Transcript Suspurpol Project

THE CODE FOR SUSTAINABLE
HOMES: AN INTRODUCTION
Dr. Richard Williams
Project Manager
SusPurPol
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CSH CONTENTS
• Draft published in Dec 2005
•Widely criticised by nearly everyone as too
weak.
• Final publication in Dec 2006. The Code stronger.
• Lowest levels of Code raised above min. building regs.
• Min. standards for energy and water efficiency at all levels.
• At entry level min. standards for materials, surface water run-off and
waste management.
• Use of low/zero carbon technologies to receive credits.
• Government “minded to make…Code mandatory
in the future”.
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CSH: OBJECTIVES
• As recommended by the
Sustainable Buildings Task Group
• Encourage home builders to
construct more sustainable homes
• Single national standard for
England
• Industry guide for design and
construction for new homes
• Driving continuous improvement in
legislation, policy and good
practice
• A mark of quality
• Voluntary – may become
mandatory in future
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CSH: PARTNERS
• Department for Communities and Local
Government – own the method
• Developers/Architects/Clients – designing and
constructing homes
• Assessors – qualified to carry out Code Ratings
• BRE – Implements and certifies Code Ratings
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CSH: KEY FEATURES
• Nine categories of environmental sustainability
• Applied at the level of an individual Code Dwelling Type
• 2 stage process - final certificate at Post Construction
Review stage
• Mandatory standards for energy, water, materials, waste
and surface water run-off
• Higher minimum standards for energy and water to be met
to achieve higher ratings
• 6 level rating system – a tool for marketing!
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CSH: MINIMUM STANDARDS
Categories
Flexibility
Energy Efficiency
6 levels of minimum standards one for each level
of the Code
Water Efficiency
Three levels of minimum standards each
covering two levels of the Code
Materials
A single basic standard at Code entry level
Surface Water Run
Off
Waste
Pollution
No minimum standards
Health & Well-Being
Management
Ecology
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Regulatory minimum
Number of buildings
breeam
Minimal
Aspirational
Environmental Standards
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Level 6
Level 5
Level 4
Level 3
Level 2
Level 1
CSH IN THE MASS MARKET
CSH EVALUATION PROCESS
• Part 1 - Design Stage
– Based on design drawings,
specifications and commitments
– Results in interim certificate of
compliance
• Part 2 - Post Construction Review
– Based the design stage information
– Confirmation of compliance through
site records and visual inspection.
– Code certificate awarded based on
compliance at this stage.
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ECOHOMES vs CSH
EcoHomes
CSH
Site Assessment
Individual Dwelling Assessment
Usually ‘design stage’ only
Assessed in 2 stages –
design stage and upon completion.
Flexible standards in all
categories
Fixed Minimum Standards
(thresholds) for some categories
Absolute carbon levels
Energy based on percentage
improvement over Building
Regulations
New points for ‘Lifetime Homes’
Locational credits related to transport
and amenities omitted.
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CSH CATEGORIES: 1
• Energy/CO2
• Water
• Materials
• Surface Water
Run-off
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CSH CATEGORIES: 2
• Waste
• Pollution
• Well-being
• Management
• Ecology
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CSH MANDATORY ISSUES
• Mandatory performance levels for 6 key issues at entry level:
– Energy Efficiency
– Water Efficiency
– Surface Water Management
– Site Waste Management
– Household Waste Management
– Use of Materials
• Higher minimum thresholds for Energy and Water at upper
levels of the Code
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CSH MINIMUM ENERGY STANDARDS
Code
Level
Energy
Performance
Equivalent rating
Level 1
10% improvement
EST Good practice
Level 2
18% improvement
Level 3
25% improvement
EST Best practice
Level 4
44% improvement
Approx. PassivHaus / EST
exemplary
Level 5
100% improvement
Level 6
Full “Zero Carbon”
Based on SAP:2005 calculation and % improvement on 2006 Building
Regulations Part LA
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CSH MINIMUM WATER STANDARDS
Based on consumption of internal potable
water in litres / person / day using the
Code Water Calculator
• Levels 1 & 2 – Above proposed water
regulations level (120 l / p / d)
• Levels 3 & 4 – Cost effective water saving
fittings (105 l / p / d)
• Levels 5 & 6 – Water recycling/ rainwater
collection (80 l / p / d)
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CSH MINIMUM SURFACE WATER RUN-OFF
STANDARDS
Surface Water Management
• Ensure that peak runoff rates and
annual volumes of run-off will be
no greater than the previous
conditions for the development site
• Requirement for all Levels
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CSH: MINIMUM MATERIALS STANDARDS
Environmental Impact of Materials
• At least 3 of the following 5 key
elements to achieve at least a D
rating in the 2007 Green Guide:
• Roof
• External Walls
• Upper and Ground Floors
• Internal Walls
• Window
• Requirement for all Levels
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CSH: MINIMUM WASTE STANDARDS
Site Waste Management
• Ensure there is a Site Waste
Management plan in operation which
requires the monitoring and setting of
targets to promote resource efficiency on
site.
• Requirement for all Levels
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CSH: MINIMUM WASTE STANDARDS
Household Waste
• External space that allows the storage
of:
EITHER
– All LA recycling boxes
OR
– 100 litres of waste storage per one
bedroom dwelling. An additional 70
litres is required for every additional
bedroom.
• Requirement for all Levels
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ACHIEVING CSH LEVEL 1: 1
• Energy – 10% improvement
• Water – 120 litres / person / day
• Minimum requirements met for:
– Materials
– Surface water run-off
– Site waste management
– Household waste management
• Additional 33 optional points (out of Level 1 requirement of 36)
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ACHIEVING CSH LEVEL 1: 2
• Meeting the Energy Requirements
– Improved thermal efficiency of building fabric
– Reduction in air permeability
– High efficiency condensing boiler
– Reduction of thermal bridging
• Meeting the Water Requirements
– 6/4 litres Dual Flush WC
– Flow reducing / aerating taps
– 6-9 litres /min shower flow rate
– 13 litres max volume (typical practice) dishwasher
– 49 litres max volume (typical practice) washing machine
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ACHIEVING CSH LEVEL 2
• Energy – 18% improvement
• Water – 120 litres / person / day
• Minimum requirements met for:
– Materials
– Surface water run-off
– Site waste management
– Household waste management
• Additional 42 optional points (out of Level 2 requirement of 48)
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ACHIEVING CSH LEVEL 3: 1
• Energy – 25% improvement
• Water – 105 litres / person / day
• Minimum requirements met for:
– Materials
– Surface water run-off
– Site waste management
– Household waste management
• Additional 47 optional points (out of Level 3 requirement of 57)
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ACHIEVING CSH LEVEL 3: 2
• Meeting the Energy Requirements
– Measures outlined for Code Level 1
– + possible use of low or zero carbon technologies
• Meeting the Water Requirements
– 4/2.5 litres Dual Flush WC
– Flow reducing / aerating taps
– 6-8 litres/min shower flow rate
– Smaller, shaped bath
– 13 litres max volume (typical practice) dishwasher
– 49 litres max volume (typical practice) washing machine
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ACHIEVING CSH LEVEL 4
• Energy – 44% improvement
• Water – 105 litres / person / day
• Minimum requirements met for:
– Materials
– Surface water run-off
– Site waste management
– Household waste management
• Additional 54 optional points (out of Level 4 requirement of 68)
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ACHIEVING CSH LEVEL 5
• Energy – 100 % improvement
• Water – 80 litres / person / day
• Minimum requirements met for:
– Materials
– Surface water run-off
– Site waste management
– Household waste management
• Additional 60 optional points (out of Level 5 requirement of 84)
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ACHIEVING CSH LEVEL 6: 1
• Energy – Full Zero Carbon (approximate 145% improvement)
• Water – 80 litres / person / day
• Minimum requirements met for:
– Materials
– Surface water run-off
– Site waste management
– Household waste management
• Additional 65 optional points (out of Level 6 requirement of 90)
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ACHIEVING CSH LEVEL 6: 2
Meeting the Energy Requirements
– Full Zero Carbon incl. all energy used for small power (SAP
calculation excludes small power)
– Very high building fabric performance
– Low and zero carbon technologies
Meeting the Water Requirements
– Lowest flow showers
– Lowest capacity WC
– All WC flushing water from grey water sources
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•• Water
Water Surface
SurfaceRun
Run-off
-off
•• Energy
Energy
•• Potable
PotableWater
Water
Consumption
Consumption
•• Waste
Waste
•• Materials
Materials
•• Water
Water Surface
SurfaceRun
Run-off
-off
•• Pollution
Pollution
•• Health
Health && Wellbeing
Wellbeing
•• Management
Management
Environmental Weightings
•• Energy
Energy
•• Potable
PotableWater
Water
Consumption
Consumption
Issue Category Scores
Mandatory
Standards
Tradable Credits
•• Waste
Waste
•• Materials
Materials
Overall
Score
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Level 1
Level 2
Level 3
Level 4
Level 5
Level 6
CSH WEIGHTINGS
Category
Credits
% Final Score
Energy
29
36.4
Potable Water
6
9
Surface Water Runoff
4
2.2
Materials
24
7.2
Waste
7
6.4
Pollution
4
2.8
Health and Wellbeing
12
14
Management
9
10
Site Ecology
9
12
TOTAL
104
100
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CSH LEVELS AND POINTS SCORE
Code Levels
Total Points Score
out of 100
(equal to or greater
than):
Equivalent
EcoHomes rating
Level 1 ()
36 Points
Pass
Level 2 ()
48 Points
Good
Level 3 ()
57 Points
Very Good
Level 4 ()
68 Points
Excellent
Level 5 ()
84 Points
Level 6 () 90 Points
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CSH ASSESSMENT
• Some credits could be the same across the
whole development site
• Some are specific to individual dwelling types
WHOLE SITE
e.g. Flood risk
Ecology
Waste management
+
INDIVIDUAL DWELLING TYPE
e.g. Daylighting
Home office
Cycle storage
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CSH DWELLING TYPE
• For dwellings to be of
the same Code
Dwelling Type they
must be identical in
every aspect that
affects the code
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CSH DWELLING TYPE
Same Code Dwelling Type means the same in all these
aspects:
• SAP rating (input data and output data should be the
same)
• Lighting
• Day lighting
• Acoustic performance
• Materials used
• Water features
• Cycle storage facilities
• Etc etc.
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CSH WHOLE SITE ISSUES
Other examples of issues that can be assessed
over the whole site:
• Ecology
• Flood risk
• Water run-off
• Considerate Constructors
• Site Waste Management
• Construction Site Impacts
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CSH CAPITAL COSTS: 1
• Code Level 3 designed to be approximately
EcoHomes ‘Very Good’ However:
– Mandatory performance levels make it more
expensive – less room to move
– Water standards are considerably higher than
current practice
– Brings in Life time Homes
– Removes some ‘locational’ benefits i.e.
proximity to local amenities
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CSH CAPITAL COSTS: 2
• CLG RIA of meeting Code Level 3 available but will be updated
if assessment made mandatory http://www.communities.gov.uk/
• English Partnership/Housing Corporation research carried out
by Cyril Sweett - Focused on impact of achieving Level 3 over
EcoHomes 2006 ‘Very Good’. (Available now via EP website.)
• Level 6 is expensive though – likely to be at least £15-20k per
unit depending on context with today's technologies and
market prices.
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CSH CAPITAL COSTS: 3
• Currently hard to know the cost implications but
there are two conflicting issues to consider
– EcoHomes credits based on 80% compliance allow
some poor performers to be accepted – Therefore
costs are kept down
– Code credits applied at the level of each dwelling
therefore this is no longer available
• BUT each dwelling type can now be designed to go
for the most appropriate credits e.g. acoustic credits
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CSH INTERIM ARRANGEMENTS
• CSH for new build housing in England from April
2008
• BUT EcoHomes will continue in England
– For all refurbishment projects
– For Housing Corporation funded schemes from 2006-8
allocation (more on this later)
– For sites where it is required as a result of contractual
commitment
– For existing assessments registered under EcoHomes
• EcoHomes will continue in Scotland, Northern
Ireland and Wales
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CSH MANDATORY ASSESSMENTS
• Under consideration by
ministers
• Introduction in future
• Requirement to carry out
assessment and display
results
• No specific performance
requirements
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WHAT DOES SUSTAINABLE DEVELOPMENT
LOOK LIKE?
BedZed, S. London
Poundbury, Dorset
Sedgwick Road, Bishopstoke
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