Welsh Building Regulations Part L and F consultation released

The Welsh Government yesterday released its consultation on the future of energy efficiency and ventilation within new build homes where they have set some ambitious targets which go beyond those proposed for England.

The Welsh Government states: 

“This consultation sets out our plans to improve the energy efficiency requirements for new homes in 2020. The document also provides detail on the direction of travel for energy efficiency requirements for introduction in 2025.”

 “This document is the first stage of a two-part consultation about proposed changes to the Building Regulations. It also covers the wider impacts of Part L for new homes, including changes to Part F (Ventilation), its associated Approved Document guidance, airtightness and improving as-built performance of the constructed home.”

The consultation is similar in ways to the Future Homes Standard consultation released for England in October this year, but there are some key differences.

The main highlight is that the there is a clear direction of travel to 2025 and that the 2020 new standards will be a meaningful step on this journey for new homes in Wales.

Headlines of the Consultation

  1. There are 2 options to uplift the Part L standards in terms of carbon emissions:

    Option 1:
     37% reduction in carbon emissions
    Option 2: 56% reduction in carbon emissions

  2. There are proposed changes to Part F in terms of simplifying the documents and guidance
  3. There are proposals to perform an Air tightness test on all homes
  4. More stringent transitional arrangements to ensure all homes are built to new standards


The Welsh Government has also set out their aims for the coming year

Early 2020: Release consultations on overheating in new dwellings, energy efficiency work in existing homes & non-domestic buildings, and the energy efficiency regulations of non-domestic building.

12th March 2020: Part L Consultation Closes 

Early/Mid 2020: Publish the new Part L and F overheating regulations

Mid/Late 2020: Part L, F and overheating regulations come into force


Elmhurst, as always, will work with our expert members to develop a considered response to this important consultation. There is a lot of detail provided within the consultation and over the coming days and weeks we will undertake a full analysis of it, with our findings and observations included.

Stuart Fairlie Technical and Operations Director at Elmhurst, comments: “We are delighted to see the consultation from the Welsh Government, we have already formed a draft response to the English Future Homes Standard consultation, and so we look forward to analysing the key differences proposed by Wales and will work with our members, before replying. The ambitious steps proposed are more adventurous than England, and also ensures that homes built in Wales will be more energy efficient. The vision is very clear and we look forward to working with the Welsh Government and our members to deliver these homes.”

Link to Consultation: https://gov.wales/building-regulations-part-l-review-0

This consultation is supported by other documents including: SAP10.1, Approved Documents L and F (consultation versions) & impact assessment.

The deadline for responses is 12th March 2020.

Article published 20th December 2019

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