DOWNLOAD - Essential guide: New regulations U-value handbook: The latest updates to Part L Building Regulations

Building Regulations Part L addresses the conservation of fuel and power in new and existing homes in England. With buildings contributing about 40% of UK greenhouse gases, improving energy performance is crucial for reducing emissions and energy costs.

Key Updates to Part L Regulations

In June 2022, significant updates were made to Part L regulations to support the government’s net-zero target. The new rules emphasise a fabric-first approach and renewable technologies like heat pumps, aiming to reduce the carbon output of new homes by 31%. Standards for extensions and replacements in existing homes have also tightened.

To be exempt from these new requirements, projects adhering to the 2013 version of Approved Document L2A must have started on-site by 15 June 2023. These changes set the stage for the Future Homes Standard (FHS), which, starting in 2025, will require new homes to produce 75-80% fewer carbon emissions than those built to the previous standard.

Consolidation of Part L Documents

The updated Part L now consolidates into two documents:
- Approved Document L1 (ADL1): For new and existing domestic buildings
- Approved Document L2 (ADL2): For new and existing non-domestic buildings

These changes emphasise the importance of both fabric performance and low-carbon technologies in achieving energy-efficient homes.

Energy Performance Standards

The new standards, effective from 15 June 2022, set out detailed requirements for elements like floors, walls, and roofs, with a focus on improved insulation and reduced U-values. These standards are a precursor to the even stricter requirements anticipated under the Future Homes Standard in 2025.

For detailed energy performance standards, refer to the downloadable Part L regulations sheet HERE!

Interim Changes in Wales and Scotland

Wales: New amendments now require newly constructed buildings to follow the SAP 10 methodology and meet a minimum energy efficiency standard, aiming for an EPC rating of B or 81. Mandatory air-tightness testing is also required for new-build homes.

Scotland: Revised Section 6 energy standards apply to new building applications received after 1 February 2023. These updates aim to reduce carbon emissions by 32% compared to the 2015 standards and include mandatory airtightness testing and measures to address overheating risks.

Conclusion

The updated Part L regulations are a critical step towards achieving the UK's net-zero goals. By emphasising fabric performance and renewable technologies, these regulations aim to significantly reduce carbon emissions from new and existing buildings. Developers should familiarise themselves with these new standards and ensure compliance to contribute to a more sustainable future.

For more detailed information and to download the complete regulations here!