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  • The grace period for Part L 2022 came to an end on 15th June 2023 – Here is what you need to know! Approved Document L (Part L) sets the standards for energy performance and carbon emissions of dwellings and buildings other than dwellings. 

    Part L 2022 – takeaways!


    Approved Document L (Part L) sets the standards for energy performance and carbon emissions of dwellings and buildings other than dwellings. These regulations are updated periodically in line with advancements in technology and to ensure continuous improvement in energy efficiency and environmental sustainability. They apply to anyone involved in the design, construction, or renovation of buildings, including architects, builders, engineers, and other building professionals.

    Compliance with Part L is crucial. It covers various aspects, such as insulation, glazing, heating systems, ventilation, and renewable energy integration. Building professionals and tradespeople need to understand and adhere to the specific requirements outlined in Part L to ensure that buildings meet the prescribed energy performance standards.

    The recent update to Part L (June 2022) introduced new measures such as carbon emissions targets, energy efficiency standards, changes in assessment methodology, and the inclusion of primary energy metrics. These changes aim to further enhance the energy efficiency and sustainability of buildings in line with evolving standards and goals.

    The recent changes made to Approved Document L is the first step in achieving the Future Homes Standards which aims to ensure that, starting from 2025, new homes will generate 75%-80% fewer emissions.


    So, here are the 4 key takeaways that you need to be aware of regarding Part L in 2023:


    1. Emphasising Quality Construction that Strives for Lower Carbon Emissions

    2. Elevated Energy Efficiency Standards

    3. Updated Assessment Methodology

    4. Promoting Sustainable Construction Practices for a Greener Future

    1. Emphasising Quality Construction that Strives for Lower Carbon Emissions

    By ensuring meticulous attention to detail and employing robust construction techniques, such as maximising insulation, eliminating thermal bridging, and optimising airtightness, buildings can achieve higher energy performance and significantly reduce their carbon footprint. This focus on quality construction not only contributes to energy efficiency but also ensures the long-term sustainability and resilience of buildings.

    The regulations set a target of at least 31% reduction in carbon emissions for new homes compared to previous standards. Non-domestic buildings, on the other hand, are required to achieve a minimum reduction of 27%. This ambitious approach aligns with the broader global efforts to combat climate change and transition to a low-carbon future. By setting stringent targets for carbon emission reductions, the regulations motivate and challenge architects, builders, and developers to adopt innovative and sustainable construction practices. It underscores the urgency to prioritise energy-efficient design, materials, and technologies, ultimately leading to greener and more environmentally responsible buildings.

    Our products, such as our FAKRO insulation kits, can help conform to Part L standards. These add-on kits for your FAKRO rooflights are designed to meet the requirements for energy efficiency and reduced heat transfer, aiding in achieving the necessary carbon emission reductions. We prioritise testing methods to ensure our rooflights are of high quality and minimise heat transfer, thus contributing to improved energy performance and compliance with Part L regulations!


    1. Elevated Energy Efficiency Standards

    The new standards require walls, windows, rooflights, and doors to meet higher performance requirements, ensuring better thermal insulation and reduced heat transfer. Prioritising improved insulation and glazing, buildings can effectively minimise energy consumption and emissions, resulting in lower carbon footprints and reduced energy costs.

    A notable addition to the updated Part L regulations is the introduction of a new metric known as Primary Energy. This novel measurement serves as a comprehensive evaluation of heating efficiency and overall energy consumption within buildings. Unlike previous metrics that focused solely on electricity usage or carbon emissions, the primary energy metric considers the energy required for heating as well. By considering the complete energy picture, it offers a more holistic assessment of a building’s energy performance. The primary energy metric sets maximum limits for energy consumption, promoting the adoption of more efficient heating systems and encouraging a reduction in overall energy demand.

    Also, the updated regulations hold housebuilders and developers responsible for ensuring that their construction practices align with the new standards and contribute to improved energy performance. Regarding rooflights, the U-values are now calculated in the horizontal orientation, rather than the vertical orientation. Housebuilders and developers must proactively adopt practices that optimise insulation, minimise thermal bridging, and integrate energy-efficient heating, ventilation, and lighting systems.



    1. Updated Assessment Methodology

    The assessment methodology for new homes has shifted from SAP 2012 to SAP10. This updated procedure introduces a more comprehensive approach to calculating energy efficiency metrics and targets. Housebuilders now bear the responsibility of meeting these targets during the construction phase, encouraging them to adopt energy-efficient measures and technologies throughout the building process. By utilising SAP10, builders can make informed decisions and implement practices that enhance energy efficiency, ultimately leading to reduced energy consumption and carbon emissions in new homes.

    Another key aspect of the updated regulations is the requirement for photographic evidence at various stages of construction. Builders and developers are now obligated to provide visual documentation to demonstrate compliance with regulations and adherence to approved plans and standards. This photographic evidence acts as tangible proof of the construction progress, ensuring that it aligns with the prescribed guidelines. This shift emphasises the importance of accountability and transparency, enabling regulatory bodies to verify compliance and maintain quality control throughout the construction process.

    To further reinforce compliance, the regulations now necessitate a compliant SAP10 Building Regulations England Part L (BREL) report before a building can be completed. This report verifies that the construction aligns with the approved plans and regulations. It serves as an official record of compliance, supported by the inclusion of photographic evidence that substantiates adherence to regulatory standards. The mandatory nature of the SAP10 BREL report highlights the significance of thorough documentation and assessment to ensure that buildings meet the required energy efficiency standards and contribute to sustainability goals.


    1. Promoting Sustainable Construction Practices for a Greener Future

    The updated Part L regulations are designed to promote sustainable construction practices and foster a greener future for the building industry. With a stronger emphasis on energy efficiency and reduced carbon emissions, the regulations encourage the adoption of environmentally friendly materials and technologies throughout the construction process. By prioritising energy-efficient practices, such as improved insulation, optimised glazing, and the integration of renewable energy sources, builders can contribute to the reduction of greenhouse gas emissions and minimise the overall environmental impact of buildings. These updates align with the industry’s commitment to sustainability and pave the way for a more sustainable future.

    These changes not only benefit the environment but also contribute to creating healthier, more comfortable living and working spaces for occupants. By embracing sustainable construction practices, the industry can lead the way in shaping a greener future and creating buildings that are both environmentally responsible and economically viable!


    Contact us to learn more or to discuss a rooflight project, we’re happy to help.