A guide to the Code for Sustainable Homes (Part Three)

Information on the Code for Sustainable Homes, and some helpful advice to aid you and your new build home in achieving Sustainability status.


Continued from A guide to the Code for Sustainable Homes (Part Two)

Aiming Higher – Achieving Levels 4, 5, and 6 of the Code for Sustainable Homes

Reaching Level 3 of the Code for Sustainable Homes means achieving a 25% (5.8 points) ‘dwelling emissions’ improvement on Building Regulations. However, Level 4 aims a 44% (9.4 points) improvement, whilst Levels 5 and 6 require a 100% (16.4 points) improvement and zero carbon (17.6 points).

An additional 18.8 points can be earned in the Energy category by taking other measures such as using 75% energy efficient lighting systems, a space for drying clothes, energy labelled white goods, a space which can be used as a  home office, and a bicycle storage space. As far as water consumption is concerned, Levels 5 and 6 both require that only 80 litres is used per person per day (7.5 points) as opposed to the 105 litres per person per day required to achieve Levels 3 and 4 (4.5 points). Even though the Energy and Water sections of the Code for Sustainable Homes are set with Mandatory levels for achieving higher ratings, the rest is able to be earned through a variety of other categories. For example, a further maximum 14 points can be earned quite easily through the Health and Well-being category.

You can find a full guide of where points can be earned at www.communities.gov..uk.

Level 6 of the Code for Sustainable Homes is likely to be built into the new national Building Regulations in England and Wales by 2016.

Building Regulations and CSH3

The Energy Saving Trust has put together a series of scenarios for home builders to save up to 25% in energy and carbon emissions against Building Regulations. The guidelines are calculated for a typical 104 square metre detached property, and are as follows:

Building regulations CSH3
Roof U-value* 0.25 0.13
Walls U-value 0.30 0.25
Exposed floors U-value 0.25 0.20
Windows U-value 2.10 1.20
Doors U-value 2.20 1.00
Y-value* 0.08 0.04
Airtightness m³/(hr.m²) 7.0 3.0
Mechanical ventilation Extractor fans MVHR 85% efficiency
Low-energy lighting 30% 75%
CO² DER (Dwelling Emission Rate) 23.22 17.59


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