Code For Sustainable Homes2010 Technical Update

Overview

• General• Ene 1 2 3 4 7 8• Mat 2 3• Sur 1 2• Was 1 2 3• Hea 3 4

General

• All evidence requirements updated as per TGN002

• PCS exemptions– 60% rule for centralised infrastructure– Now variable where statutory requirements exist– Community heating systems

• Infrastructure to allow connection must be provided• All dwellings• Regardless of percentage completed

Energy and CO2 Emissions

Now 31 Credits

36.4% Weighting

1.17 % points per credit

Energy

Changes to issue names and credits awarded:

• Ene 1 Dwelling Emission Rate 10 credits (was15)

• Ene 2 Fabric Energy Efficiency 9 credits (was 2)

• Ene 3 Energy Display Devices 2 credits

Ene 1 – Dwelling Emission Rate

% improvement of DER over

TER

Credits Mandatory Levels

≥ 8% 1

≥ 16% 2

≥ 25% 3 Level 4

≥ 36% 4

≥ 47% 5

≥ 59% 6

≥ 72% 7

≥ 85% 8

≥ 100% 9 Level 5Zero Net CO2

Emissions10 Level 6

NB the tool will now award fractions of credits* So a 41.5% improvement will earn 4.5 credits

*using linear interpolation truncated to 1 d.p.

10 Credits

Changing numbers

2005 2009

100% 100%

25%

25%

44%

Code level 3

Code level 4

Code level 5

Old TER

New TER

19%

Ene 1 – Section 16 allowances

• Issues covered in Section 16 of SAP ARE NOTincluded in the DER in SAP

– Must add these separately in the calculator tool– Key question in the tool – are Section 16 allowances sought?

• Energy generation beyond the curtilage of the building (ie communal)– ZC5 - CO2 reduction from additional allowable

energy generation• Residual CO2 emissions offset from Biomass CHP

– ZC7 - Residual CO2 emissions offset from Biomass CHP

• Reduces the DER further still

SECTION

16

Dwellings in the same envelope

Energy Group

1 Energy Group

Top floor flats serviced by the PV

Different servicing strategies

2 Energy Groups

Dwellings in different blocks/envelopes

Dwellings in a terrace (Ene 1 only)

Same building envelope – can be grouped

1 Energy Group

Ene 2 – Fabric Energy Efficiency (FEE)

• Focuses on the inherent properties of dwelling

• kWh/m2/year

• From SAP FEE Worksheet– Box 109– Grouping/Averaging possible in

flats (only!)• Independent from the groups

for Ene1

9 Credits

Ene 2 – Fabric Energy Efficiency

Dwelling Type

Apartment Blocks, Mid-Terrace

End Terrace, Semi-Detached & Detached

Fabric Energy Efficiency kWh/m2/year Credits Mandatory Levels

≤ 48 ≤ 60 3≤ 45 ≤ 55 4≤ 43 ≤ 52 5≤ 41 ≤ 49 6

≤ 39 ≤ 46 7 Levels 5 & 6

≤ 35 ≤ 42 8≤ 32 ≤ 38 9

Ene 2 – Stepped/staggered terraces

• Stepped terraces

– Allowance made for greater exposed area

– Formula• See ‘Special Cases’ in manual

Ene 2 – Fabric Energy EfficiencyDwelling Type

Apartment Blocks, Mid-

Terrace

End Terrace, Semi-

Detached & Detached

Fabric Energy Efficiency kWh/m2/year Credits Mandatory

Levels≤ 48 ≤ 60 3≤ 45 ≤ 55 4≤ 43 ≤ 52 5≤ 41 ≤ 49 6≤ 39 ≤ 46 7 Levels 5 & 6≤ 35 ≤ 42 8≤ 32 ≤ 38 9

The scale for stepped will lie in between

These scales represent the 2 extremes

All calculations done automatically in the Ene 1/2 tool

Ene 1 / Ene 2 Prerequisites

• Section 16 allowances– Only creditable providing good fabric energy

efficiency– ie must get 5 credits in Ene 2 Fabric Energy

Efficiency

• Code level 6– Must get 7 credits in Ene 2 Fabric Energy

Efficiency

Quick reminder of key points

• Section 16 allowances – Refer to communal energy generation– Boxes ZC5 and ZC7 in SAP– Resultant DER is even lower

• Pre requisites– Section 16 allowances

• Only if 5 FEE Ene 2 credits awarded– Code level 6

• Only if 7 FEE Ene 2 credits awarded

• Stepped terraces– Recognised and accounted for in Ene 2

• Grouping (energy averaging)– Multiple dwellings in same building envelope

SECTION

16

Ene 3 – Energy Display Devices

• Consumption data• Correctly specified energy device

• 1 credit: Current electricity or primary heating fuel• 2 credits: Current electricity and primary heating fuel

• If electricity is primary heating fuel?

• Correctly specified energy device– Self charging sensors fixed to incoming mains supply– Displaying: Time, current mains consumption/emissions/tariff/cost,

account balance info, visual presentation, historical consumption

2 Credits

Ene 4 - Drying Space

• Internal drying space must have ventilation complying with Building Regulations AD F

In addition• Extract rate 30l/s minimum

Ene 7 - Zero/Low Carbon Technologies

• LZC technology specified must be:– Direct supply (dedicated)– Meet additional requirements defined in Directive 2009/28/EC– Certified under Micro-generation Certification Scheme (MCS)

• Under 50kWe or 300kWth• http://www.microgenerationcertification.org/

– Certified under CHPQA standard• Under 50kWe• http://www.chpqa.com/ for further info

– Accounted for in SAP

• Energy calculator tool needed• Proportion communal supply by net floor area• Green Tariffs do not comply• KgCO2/m2/year

Reduction in CO2 Emissions

Credits

10% 1

15% 2

Ene 7 - Methodology

• Standard case SAP– Actual SAP (from Ene 1) with some details replaced– See table CAT 1.2

• Mains gas• SEDBUK 88% boiler• Stored hot water etc

• Actual case– Standard case with some details replaced– ‘put back’ the actual values– But only if they correspond to ‘eligible technologies’

• Defined in EU directive – I.E.

• Has to be a LZC not just a more efficient gas boiler• No recognition in Ene 7 for a boiler of SEDBUK rating of > 88%

StandardSAP

‘Actual’ SAP

Ene 7 - Zero/Low Carbon Technologies

• See Table Cat 1.2 in ‘Calculation Procedures’– Only the actual values for eligible technologies can be

‘put back’– Some or all could be ‘put back’– Care needed

• Could mean 3 SAP sheets!– SAP of the actual building (used in Ene 1 and 2)– SAP of standard case– ‘Actual SAP’ = standard case with some actual values

‘put back’– Simple adjustments for a SAP assessor

Ene 8 - Cycle Storage

• Requirements for secure cycle storage met where compliance with clause 35 of Secured by Design New Homes 2010 is met– Just another way of demonstrating compliance

NB– Fully enclosed structure not required

Materials

Mat 2/3 Rigour of source – Tier systemTier level Issue assessed Points available

per elementEvidence/measure

assessedExamples of compliant schemes

1 Legality and responsible sourcing

3 Certification scheme FSC, CSA, SFI with CoC, PEFC, Reused Materials, and Schemes

compliant with BES6001:2008 (or similar) ‘Excellent’ and ‘Very Good’

Performance Ratings (Note: the EMS required to achieve these ratings must

be independently certified).

2b Legality and responsible sourcing

2 Certification scheme Schemes compliant with BES6001:2008 (or similar) ‘Pass’

Performance Rating (Note: the EMS required to achieve this rating must be

independently certified).

2a Legality and responsible sourcing

2.5 Certification scheme Schemes compliant with BES6001:2008 (or similar) ‘Good’

Performance Rating (Note: the EMS required to achieve this rating must be

independently certified).

3 Legality and responsible sourcing

1.5 Certification scheme/EMS Timber: MTCC, Verified, SGS, TFT

Other materials: Certified EMS for the Key Process and Supply Chain

Recycled Materials with Certified EMS for the Key Process.

4 Legality and responsible sourcing

1 Certification scheme/EMS Certified EMS for the key processstage.

Surface Water Run-Off

Sur 1 – Mandatory Requirement

There are still two key principles which need to be achieved to meet the mandatory requirements of Sur 1:

Peak rate of runoffEnsuring the peak rate of runoff is no greater post development than it was pre development

Volume of runoffEnsure that the post development volume of runoff is no greater than it was pre development. The approach to dealing with additional volumes of runoff should be in accordance with hierarchy outlined in the Technical Guide

Criteria Overview

Use SuDS management train:• 1 Peak rate of run off

– No greater than pre developed site

• 2A Volume of run off– Additional volume entirely reduced– Infiltration or other SuDS techniques– Must do this first, only move to 2B if 2A cannot be satisfied

• 2B Volume of run off– Reduce run off rate to limiting discharge– Must do 2A first where possible– Underground attenuation tanks possible solution here (not in 2A)

• Additional volumes of runoff should be prevented from leaving the site as far as possible using the relevant SuDS techniques

• If not all of the additional volume of runoff can be prevented from leaving the site, a full evaluation must be provided to confirm that all appropriate SuDS have been considered

• In this instance, any residual additional volume of runoff that could not be prevented from leaving the site, can be attenuated – stored and then discharged from the site at the ‘Limiting Discharge’.

Volume of runoff

Key changes to note in the mandatory requirements…

• Ensure an ‘Appropriately Qualified Professional’ (in line with the new definition) is employed to carry out the relevant calculations

• Climate change allowance should only be added to post development calculations

• Calculation methodologies for peak rates of runoff for Greenfield and Brownfield sites have been amended

• Amendments to the volume requirements• Special cases introduced in TGN001 are now within the

Technical Guide• Additional requirement to ensure that that flooding of a

property would not occur in the event of local drainage system failure

•

Using SUDS to improve or protect the quality of receiving watercourses.

Two methods:– Prevent the first 5 mm of rainfall from discharging

into the watercourse and

Two Optional Credits

– Ensure runoff from all hard surfaces will receive an appropriate level of treatment (in accordance with the SuDS manual)

Waste

Now 8 Credits

6.4 % Weighting

0.80 % points per credit

Was 1 - Storage of non-recyclable waste & recyclable household waste

Mandatory Requirement

• A suitable area of sufficient size to house the greatest volume ofEITHER– All containers provided by the Local Authority (Refuse and Recycling)

OR– The minimum capacity as calculated using BS 5906:2005

• Storage spaces must provide inclusive access and usability (checklist IDP*)

• Access route, surfaces, widths, doors, gates, stairs, communal rules, switches and sockets

*Inclusive Design Partnership

Was 2 - Construction Waste

Minimising (1 credit)• Site Waste Management Plan (SWMP)

– Benchmarks, commitments, procedures, monitoring, measuring, reporting etc

Diverting waste from landfill (2nd and 3rd credits)• SWMP has procedures and commitments to sort and divert waste

from landfill by either– 50% 2 credits– 85% 3 credits

– Checklists available

3 Credits

Was 3 - Composting Facilities

• Composting facilities– Inclusive access (Checklist IDP) also applies

Health and Wellbeing

Hea 3 - Private Space

Outdoor space:• Minimum size – allow all occupants to sit outside

• Provide inclusive access and usability (Checklist IDP)– Exemption of requirement 6A for roof terraces where step up is

unavoidable

• Accessible only to occupants of designated dwellings

Hea 4 - Lifetime Homes

• Special case introduced– Plots with gradient exceeding gradient 1:15

• Help on calculating this in the Guidance – Exempt from Lifetime Homes criteria 2 and/or 3– 3 credits can be awarded in this case– Level 6 Mandatory level also met– But will not qualify as a ‘Lifetime Home’!