Building Regulations Part L and F Review (Wales)

    The Welsh Government has released a consultation for Building Regulations Part L (conservation of fuel and power) and Part F (ventilation) for new dwellings. 

    Background

    The Welsh Government is determined to reduce greenhouse gases in Wales, and have brought forward legislation in 2020 to adopt a new carbon reduction target of at least 95% by 2050. Further to this the, Welsh Government will continue to work with industry stakeholders to explore how they can set a net zero carbon target.

    On 19th December 2019, the Welsh Government released its consultation for Part L (Conservation of Fuel and Power) and Part F (Ventilation) which proposed changes to Building Regulations for new homes as well as the guidance which accompanies them. The changes put forward within this consultation will aim to future-proof new homes for the introduction of low carbon heating systems and will also aim to make homes more energy efficient by improvidng compliance and overall performance.

    An overview of the consultation has been provided below.

    Consultation Information

    Consultation Name

    Building Regulations Part L and F Review - Link here

    Consultation Release Date

    Thursday 19th December 2019

    Published by

    Welsh Government

    Response Deadline

    Thursday 12th March 2020 - Respond here

    Link to Elmhurst Response

    timer-icon Pending

    Future Part L 2025 onwards

    High fabric standards will play a significant role in limiting heat loss and reducing the demand for heat, however in order to meet the government’s ambition, high fabric standards will need to be coupled with a low carbon heating system. The low carbon heating systems which can support this scale of change include the use of heat pumps (particularly air-to-water and air-to-air), heat networks and in some circumstances direct electric heating. Other technologies such as hydrogen may have a role to play in future heating systems

    It is anticipated that an average semi-detached house built to meet the Part L 2025 standard would produce 75-80% less carbon dioxide emissions than ones built to the 2014 Part L requirements.

    Part L 2025

    Part L Standards for New Dwellings in 2020

    The Consultation proposes a considerable uplift to energy efficiency standards in 2020, which would be used as a stepping stone to the Future Part L 2025 standard. The Consultation proposes two options for uplifting energy efficiency standards in Part L in 2020:

    Option 1- 37% improvement on the current Part L standard: This performance standard would be achieved through high fabric standards, a natural ventilation system, and additional measures to further reduce energy demand. This would add approximately £5,900 to the current build cost but would save households an estimated £180 a year on energy bills.

    Option 2- 56% improvement on the current Part L standard: This performance standard would be achieved similarly to option 1, but will likely adopt mechanical ventilation with heat recovery (MVHR) or provide greater encouragement for low-carbon heating. Meeting this standard would add £8,300 to the current build cost and would save households an estimated £190 a year on energy bills.


    The government prefers option 1 as their 2020 'stepping stone' for the Part L 2025 standard.


    Additional changes to Part L in 2020

    New Performance Metrics

    Changes to Airtightness

    Improving Compliance

    Additional Proposals

    You can view the consultation version of Approved Document L by clicking below

    VIEW DRAFT PART L GUIDANCE >

    Changes to Part F (Ventilation)

    Chapter four of the consultation delivers proposed changes to Approved Document F (Ventilation), this includes the following:

  • simplifying the structure and content of guidance relating to Part F
  • simplifying the process for determining the ventilation rate and system design required for new build homes
  • providing information to educate building owners about their ventilation systems. A copy of the completed Appendix C would satisfy this requirement
  • reviewing the way that ventilation systems are presented in Part F to reflect typical design practices

  • You can view draft guidance for Approved Document F by clicking below

    VIEW DRAFT PART F GUIDANCE >

    Consultation Information

    Consultation Name

    Building Regulations Part L and F Review - Link here

    Consultation Release Date

    Thursday 19th December 2019

    Published by

    Welsh Government

    Response Deadline

    Thursday 12th March 2020 - Respond here

    Link to Elmhurst Response

    timer-icon Pending
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