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United Kingdom Rainwater Harvesting Awareness

The Code For Sustainable Homes (CfSH)
This section of the website deals with the associated aspects of the code for sustainable homes and it's impact upon all aspects of rainwater harvesting, grey water harvesting and stormwater management.

What Is the Code for
Sustainable Homes?

A NEW NATIONAL STANDARD
The Code for Sustainable Homes has been developed to enable a step
change in sustainable building practice for new homes. It has been prepared
by the Government in close working consultation with the Building Research
Establishment (BRE) and Construction Industry Research and Information
Association (CIRIA), and through consultation with a Senior Steering Group
consisting of Government, industry and NGO representatives.
The Code is intended as a single national standard to guide industry in the
design and construction of sustainable homes. It is a means of driving
continuous improvement, greater innovation and exemplary achievement
in sustainable home building.
The Code will complement the system of Energy Performance Certificates
which is being introduced in June 2007 under the Energy Performance of
Buildings Directive (EPBD). The EPBD will require that all new homes (and
in due course other homes, when they are sold or leased) have an Energy
Performance Certificate providing key information about the energy efficiency/
carbon performance of the home. Energy assessment under the Code will use
the same calculation methodology therefore avoiding the need for duplication.
In the short-term, Code compliance is voluntary but home builders are
encouraged to follow Code principles set out in this publication because
the Government is considering making assessment under Code standards
mandatory in the future.

A SET OF SUSTAINABLE DESIGN PRINCIPLES
The Code measures the sustainability of a home against design categories,
rating the ‘whole home’ as a complete package. Those familiar with building
regulations, will recognise this as a major and welcome departure from
current practice.
The design categories included within the Code are:
? energy/CO2
? pollution
? water ? health and well-being
? materials ? management
? surface water run-off ? ecology
? waste
A STANDARD WHICH BUILDS UPON EXISTING SYSTEMS
The Code for Sustainable Homes has been developed using the Building
Research Establishment’s (BRE) EcoHomes System, which has already
achieved success in reducing the impact of affordable housing projects, in
particular within the social housing sector.
The Code builds upon EcoHomes in a number of ways, for example:
? the Code introduces minimum standards for energy and water efficiency
at every level of the Code, therefore requiring high levels of sustainability
performance in these areas for achievement of a high Code rating;
? the Code uses a simpler system of awarding points, with more complex
weightings removed;
? the Code includes new areas of sustainability design, such as Lifetime
Homes and inclusion of composting facilities;
BRE will continue to maintain and operate the EcoHomes scheme during the
transition to the Code. The Code sits alongside the planning system which
guides sustainability in broader locational and aesthetic issues.
A MARK OF QUALITY
In this era, with a more environmentally-conscious public, aware of the
urgent need to limit their effects on climate change, there is a growing
appetite amongst consumers for more sustainable products and services. With
greater demand for homes that offer reduced environmental impact, lower
running costs and features that enhance health and well-being, there is an
increased need for home builders to demonstrate their capacity in sustainable
home building, and to market the sustainability of their homes to
homebuyers. The Code for Sustainable Homes offers a tool for home
builders to demonstrate the sustainability performance of their homes, and to
differentiate themselves from their competitors.
A SIGNAL FOR THE FUTURE
The Code is closely linked to Building Regulations, which are the minimum
building standards required by law. Minimum standards for Code compliance
have been set above the requirements of Building Regulations. It is intended
that the Code will signal the future direction of Building Regulations in
relation to carbon emissions from, and energy use in homes, providing
greater regulatory certainty for the homebuilding industry.
How Does the Code Work?
THE SUSTAINABILITY RATING SYSTEM
The Code 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.
ACHIEVING A SUSTAINABILITY RATING
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 is completely flexible;
developers can choose which and how many standards they implement to
obtain ‘points’ under the Code in order to achieve a higher sustainability rating.
The table below shows the nine design categories and the degree of
flexibility afforded by each:
So, in order to achieve a particular code level and the associated sustainability
rating, a home must integrate minimum standards, and additional points for
other design features must be attained.
Flexibility of the Code
Categories Flexibility
Energy/CO2 Minimum standards at each level of the Code
Water
Materials Minimum standard at Code entry level
Surface water run-off
Waste
Pollution No minimum standards
Health and well-being
Management
Ecology
The table below shows the minimum standards, and number of points
required in order to achieve each level of the Code:
ASSESSING THE SUSTAINABILITY RATING
Assessment procedures will be transparent and technically rigorous, whilst
at the same time straightforward and beneficial to all parties.
The method will be similar to BRE’s EcoHomes System which depends on
a network of specifically trained and accredited independent assessors. BRE
will retrain and accredit assessors for the new Code. Code assessors will
conduct initial design stage assessments, recommend a sustainability rating,
and issue an interim Code certificate. They will perform a post-completion
check to verify the rating before a final Code certificate of compliance is issued.
A design stage assessment will only need to be carried out on each home
type within any development – not every single home. Post-completion
checks will be carried out on a sample basis.
Builders whose home designs and completed work are assessed under the
Code will receive a certificate showing the overall sustainability rating for
the home, and a breakdown of how that rating has been achieved.
a sustainability rating
Minimum Standards
Energy Water
Code Level Standard Points Standard Points Other
(Percentage Awarded (litres per Awarded Points4
better than person Required
Part L1 2006) per day)
1(?) 10 1.2 120 1.5 33.3
2(??) 18 3.5 120 1.5 43.0
3(???) 25 5.8 105 4.5 46.7
4(????) 44 9.4 105 4.5 54.1
5(?????) 1002 16.4 80 7.5 60.1
6(??????) A zero 17.6 80 7.5 64.9
carbon
home3
Notes
1. Building Regulations: Approved Document L (2006) – ‘Conservation of Fuel
and Power.’
2. Zero emissions in relation to Building Regulations issues (i.e. zero emissions
from heating, hot water, ventilation and lighting).
3. A completely zero carbon home (i.e. zero net emissions of carbon dioxide (CO2)
from all energy use in the home).
4. All points in this document are rounded to one decimal place.
Summary of Code benefits
BENEFITS FOR THE ENVIRONMENT
? Reduced greenhouse gas emissions: With minimum standards for
energy efficiency at each level of the Code, there will be a reduction
in greenhouse gas emissions to the environment. This will enable us
to reduce the threat from climate change.
? Better adaptation to climate change: The Building Regulations
(Approved Document L – 2006) already limit the effects of solar gains
in Summer. With minimum standards for water efficiency at each level of
the Code, and other measures in the Code, including better management
of surface water run-off, our future housing stock will be better adapted
to cope with the impacts of climate change which are already inevitable.
? Reduced impact on the environment overall: Inclusion of measures
which, for example, promote the use of less polluting materials, and
encourage household recycling, will ensure that our future housing stock
has fewer negative impacts overall on the environment.
BENEFITS FOR HOME BUILDERS
? A mark of quality: Increasing media attention and public concern over
environmental issues, notably climate change, has given rise to a growing
appetite among consumers for more sustainable products and services.
The Code for Sustainable Homes can be used by home builders to
demonstrate the sustainability performance of their homes, and to
differentiate themselves from their competitors.
? Regulatory certainty: The levels of performance for energy efficiency
indicate the future direction of building regulations, bringing greater
regulatory certainty for home builders, and acting as a guide to support
effective business and investment planning.
? Flexibility: The Code is based on performance which means it sets
levels for sustainability performance against each element but does not
prescribe how to achieve each level. Home builders can innovate to find
cost-effective solutions to meet and exceed minimum requirements.
Code for Sustainable Homes
8
BENEFITS FOR SOCIAL HOUSING PROVIDERS
? Lower running costs: Homes built to Code standard will have lower
running costs through greater energy and water efficiency than homes
not built to the Code standard, so helping to reduce fuel poverty.
? Improved comfort and satisfaction: Homes built to the Code will
enhance the comfort and satisfaction of tenants. Costs may be saved in
dealing with complaints.
? Raised sustainability credentials: The Code will enable social housing
providers to demonstrate their sustainability credentials to the public,
tenants and funding bodies.
BENEFITS FOR CONSUMERS
? Assisting choice: The Code will provide valuable information to
homebuyers on the sustainability performance of different homes,
assisting them in their choice of a new home.
? Reducing environmental ‘footprint’: By asking for a new home which
meets the Code standard, consumers will be able to encourage industry
to build more sustainable homes, and reduce their own ‘footprint’ on the
environment.
? Lower running costs: Homes built to Code standard will have lower
running costs through greater energy and water efficiency than homes
not built to the Code standard, so helping to reduce fuel poverty.
? Improved well-being: Homes built to Code standard will provide a
more pleasant and healthy place to live, for example with more natural
light, and adaptability for future needs.
Code standards
This section lists the issues under each of the sustainability categories
included within the Code, the minimum standards where applicable,
and the points available for each issue.
SUMMARY OF MINIMUM STANDARDS
The table below summarises all of the minimum standards which exist
under the Code:
† A probable future development regarding the environmental impact of materials is to reward
resource efficiency, as well as the use of resources that are more sustainable, by developing
‘Ecopoints per m2’ as a measure for this item. However, it may be that the ‘Green Guide’
route will remain as a simple route for smaller developments.
Minimum standards
Code Level Category Minimum Standard
Energy/CO2
1(?) Percentage improvement over 10%
2(??) Target Emission Rate (TER) 18%
3(???) as determined by the 25%
4(????) 2006 Building Regulation 44%
5(?????) Standards 100%
6(??????) A ‘zero carbon home’
(heating, lighting, hot water
and all other energy uses in
the home)
Water
1(?) Internal potable water 120 l/p/d
2(??) consumption measured in 120 l/p/d
3(???) litres per person per day (l/p/d) 105 l/p/d
4(????) 105 l/p/d
5(?????) 80 l/p/d
6(??????) 80 l/p/d
Materials
1(?) Environmental impact At least three of the following
of materials† 5 key element of construction
are specified to achieve a BRE
Green Guide 2006 rating of at
least D
– Roof structure and finishes
– External walls
– Upper floor
– Internal walls
– Windows and doors
Surface Water Run-off
1(?) Surface water management Ensure that peak run-off rates
and annual volumes of run-off
will be no greater than the
previous conditions for the
development site
Minimum standards (continued)
Code Level Category Minimum Standard
Waste
1(?) Site waste management Ensure there is a site waste
management plan in
operation which requires the
monitoring of waste on site
and the setting of targets to
promote resource efficiency
Household waste storage Where there is adequate
space for the containment
of waste storage for each
dwelling. This should allow
for the greater (by volume)
of the following
EITHER
accommodation of all
external containers provided
under the relevant Local
Authority refuse
collection/recycling scheme.
Containers should not be
stacked to facilitate ease of
use. They should also be
accessible to disabled people,
particularly wheelchair users
and those with
a mobility impairment
OR
at least 0.8m3 per dwelling
for waste management as
required by BS 5906 (Code
of Practice for Storage and
On-site Treatment of Solid
Waste from Buildings)
DETAILED POINTS SCORING SYSTEM
Category 1 – Energy/CO2
Issue Measurement Criteria Points Awarded
Target Emission Points for percentage improvement One of the following
Rate (TER) as over Building Regulations Approved Point scores
defined by 2006 Document L (2006) – Conservation of
Building Fuel & Power; calculated using
Regulation SAP:2005
Standards
10% 1.2
14% 2.4
18% 3.5
22% 4.7
25% 5.8
31% 7.0
37% 8.2
44% 9.4
52% 10.5
60% 11.7
69% 12.9
79% 14.0
89% 15.2
100% 16.4
a ‘zero carbon home‘ 17.6
Building fabric Heat Loss Parameter (HLP)
EITHER EITHER
1.3 1.2
OR OR
1.1 2.4
Internal lighting Where the following percentage
of fixed fittings are dedicated
energy efficient fittings
EITHER EITHER
40% of fittings 1.2
OR OR
75% of fittings 2.4
Other Energy
Drying space For providing space and posts, 1.2
footings and fixings for drying
clothes in a secure environment
for each unit on the site
Category 1 – Energy/CO2 (continued)
Issue Measurement Criteria Points Awarded
Ecolabelled EITHER EITHER
white goods Where fridges, freezers and 1.2
fridge/freezers have an A+ rating
under EU Energy Efficiency
Labelling Scheme
AND OPTIONALLY AND OPTIONALLY
Where washing machines +1.2
and dishwashers have an
A rating and/or washer driers
and tumble driers have a
B rating under EU Energy
Efficiency Labelling Scheme
OR OR
Information is provided on 1.2
purchasing and benefits of
efficient white goods, where
such goods are not supplied
with the new home
External lighting Where all space lighting is 1.2
provided by dedicated
energy efficient fittings,
taking into account the needs
of people who have visual
impairments
AND OPTIONALLY AND OPTIONALLY
Where all burglar security +2.4
lighting is:
• A maximum of 150W
• Fitted with movement detecting
and daylight shut-off devices
Where all other security lighting
is provided with energy efficient
fittings and daylight shut-off
devices
Category 1 – Energy/CO2 (continued)
Issue Measurement Criteria Points Awarded
Low or Zero EITHER EITHER
Carbon Energy Where at least 10% of total 1.2
Technologies energy demand is supplied from
local renewable or low carbon
energy sources
OR OR
Where at least 15% of total 2.4
energy demand is supplied from
local renewable or low carbon
energy sources
Cycle storage Where provision is made for the
safe, weather-proof and secure
storage of cycles as follows:
• 1 and 2 bedroom dwellings
– storage for 1 cycle
• 3 bed dwellings
– storage for 2 cycles
• 4 bed dwellings and larger
– storage for 4 cycles
EITHER EITHER
In 50% or more of dwellings 1.2
in a development
OR OR
In 95% or more of dwellings 2.4
in a development
Home office For the provision of a space and 1.2
services which allows the
occupants to set up a
home office in a quiet room
Code Standards
15
Category 2 – Water
Issue Measurement Criteria Points Awarded
Internal Where predicted water One of the following
potable water consumption (calculated using point scores
consumption the Code water calculator)
accords with the following levels:
120 l/p/d 1.5
110 l/p/d 3
105 l/p/d 4.5
90 l/p/d 6
80 l/p/d 7.5
External For providing a system to collect 1.5
potable water rain water for use in external
consumption irrigation/watering e.g. water butts
Category 3 – Materials
Issue Measurement Criteria Points Awarded
Environmental Where the total building points One of the following
impact of achieved under the CSH point scores
materials materials calculator is as follows:
• Score of at least 3 points 0.9
• Score of at least 6 points 1.8
• Score of at least 9 points 2.7
• Score of at least 12 points 3.6
• Score of 15 points 4.5
Scores are achieved as follows
for each of the specifications:
• A+ rating = 3
• A rating = 2
• B rating = 1
• C, D or E = 0
Scores achieved for each of the
following elements are added
to give the total building score:
• Roof
• External Walls
• Internal Walls (incl. party walls
and partitions)
• Floors – upper and
ground floors
• Windows
Responsible Where materials used in key Between 0.3 points
sourcing of building elements are and 1.8 points (for
materials – responsibly sourced details see Technical
basic elements (e.g. timber certification, Guidance Manual)
EMS etc.)
Responsible Where materials used in Between 0.3 Points
sourcing of secondary building and finishing and 0.9 Points (for
materials – elements are responsibly sourced details see Technical
finishing elements (e.g. timber certification, EMS etc.) Guidance Manual)
Category 4 – Surface Water Run-off
Issue Measurement Criteria Points Awarded
Reduction of Where rainwater holding facilities/
surface water sustainable drainage (SUD) is used
run-off from site to provide attenuation of water
run-off to either natural water
courses or municipal systems.
Points for attenuation covering
• Hard surfaces 0.5
AND OPTIONALLY AND OPTIONALLY
• Roofs +0.5
The percentage peak time
attenuation should be provided
as follows
• 50% in low flooding risk areas
• 75% in medium flooding risk areas
• 100% in high flooding risk areas
Flood risk Where evidence is provided to
demonstrate that the assessed
development is located in an area of
EITHER EITHER
• low annual probability of flooding 1
OR OR
• medium/high annual probability 0.5
of flooding (subject to plans being
approved by the relevant statutory
bodies) and where
• the ground level of buildings, car
parks and access routes are above
the flood level;
• an appropriate assessment of how
the building will react to flooding
(including the use of resilient
construction where necessary)
to mitigate residual risk
Category 5 – Waste
Issue Measurement Criteria Points Awarded
Household EITHER EITHER
recycling facilities Where the following recycling 1.8
facilities are provided:
• 3 internal storage bins for
recyclable waste with
– min total capacity of 60ltr
– no individual bin
smaller than 15ltr
– all bins in a dedicated
position that is accessible
to disabled people
OR OR
Where full recycling facilities 3.6
are provided:
• 3 internal storage bins with
– min total capacity of 30ltr
– no individual bin smaller
than 7ltr
– all bins in a dedicated
position that is accessible
to disabled people
AND EITHER
• A Local Authority collection
scheme for recyclable materials
covering at least three streams
of waste with sufficient space
for the storage of the bins provided
without stacking (within 10m of
an external door) and which is
accessible to disabled people
OR
• Where there is not a Local
Authority collection scheme for
recyclable materials, 3 external
bins with:
– min total capacity of 180ltr
– no individual bin smaller than 40ltr
• All bins to be in a dedicated
position (within 10m of an external
door), which is accessible to
disabled people
Category 5 – Waste (continued)
Issue Measurement Criteria Points Awarded
Construction EITHER EITHER
waste Where the site waste management 0.9
plan includes procedures and
commitments that minimise waste
generated on site in accordance
with WRAP/Envirowise guidance
OR OR
Where the above is achieved and 1.8
the plan includes procedures and
commitments to sort, reuse and
recycle construction waste either
on site or through a licensed
external contractor
Composting Where home composting facilities 0.9
facilities are provided in houses with
gardens or a communal/community
composting service provided in
other dwelling types suitable
for normal domestic non-woody
garden, food and other
compostable household wastes.
Account should be taken concerning
the accessibility of these facilities
to disabled people
Category 6 – Pollution
Issue Measurement Criteria Points Awarded
Global warming Where all insulating materials 0.5
potential (GWP) avoid the use of substances that
of insulant have a global warming potential
(GWP) of 5 or more (and an
Ozone Depleting Potential of zero)
in either their manufacture or
composition for the following
elements
• Roof (including loft access)
• Walls internal and external
(including doors, lintels and
all acoustics insulation)
• Floor (including foundations)
• Hot water cylinder, pipe
insulation and other thermal
stores
Nitrous Oxide Where NOx emissions from any Between 0.5 points
(NOx) emissions space heating and hot water and 2 points (for
systems accord with the following details see Technical
Guidance Manual)
EITHER
• Dry NOx level <=100mg/KWh
OR
• Boiler class 4 under BS EN 297:1994
Code Standards
21
Category 7 – Health and well-being
Issue Measurement Criteria Points Awarded
Daylight Homes must meet the following Up to 4 points
standards before points can be (for details see
awarded: Technical Guidance
• Kitchen to achieve minimum Manual)
average daylight factor of at
least 2%
• Living rooms, dining rooms and
studies to achieve a minimum
average daylight factor of at
least 1.5%
• Kitchens, living rooms, dining
rooms and studies to be designed
to have a view of the sky
Sound insulation Points are awarded for achieving Between 1 and 4
higher standards of sound points (for details see
insulation than required by Part E Technical Guidance
of the Building Regulations, and Manual)
demonstrating it by either using
post-completion testing (PCT) or
Robust Details (RD)
Private space For the provision of outside space 1
that is at least partially private, and
that is accessible to disabled people
Lifetime Homes Where all the standards of Lifetime 4
Homes have been complied with,
that is:
• access to the dwelling
(Standards 1-5);
• general standards of accessibility
within the dwelling
(Standards 6-7, 11, 14, 15 and 16);
• potential future adaptability of
the dwelling
(Standards 8, 9, 10, 12 and 13)
Category 8 – Management
Issue Measurement Criteria Points Awarded
Home user guide Where there is provision in each 2.2
home of a simple user guide
that covers information relevant
to the ‘non-technical’ tenant/
occupant on the operation and
environmental performance of
their home, together with
information that the user guide
is available in alternative
accessible formats
AND OPTIONALLY AND OPTIONALLY
Where the guide also covers +1.1
information relating to the site
and its surroundings
Considerate EITHER EITHER
Constructors Where there is a commitment 1.1
Scheme to comply with best practice site
management principles and a
regular audit under a nationally
or locally recognised independent
certification scheme such as or
comparable to the Considerate
Contractors Scheme
OR OR
Where the commitment is to 2.2
go significantly beyond best
practice including a regular
audit under a nationally or
locally recognised independent
certification scheme such as, or
comparable to, the Considerate
Contractors Scheme
Category 8 – Management (continued)
Issue Measurement Criteria Points Awarded
Construction EITHER EITHER
site impacts Where there is a commitment 1.1
and strategy to operate site
management procedures on site
that cover 2 or more of the
following items:
• CO2 or energy arising from
site activities
• CO2 arising from transport to
and from site
• Water consumption arising
from site activities
• Best practice air pollution
controls
• Best practice water pollution
controls
• 80% of site timber is reclaimed,
reused or responsibly sourced
OR OR
Where there is a commitment 2.2
as above that covers 4 or more
of the items listed
Security Points are achieved by 2.2
complying with ‘Secured by
Design – New Homes’ (Section 2:
Physical Security). This will
include working closely with an
Architectural Liaison Officer or
Crime Prevention Design Advisor
from the local Police Force
Category 9 – Ecology
Issue Measurement Criteria Points Awarded
Ecological value Where development land is of 1.2
of the site low ecological value as defined
by either
• The BRE Ecological Value Checklist
OR
• A report prepared by a suitably
qualified ecologist
OR
Where a suitably qualified
ecologist confirms that the
site will remain undisturbed by
the works
Ecological Where ecological features have 1.2
enhancement been designed for positive
enhancement in accordance with
the recommendations of a
suitably qualified ecologist
Protection of Where all existing features of 1.2
ecological ecological value are maintained
features and adequately protected from
damage during site preparation
and construction works
Change in Where the resulting change in One of the following
ecological value ecological value is as follows point scores
of the site calculated using the Code Change
(see Technical Guidance Manual for
details) in Ecological Value Calculator
• Minor negative change (-9 to -3) 1.2
• Neutral (<-3 to +3) 2.4
• Minor enhancement (<+3 to +9 3.6
• Major enhancement (>+9 4.8
Building EITHER EITHER
footprint Where the total combined floor 1.2
area: footprint ratio for all
houses on the site is greater
than 2.5:1; and
Where the total combined floor
area: footprint ratio for all flats
on the site is greater than 3.5:1
OR OR
Where the total combined floor 2.4
area: footprint ratio for all
dwellings on the site is greater
than 3.5:1
Practical Examples
Practical examples of home design to meet code levels 1, 3 and 6 are
illustrated in this section. It should be noted that code levels may be achieved
through a variety of different issue combinations. These examples should
therefore not be used as definitive guides for meeting any particular Code level.
Practical Examples
25
Code Level 1 – an illustrated example
A home meeting any level of the Code will have to meet certain minimum
standards. For Level 1 this means:
The home will have to be 10% more energy efficient than one built to the 2006
Building Regulations standards. This could be achieved by:
• Improving the thermal efficiency of the walls, windows, and roof (by using
more insulation or better glass for example);
• Reducing air permeability, that is by improving the control of the fresh air
into a home, and the stale air out of a home. (A certain amount of air
ventilation is needed in a home for health reasons);
• Installing a high efficiency condensing boiler;
• Carefully designing the fabric of the home to reduce thermal bridging
(thermal bridging allows heat to easily escape between the inner walls and
the outer walls of a home).
The home will have to be designed to use no more than about 120 litres of
water per person per day. This could be achieved by fitting a number of items
such as:
• 6/4 Dual Flush WC;
• Flow Reducing/Aerating taps throughout;
• 6-9 litres per minute shower (note that an average electric shower is about
6/7 litres per minute;
• 18ltr maximum volume dishwasher;
• 60ltr maximum volume washing machine.
Other minimum requirements are required for:
• Surface water management – this may mean the provision of soakaways and
areas of porous paving;
• Materials – this means a minimum number of materials meeting at least a ‘D’
grade in the Building Research Establishment’s Green Guide (the scale goes
from A+ to E);
• Waste management – this means having a site waste management plan in
place during the home’s construction, and adequate space for waste storage
during its use.
But to get to Level 1 you need a further 33.3 points. So the builder/developer
must do other things to obtain the other points such as:
• Providing accessible drying space (so that tumble dryers need not be used);
• Providing more energy efficient lighting (taking into account the needs of
disabled people with visual impairments);
• Providing cycle storage;
• Providing a room that can be easily set up as a home office;
• Reducing the amount of water than runs off the site into the storm drains;
• Using environmentally friendly materials;
• Providing recycling capacity either inside or outside the home.
Code Level 3 – an illustrated example
A home meeting any level of the Code will have to meet minimum standards
for certain items depending on what level is desired. For Level 3 this means:
The home will have to be 25% more energy efficient than one built to the 2006
Building Regulations standards. This could be achieved by:
• Improving the thermal efficiency of the walls, windows, and roof as far as
is practically possible (by using more insulation or better glass for example);
• Reducing air permeability to the minimum consistent with health
requirements (a certain amount of air ventilation is needed in a home for
health reasons);
• Installing a high efficiency condensing boiler;
• Carefully designing the fabric of the home to reduce thermal bridging
(thermal bridging allows heat to easily escape between the inner walls
and the outer walls of a home);
• Possibly using district heating systems or low and zero carbon technologies
such as solar thermal panels or biomass boilers to help heat the hot water.
The home will have to be designed to use no more than about 105 litres of
water per person per day. This could be achieved by fitting a number of items
such as:
• 6/4 Dual Flush WC;
• Flow Reducing/Aerating taps throughout;
• 6-9 litres per minute shower (note that an average electric shower is about
6/7 litres per minute);
• a smaller, shaped bath – still long enough to lie down in, but less water
required to fill it to a level consistent with personal comfort;
• 18ltr maximum volume dishwasher;
• 60ltr maximum volume washing machine.
Other minimum requirements are required for:
• Surface water management – this may mean the provision of soakaways and
areas of porous paving;
• Materials – this means a minimum number of materials meeting at least a ‘D’
grade in the Building Research Establishment’s Green Guide (the scale goes
from A+ to E);
• Waste management – this means having a site waste management plan in place
during the home’s construction, and adequate space for waste storage during
its use.
But to get to Level 3 you need a further 46.7 points. So the builder/developer
must do other things to obtain the other points such as:
• Providing drying space (so that tumble dryers need not be used);
• Providing more energy efficient lighting (both internally and externally);
• Providing cycle storage;
• Providing a room that can be easily set up as a home office;
• Reducing the amount of water than runs off the site into the storm drains;
• Using much more environmentally friendly materials;
• Providing recycling capacity either inside or outside the home;
• Enhancing the security of the home;
• Enhancing the sound insulation used in the home.

Practical Examples
Code Level 6 – an illustrated example
A home meeting any level of the Code will have to meet minimum standards
for certain items depending on what Level is desired. For Level 6 this means:
The home will have to be completely zero carbon (i.e. zero net emissions of
carbon dioxide (CO2) from all energy use in the home). This could be achieved by:
• Improving the thermal efficiency of the walls, windows, and roof as far as is
practically possible (by using more insulation or better glass for example);
• Reducing air permeability to the minimum consistent with health
requirements (a certain amount of air ventilation is needed in a home
for health reasons);
• Installing a high efficiency condensing boiler, or being on a district
heating system;
• Carefully designing the fabric of the home to reduce thermal bridging (thermal
bridging allows heat to easily escape between the inner walls and the outer
walls of a home);
• Using low and zero carbon technologies such as solar thermal panels, biomass
boilers, wind turbines, and combined heat and power systems (CHP). It would
mean for example that energy taken from the national grid would have to be
replaced by low or zero carbon generated energy, so that over a year the net
emissions were zero.
The home will have to be designed to use no more than about 80 litres of
water per person per day. This could be achieved by fitting such items as:
• 6/4 Dual Flush WC;
• Flow Reducing/Aerating taps throughout;
• 6-9 litres per minute shower (note that an average electric shower is about
6/7 litres per minute);
• a smaller, shaped bath – still long enough to lie down in, but less water
required to fill it to a level consistent with personal comfort;
• 18ltr maximum volume dishwasher;
• 60ltr maximum volume washing machine.
To achieve the standard would also mean that about 30% of the water
requirement of the home was provided from non-potable sources such as
rainwater harvesting systems or grey water recycling systems.
Other minimum requirements are required for:
• Surface water management – this may mean the provision of soakaways and
areas of porous paving;
• Materials – this means a minimum number of materials meeting at least a ‘D’
grade in the Building Research Establishment’s Green Guide (the scale goes
from A+ to E);
• Waste management – this means having a site waste management plan in place
during the home’s construction, and adequate space for waste storage during
its use.
But to get to Level 6 you need a further 64.9 points. So the builder/developer
must do many other things to obtain the other points. In fact they will need to
do 90% of everything in the Code to achieve Level 6, including:
• Energy efficient appliances, and lighting;
• Supplying accessible water butts;
• Reducing surface water run-off as much as possible;
• Using highly environmentally friendly materials;
• Minimising construction waste;
• Maximum, accessible provision for recycling;
• Improved daylighting, sound insulation and security;
• Building to the Lifetime Homes standard;
• Assessing and minimising the ecological impact of the construction of the home.
This booklet introduces the Code for Sustainable Homes – the new national
standard for designing and constructing homes to a higher standard of
sustainability. It will be useful for all those involved in the home building
industry, including designers, builders, product manufacturers, and assessors,
to understand what the Code is, how it works, and what benefits it brings.
This booklet will also be of interest to members of the wider public with an
interest in sustainability.