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THE CODE FOR SUSTAINABLE HOMES: AN INTRODUCTION. Dr. Richard Williams Project Manager SusPurPol. CSH CONTENTS. Draft published in Dec 2005 Widely criticised by nearly everyone as too weak. Final publication in Dec 2006. The Code stronger.

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the code for sustainable homes an introduction

THE CODE FOR SUSTAINABLE HOMES: AN INTRODUCTION

Dr. Richard Williams

Project Manager

SusPurPol

slide2

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”.
csh objectives
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
csh partners
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
csh key features
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!
csh in the mass market
CSH IN THE MASS MARKET

Level 1

Level 2

Level 5

Level 3

Level 4

Level 6

Regulatory minimum

Number of buildings

breeam

Aspirational

Minimal

Environmental Standards

csh evaluation process
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.
csh categories 1
CSH CATEGORIES: 1
  • Energy/CO2
  • Water
  • Materials
  • Surface Water Run-off
slide11

CSH CATEGORIES: 2

  • Waste
  • Pollution
  • Well-being
  • Management
  • Ecology
csh mandatory issues
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
csh minimum energy standards
CSH MINIMUM ENERGY STANDARDS

Based on SAP:2005 calculation and % improvement on 2006 Building Regulations Part LA

csh minimum water standards
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)
csh minimum surface water run off standards
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
csh minimum materials standards
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
csh minimum waste standards
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
csh minimum waste standards18
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
achieving csh level 1 1
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)
achieving csh level 1 2
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
achieving csh level 2
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)
achieving csh level 3 1
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)
achieving csh level 3 2
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
achieving csh level 4
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)
achieving csh level 5
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)
achieving csh level 6 1
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)
achieving csh level 6 2
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
slide28

Issue Category Scores

Environmental Weightings

Overall

Score

Waste

Waste

Materials

Materials

Water Surface Run

-

off

Mandatory

Standards

Water Surface Run

-

off

Energy

Energy

Potable Water

Potable Water

Consumption

Consumption

Energy

Energy

Potable Water

Potable Water

Consumption

Consumption

Level 1

Waste

Waste

Level 2

Materials

Materials

Level 3

Tradable Credits

Water Surface Run

-

off

Level 4

Water Surface Run

-

off

Level 5

Pollution

Pollution

Level 6

Health & Wellbeing

Health & Wellbeing

Management

Management

csh assessment
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

+

csh dwelling type
CSH DWELLING TYPE
  • For dwellings to be of the same Code Dwelling Type they must be identical in every aspect that affects the code
csh dwelling type33
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.
csh whole site issues
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
csh capital costs 1
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
csh capital costs 2
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.
csh capital costs 3
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
csh interim arrangements
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
csh mandatory assessments
CSH MANDATORY ASSESSMENTS
  • Under consideration by ministers
  • Introduction in future
  • Requirement to carry out assessment and display results
  • No specific performance requirements
what does sustainable development look like

WHAT DOES SUSTAINABLE DEVELOPMENT LOOK LIKE?

BedZed, S. London

Poundbury, Dorset

Sedgwick Road, Bishopstoke