Code for Sustainable Homes

The Code for Sustainable Homes lists a series of environmental impacts and issues under the nine design categories.

Nine design categories for the Code for Sustainable Homes

The Code for Sustainable Homes is an environmental assessment rating method which:

• identifies a set of issues which are known to impact on the environment

• establishes performance measures which:

    – are known to reduce environmental impacts

    – exceed the requirements of legislation and regulations

    – can be objectively assessed, evaluated and delivered in a practical and cost effective way by the construction industry;

• identifies environmental issues for which mandatory minimum performance must be achieved in order to gain a Code rating;

• assesses environmental performance in a two stage process (Design stage and Post construction) using objective criteria and verification;

• records results of the Code assessment on a certificate assigned to the dwelling.

How is the sustainability of a house rated under the Code for Sustainable Homes?

The sustainability rating which a home achieves represents its overall performance across the nine Code design categories.

Minimum standards exist for a number of categories. These must be achieved to gain a one star(*) sustainability rating. Energy efficiency and water efficiency categories also have minimum standards that must be achieved at every level of the Code, recognising their importance to the sustainability of any home. Apart from these minimum requirements, the Code for Sustainable Homes is completely flexible; developers can choose which and how many standards they implement to obtain credits under the Code in order to achieve a higher sustainability rating.

The Code for Sustainable Homes uses a sustainability rating system indicated by stars

to communicate the overall sustainability performance of a home. A home can achieve a sustainability rating from one(*) to six(******) stars depending on the extent to which it has achieved Code standards. One star(*) is the entry level above the level of the Building Regulations; and six stars(******) is the highest level reflecting exemplar development in sustainability terms.

What are the key issues in the Category 3– Materials element of the CSH?

The aim of this design element is to encourage the use of materials with lower environmental impact spread over the lifecycle of the building.

Credits are awarded where an assessment is made of the number of credits awarded in at least three of the five key elements which achieve a relevant BRE Green Guide rating of A+ to E (roof; external walls; internal walls; upper and ground floors and windows). Between 1 and 15 credits can be achieved, depending on the Green Guide rating – the higher the rating the lowest overall environmental impact.

Code for sustainable homes applications

This category also recognises and encourages the specification of responsibly sourced materials for the basic building elements. Points are awarded where materials used in the key building elements below.

They represent 80% of the total assessed materials. Credits are also awarded for responsibly sourced materials used in the finishing elements of the building.

What are the maximum points available for the roofing and wall elements within the CSH?

The total number of points available for the Materials category is 24 which accounts for 7.20% weighting of the maximum number of credits available. The Environmental Impact of Materials accounts for a maximum of 15 points with Responsible Sourcing of Materials – (basic building elements). Using the generic 'Green Guide' A+ rating for concrete tiles, fibre cement slates and clay tiles, a maximum of 3 credits is achievable for a conventional pitched roof, using 100mm mineral wool between joists with a further 200mm over joists. Choosing products which achieve a lower rating, will reduce the credits awarded A+ = 3 points; A rating = 2 points; B rating =1 point; C, D or E = 0 points.

Our range of concrete and clay tiles, fibre cement slates, profiled sheets and fibre cement cladding can achieve an A+ rating in the BRE ‘Green Guide’, and as such provide the maximum number of credits available for the roof and walls when using the calculation methodology in the CSH. In addition all of our UK manufactured clay, concrete and fibre cement roofing products are assessed under BES 6001 responsible sourcing and qualify for an additional 2 points.

Code for Sustainable Homes points system
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