Part L 2013 - Paul Davidson at Ecobuild 2014-03-06

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Information about Part L 2013 - Paul Davidson at Ecobuild 2014-03-06

Published on March 7, 2014

Author: BREGroup



Paul Davidson gave this informative summary of the 2013 changes to Part L of the building regulations at Ecobuild

Part L 2013 Paul Davidson Director, Sustainable Energy 6th March 2014 With thanks to DCLG and AECOM for slides Part of the BRE Trust

Part L 2013: Backdrop to Policy Decisions – Striking a balance between Growth and Green policy ambitions – Growth: • Spending Review 2010 commitment • A one-in, two-out approach to regulation • Micro-business moratorium until April 2014 – Green: • Meaningful step towards Zero Carbon • Climate Change Act, contribution to 4th Carbon Budget • Reducing energy costs for consumers and business • Improving as-built performance – …. and the Red Tape Challenge - call for simplification

Part L 2013: New Homes - summary • • • • • • A technically meaningful step towards Zero Carbon homes respecting deregulatory commitments and growth agenda 6% uplift to CO2 targets across build mix with a focus on fabric innovation and learning, affordability and cost effectiveness Broadly as consultation but relaxed for detached homes on basis of cost effectiveness and consistency of construction Fuel factors retained at current levels - helps to reduce overall regulatory burden particularly upon rural house builders Concurrent notional building based on robust fabric standards plus efficient services New mandatory energy target 3

Reminder: new-build 2010 The five compliance steps: 1.Achieving the TER - Dwelling Emission Rate (DER) ≤ Target Emission Rate (TER) 2.Limits on design flexibility – fabric standards and system efficiencies 3.Limiting the effects of solar gains in summer 4.Building Performance consistent with DER - Quality of construction & commissioning 5.Provisions for energy efficient operation of the dwelling - Providing information / O&M instructions Page 4

Criterion 1 changes: Calculating the TER – Traditionally, Part L1A has targeted the same percentage improvement against a historic 2002 performance standard across all dwelling types – But the challenge in reducing CO2 can vary significantly by building type – As proposed in the consultation, Part L 2013 introduces a concurrent standard that: – Features a good level of fabric and service efficiencies – Is common to all dwelling types

Criterion 1 changes: Introducing the TFEE – The Zero Carbon Hub proposed additional target based on limiting space heating and space cooling demand – Known as the Fabric Energy Efficiency Standard (FEES) – Measured in kWh/m2.y – Assesses performance of passive measures e.g. thermal insulation, air tightness – Ensures that zero carbon is based on a foundation of a high standard of fabric energy efficiency Allowable solutions On-Site LZC Energy and Connected Heat Energy Efficiency The ‘zero carbon triangle’ Page 6

Part L 2013: The Notional dwelling – Target CO2 Emission Rate (TER) and new Target Fabric Energy Efficiency (TFEE) rate both generated by concurrent notional dwelling – the latter relaxed back by 15% – Notional dwelling is same shape and size as actual dwelling and based on a set of “current” fabric and service specifications – The recipe is in itself a compliant solution but is not prescriptive and may not be the most cost effective for all – Rather it provides a robust starting point for builders, large or small - and scope for innovation 7

Part L 2013: New Homes Allowable Solutions Consultation on design principles ? Carbon Compliance Part L 2013 Carbon Target Carbon Compliance for 2016 ? Fabric Energy Efficiency: Part L 2013 Energy target FEES for 2016 ? 8

New-build 2013: The amended five compliance steps 1.Achieving the TER and the TFEE DER ≤ TER and Dwelling Fabric Energy Efficiency (DFEE) ≤ Target Fabric Energy Efficiency (TFEE) 2.Limits on design flexibility 3.Limiting the effects of heat gains in summer 4.Building Performance Consistent with DER - Quality of construction & commissioning 5.Provisions for energy efficient operation of the dwelling Providing information / O&M instructions 9

Criterion 1 changes: Fuel factor • The fuel factor relaxes the carbon target (TER) for homes heated by a more carbon intensive fuel than gas • Particularly helpful for – Off-gas grid homes – Electrically heated apartments • With no fuel factor, these homes would need to meet the same TER as if using gas • With a fuel factor, the TER is eased to reduce cost but still requires some additional measures compared to gas homes to reduce emissions % uplift in carbon intensity of fuel compared to mains gas

Criteria 2 changes: Elemental backstops – Keep fabric elemental backstops: – Achieving the TFEE standard could be very dependant on high performance of one specific feature of fabric design – If this feature performed less well than expected, it would significantly impact on performance – Elemental values are unchanged from Part L 2010 - very much a backstop – Back stops for building services are covered by domestic building services compliance guide Limiting Fabric Parameters Roof 0.20 W/m2.K Wall 0.30 W/m2.K Floor 0.25 W/m2.K Party Wall 0.20 W/m2.K Windows, Doors 2.0 W/m2.K Air permeability 10 m3/hr.m-2

Part L 2013: New non-domestic buildings • Again focus is on taking a sensible cost effective step towards zero carbon • 9% aggregate CO2 target uplift with elemental backstops – variability of non domestic build mix does not lend itself to introduction of absolute or mandatory energy targets • Wider range of concurrent notional buildings including modifications for smaller warehouses • Achievable through good fabric and services in most building types, consistent with fabric emphasis for homes but not prescriptive 12

Part L 2013: New Non Domestic Buildings Uplift by Building Type Distribution Warehouse 4% Deep Plan Office with AC 12% Retail Warehouse 8% Shallow Plan Office 13% Hotel 12% School 9% Small Warehouse 3% Aggregate across Build Mix 9% 13

Other changes to AD L2A: Lighting 2010 – Actual design lux level irrelevant – rebased to notional building value. – So supermarket designed to 2000 lux, rebased to notional building 800 lux. 2013 – Actual installed lighting wattage used, penalising overlit spaces. – Maintenance factors are assumed in the notional and should be included in calculated values in the actual – Constant illuminance controls are available in the actual – LENI method can be used to show compliance with Criterion 2 14

Part L 2013: Existing buildings • Government announced in Dec 2012 it will not be regulating for additional “consequential improvements” at this time. • Also no uplift to extension and window standards – Government does not want to impose upon hard working consumers • Some strengthening of specific non-domestic services standards for chillers, fan coil units and lighting • Alternate option for demonstrating compliance with lighting standards (Lighting Energy Numeric Indicator - LENI) 15

Part L 2013: Guidance – New style ADL1A and ADL2A – single column tablet friendly – including summary of notional buildings – Working with industry to develop pattern books e.g. similar to Part L 2010 “Where to Start Guide” and also a library of advanced construction joint details – Amendments to 2010 versions of ADL1B and ADL2B – on points of clarification only – New Building Services Compliance Guides 16

Part L 2013 guidance – at DCLG’s Planning Portal Coming into force 6th April 2014

Calculation tools SAP and SBEM – Changes to calculation engines – Implementation of compliance rules – SAP – SBEM

SAP 2012 – Updated from SAP 2009 – Consultation completed in 2012 – Published May 2013 – Minor improvements to calculations and assumptions – Changes to emission factors – Details at

SAP Appendix R – Contains parameters required to model Notional Building – For CO2 target (TER) – And target fabric energy efficiency (TFEE) – Published in October 2013, as an updated full SAP document – Applies to England only for now – Other country versions to follow

Temporary SAP software – Based on cSAP (produced for consultation) – Implements SAP 2012 – Pending development and approval of commercial tools – Derives the TER and TFEE according to new Appendix R and ADL1A – Allows housebuilders and industry to explore new requirements and test new designs and products – CANNOT be used to demonstrate compliance – Available from December 2013 at

cSAP for 2013 trials

Part L compliance report (BRUKL) - extract

SBEM – current ‘live’ version v4.1.e

SBEM 2013 – v5.2.a – Based on v 4.1.e , with improvements – – – – Improved treatment of shading devices Improved handling of PV systems Non-transpired solar collectors Enhanced reporting on Criterion 2 compliance – New category of Notional Building, based on daylight – – – – Side-lit, heated only Side-lit, heated and cooled Top-lit Un-lit – New concurrent Notional Building as per NCM and ADL2A – CANNOT yet be used to demonstrate compliance – Available from December 2013, at

SBEM outputs

Other SBEM issues – Updated NCM Modelling Guide also released – Specifications for DSM and alternative interface software – New version will include Green Deal tool – And live EPCs for Scotland – Final, full version for April 2014

Thank you! Paul Davidson Director, Sustainable Energy Part of the BRE Trust

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