will be provided that receives an average daylighting factor of 1.5% in line with BRE guide BR 209[2].

Issue ID

Description

Max Credits

Project Credits

Ene 9

Home Office

1

1

2.2       Water

2.2.1    Indoor Water Use

Indoor Water use will be limited to <80 litres per resident per day. Water usage calculations are shown in Appendix 3.

Issue ID

Description

Max Credits

Project Credits

Wat 1

Indoor Water Use

5

5

 2.2.2    External Water Use

Attenuation rates are bettered post development, and it is not thought a rain water harvesting system is required.

 

Issue ID

Description

Max Credits

Project Credits

Wat 2

External Water Use

1

0

2.3       Materials

2.3.1    Environmental Impact of Materials

At least three of the following five key elements of the building envelope will achieve a rating of A+ to D in the 2008 version of The Green Guide: 

·         Roof 

·         External walls 

·         Internal walls (including separating walls) 

·         Upper and ground floors (including separating floors) 

·         Window

Issue ID

Description

Max Credits

Project Credits

Mat 1

Environmental Impact of Materials

15

15

2.3.2    Responsible Sourcing of Materials – Fabric

80% of the assessed materials in the following Building Elements will be responsibly sourced: 

·         Frame 

·         Ground floor 

·         Upper floors (including separating floors) 

·         Roof 

·         External walls 

·         Internal walls (including separating walls) 

·         Foundation/substructure (excluding sub-base materials)

·         Staircase 

Additionally, 100% of any timber in these elements will be legally sourced. E.g. FSC Wood.

Issue ID

Description

Max Credits

Project Credits

Mat 2

Responsible Sourcing of Materials – 

Basic Building Element

6

4

2.3.3    Responsible Sourcing of Materials – Finish

80% of the assessed materials in the following Building Elements will be responsibly sourced: 

·         Frame 

·         Ground floor 

·         Upper floors (including separating floors) 

·         Roof 

·         External walls 

·         Internal walls (including separating walls) 

·         Foundation/substructure (excluding sub-base materials)

·         Staircase 

Additionally, 100% of any timber in these elements will be legally sourced. E.g. FSC Wood.

Issue ID

Description

Max Credits

Project Credits

Mat 2

Responsible Sourcing of Materials – 

Finishing Elements

3

2

2.4       Surface Water Run-off

2.4.1    Surface Water Run-off Management

Pre-development run-off rates are to be bettered, as per details in report S13-095 SS.

Issue ID

Description

Max Credits

Project Credits

Sur 1

Management of Surface Water  

Run-off from Developments

2

2

2.4.2    Flood Risk

Project is situated wholly within flood zone 1.

Issue ID

Description

Max Credits

Project Credits

Sur 2

Flood Risk

2

2

2.5       Waste

2.5.1    Storage of Non-recyclable / Recyclable Wastes

In line with BS 5906:2005, 30 Litres of dedicated Internal Storage for 3 number bins no less than 7 litres in volume.

For flats, a private recycling scheme operator will be appointed to maintain bins and collect recyclable waste regularly. Recycling containers will:

·         Be located in an adequate external space

·         Be sized according to the frequency of collection, based on guidance from the recycling scheme operator

·         Store at least three types of recyclable waste in identifiably different bins

Issue ID

Description

Max Credits

Project Credits

Was 1

Storage of Non-recyclable Waste and 

Recyclable Household Waste

4

4

2.5.2    Construction Site Waste Management

There will be a compliant Site Waste Management Plan (SWMP) that contains:

·         Target benchmarks for resource efficiency, i.e. m3 of waste per 100 m2or tonnes of waste per 100 m2 set in accordance with best practice 

·         Procedures and commitments to minimize non-hazardous construction waste at design stage. Specify waste minimisation actions relating to at least 3 waste groups and support them by appropriate monitoring of waste.

·         Procedures for minimising hazardous waste

·         Monitoring, measuring and reporting of hazardous and non-hazardous site waste production according to the defined waste groups (according to the waste streams generated by the scope of the works)

Issue ID

Description

Max Credits

Project Credits

Was 2

Construction Site Waste Management

3

1

2.5.3    Composting

Islington Borough Council operates a composting scheme. Bins will be provided for adequate segregation of bio degradable waste as per 2.5.1.

Issue ID

Description

Max Credits

Project Credits

Was 3

Composting

1

1

2.6       Pollution

2.6.1    Global Warming Potential of Insulants

In line with BRE guide FB27[3] appropriate insulation will be chosen that has a GWP <5. This should be utilised in all main elements of construction.

Issue ID

Description

Max Credits

Project Credits

Pol 1

Global Warming Potential (GWP) of Insulants

1

1

2.6.2    NOx Emissions

The prosed gas turbine CHP system will have a NOx emissions of 1.1 g/KWh[4].

Issue ID

Description

Max Credits

Project Credits

Pol 2

NOX Emissions

3

3

2.7       Health & Wellbeing

2.7.1    Daylighting

Kitchens will achieve a minimum Average Daylight Factor of at least 2%. All living rooms, dining rooms and studies (including any room designated as a home office under Ene 9 – Home Office) will achieve a minimum Average Daylight Factor of at least 1.5% inline with BRE guide BR 209[5].

Issue ID

Description

Max Credits

Project Credits

Hea 1

Daylighting

3

2

2.7.2    Sound Insulation

Airborne sound insulation values will be at least 3dB higher. Impact sound insulation values are at least 3dB lower.

Issue ID

Description

Max Credits

Project Credits

Hea 2

Sound Insulation

4

1

2.7.3    Private Space

Winter gardens provide external spaces that is;

·         Of a minimum size that allows all occupants to use the space. 

·         Provided with inclusive access and usability

·         Accessible only to occupants of designated dwellings

Issue ID

Description

Max Credits

Project Credits

Hea 3

Private Space

1

1

2.7.4    Lifetime Homes

Issue ID

Description

Max Credits

Project Credits

Hea 4

Lifetime Homes

4

4

The project will meet all principals of Lifetime Homes.

2.8       Management

2.8.1    Home User Guide

Provision of a Home User Guide, compiled in accordance with Checklist Man 1[6], Part 1, together with confirmation that the guide is available in alternative formats.

Issue ID

Description

Max Credits

Project Credits

Man 1

Home User Guide

3

2

2.8.2    Considerate Constructors Scheme

There will be a commitment to meet best practice under a nationally or locally recognised certification scheme such as the Considerate Constructors Scheme.

Issue ID

Description

Max Credits

Project Credits

Man 2

Considerate Constructors Scheme

2

1

 

2.8.3    Construction Site Impacts

Obtaining points from the following may be possible depending on principal contractors reporting methods.

Issue ID

Description

Max Credits

Project Credits

Man 3

Construction

Site Impacts

2

0

 

 

2.8.3    Security

An Architectural Liaison Officer (ALO) or Crime Prevention Design Advisor (CPDA) from the local police force will be consulted at the design stage and their recommendations are incorporated into the design of the dwelling

Issue ID

Description

Max Credits

Project Credits

Man 4

Security

2

2

 

2.9       Ecology

2.9.1    Ecological Value of the Site

The development site is confirmed as land of inherently low ecological value.

Issue ID

Description

Max Credits

Project Credits

Eco 1

Ecological

Value of the Site

1

1

 

2.9.2    Ecological Enhancement

A suitably qualified ecologist will be appointed to recommend appropriate ecological features that will positively enhance the ecology of the site. The developer will adopt all key recommendations and 30% of additional recommendations.

Issue ID

Description

Max Credits

Project Credits

Eco 2

Ecological Enhancement

1

1



[1] SAPPER V9 – Reginald James Architects (BRE Approved Software)

[2] Br 209 – Site Layout Planning for Daylight and Sunlight – Second Edition

[3] FB 27 – Environmental Impact of Insulation – BRE 2011

[4] Guide to minimising the local air quality impact of Combined Heat and Power Plant in the City of London

[5] Br 209 – Site Layout Planning for Daylight and Sunlight – Second Edition

[6] CSH Tech Guide – Page 215

 

 

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