In this issue
Going Nuclear in North Wales
The Proof of the Pudding
(I&C) Waste Generation Survey and (C&D) Waste Generation Surveys 2012


Cost of Zero Carbon and the Performance Gap

Welsh flyer below / Hysbyseb Cymraeg Islaw

Title: Cost of Zero Carbon and the Performance Gap
Date: Thursday 19th June 2014
Location: Cardiff (venue confirmed on registration)
Time: 8am – 10.30am
Cost: £30 to Best Practice Club members, £35 (+ VAT) to non-members

Following recent Welsh Government's announcements regarding the withdrawal of TAN 22 and sustainable building standards and those within the queen's speech on allowable solutions and zero carbon homes the Welsh Government will be speaking at this event to provide an update. 

The Wales Low Zero Carbon Hub is pleased to welcome the Zero Carbon Hub to present two recently published reports into The Cost of Building to Zero Carbon and the Performance Gap. New analysis produced by Sweett Group for the Zero Carbon Hub shows that the additional costs associated with building to Zero Carbon Standards have declined since 2011, and are expected to continue to fall as we approach 2020. With regard to the performance gap there has been a growing realisation that homes designed to meet current and future standards of energy performance may fall short of expectations. This event will present the key findings from investigation into the cost of building to zero carbon standards and the evidence review report undertaken by the Zero Carbon Hub into the major reasons that the performance gap occurs. 

The Cost of Zero Carbon Key Findings are:

  • At today's prices, the typical additional cost of building a semi detatched house to the zero carbon standard could be less than £5,000
  • Since 2011 costs have roughly halved
  • By 2020, the additional cost of building a new semi detatched home could be less than £3,500

Download the full Cost report  
Download the Infographic 

Why is there a performance gap?

This gap might arise in a number of ways within the overall house-building process and, if significant and widespread, may constitute a considerable risk. 

Why is closing the gap important?

A gap in a building’s performance would mean that new housing cannot be relied upon to play its expected role in the national carbon reduction plan. For owners and occupants, energy bills may be higher than expected, undermining buyer confidence in new (low carbon) homes. For these reasons, even though the origin, size and extent of the gap have not been precisely identified to date, its investigation is seen as a high priority by government and by a wide spectrum of interest groups across the sector.

In order to help facilitate the closure of the gap between design and as‐built performance, the Zero Carbon Hub is leading a major project that collaboratively engages industry and government in seeking and implementing solutions. The project was launched by the then Minister responsible for Building Regulations, the Rt. Hon Don Foster MP at EcoBuild 2013. The evidence review report was published March 2014.

Closing the Gap Between Design and As-Built Performance - Evidence Review Report

What’s in the report?

The report summarises the evidence gathering and assessment process undertaken between August 2013 and January 2014. It provides industry and government with a structured review of how and where the Performance Gap occurs within the current house building process. This has involved a co-ordinated analysis of published literature and confidential industry research, and the development of a process review methodology to gather primary evidence from house building delivery teams, including visits to live construction sites. The evidence collected so far has been used to prioritise which issues are considered to be the major contributors to the Performance Gap.1 The prioritisation process has been based upon the extent of evidence found and the significance each issue is considered to have on the Performance Gap.

How to Book: To reserve your place please email CEWales Events stating your full contact details and the names of all delegates wishing to attend. Substitution of delegates can be made at any time.

To become a Best Practice Club member visit our Club Page for details. Payments can now be made by credit/debit card.

Non-attendance by any registered delegate will be charged in full unless you have informed us by Tuesday 17th June.

In order to reduce wastage at our events CEW operates a policy of only notifying venue details when issuing registration confirmation. This ensures we only cater for delegates who have registered and don’t over order for individuals who may or may not turn up on the day.



CEWales Website

Teitl: Y gost o godi adeiladau di-garbon a’r Bwlch mewn Perfformiad
Dyddiad: Dydd Iau 19 Mehefin 2014
Lleoliad: Caerdydd
Amser: 8am – 10.30am
Cost: £30 i aelodau’r Clwb Arfer Gorau, £35 (+ TAW) i rai nad ydynt yn aelodau

Mae Grwp Carbon Isel a Di-garbon Cymru yn falch o groesawu ‘r Grwp Di-garbon i gyflwyno dau gyhoeddiad diweddar yn delio â’r gost o Adeiladau Di-garbon a’r Bwlch mewn Perfformiad. Gwnaeth Grwp Sweett ddadansoddiad yn dangos fod y costau ychwanegol o adeladu tuag at y safonau di-garbon wedi gostwng ers 2011, ac yn debygol o leihau eto cyn 2020.

Wrth inni sylweddoli fod tai yn cael eu hadeiladu na fydd yn cyrraedd safonau’r perfformiad ynni a ddisgwylid, bydd y digwyddiad yn trafod y dystiolaeth o ymchwil wnaed gan y Grŵp Di-garbon a’r prif resymau dros y bwlch mewn perfformiad.

Prif negeseuon Y Gost o Adeiladau Di-garbon:

• mae cost ychwanegol o adeiladu tŷ talcen i’r safon di-garbon, yn ôl prisiau heddiw, yn llai na £5,000
• ers 2011 mae costau wedi haneru
• erbyn 2020, bydd y gost ychwanegol o godi tŷ talcen yn debygol o fod yn llai na £3,500

Lawrlwythwch yr Adroddiad
Lawrlwythwch y llunwybodaeth


Pam bod y bwlch mewn perfformiad yn bodoli?

Mae’n codi mewn nifer o ffyrdd yn ystod y broses o godi tai, ac yn elfen o risg os yw’r arferiad yn un arwyddocaol ac yn gyffredin yn y byd adeiiladu.

Pam bod cael gwared ohonno mor bwysig?

Os nad ydyw’r adeilad yn perfformio fel dylai, mae’n golygu nad oes modd dibynnu ar dai newydd i leihau lefelau carbon. Gall perchnogion wynebu biliau uwch na’r disgwyl, sy’n tanseilio ffydd cwsmeriaid yn y dai carbon isel yma. Er nad yw maint, ystod na ffynhonell y bwlch mewn perfformiad yn wybyddus hyd yma, mae’r llywdoraeth a grwpiau eraill ar draws y sector yn rhoi blaenoriaeth i ymchwil i’r broblem.

Er mwyn hwyluso cau’r bwlch rhwng dyluniad a perfformiad tai gorffenedig, mae’r Grŵp Di-garbon yn arwain prosiect ar y cyd rhwng y llywodraetha’r diwydiant adeiladu i ddarganfod atebion i’r broblem. Lawnswyd y proseict gan y Gwir Anh Don Foster AS, y Gweinidog gyda chyfrifoldeb ar y pryd am y Rheoliadau Adeiladu, yn EcoBuild 2013. Cyhoeddwyd adroddiad yn adolygu’r dystiolaeth ym Mawrth 2014. 

Closing the Gap Between Design and As-Built Performance - Evidence Review Report

Beth sydd yn yr adroddiad?

Mae’r adroddiad yn crynhoi y broses o gasglu tystiolaeth a gymerodd le rhwng Awst 2013 ac Ionawr 2014. Mae’n cyflwyno adolygiad o sut a ble mae’r bwlch mewn perfformiad yn codi yn y broses codi tai. Gwnaed arolwg o lenyddiaeth ac ymchwil yn y maes, a datblygu proses o adolygu methodoleg i gasglu tystiolaeth yn uniongyrchol oddi wrth y timau codi tai, gan gynnwys ymweliadau â safleoedd adeiladu. Defnyddid y dystiolaeth yma i bennu blaenoriaethau a dynodi pa rai o’r mterion sy’n codi yw’r prif gyfrannwyr tuag at y bwlch mewn perfformiad.

Sut i archebu lle: Mae'r digwyddiad hwn yn rhad ac am ddim, ond rhaid i chi gofrestru o flaen llaw. Gyrrwch ebost at CEWales Digwyddiadau gan nodi eich manylion cyswllt yn llawn ac enwi pawb sy’n dymuno mynychu. Gallwch newid eich cynrychiolydd ar unrhyw adeg.

I ymaelodi â’r Clwb Arfer Gorau ewch i Dudalen y Dudalen y Clwb  am fwy o fanylion.

Bydd diffyg presenoldeb gan unrhyw aelod o'r clwb cofrestredig yn cael ei godi £20 oni bai eich bod wedi dweud wrthym erbyn Dydd Mawrth 17 Mehefin 2014.

Er mwyn lleihau gwastraff yn ein digwyddiadau, mae CEW yn gweithredu polisi o gadarnhau manylion y lleoliad ar ôl cofrestru’n unig. Bydd hyn yn sicrhau mai dim ond ar gyfer y rhai sydd wedi cofrestru y byddwn yn darparu ac nad ydym yn gor-archebu ar gyfer unigolion a allasai ddod heb archebu lle, neu rai nad ydynt yn troi fyny ar y diwrnod.


CEWales Gwefan

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