Proposed changes to Part L and F

The Government has recently published the consultation we have been eagerly anticipating for Part L (conservation of fuel and power) and F (ventilation) of the Building Regulations. The new standard, which once finalised is expected to be implemented fully by 2025 (with uplifts from 2020), will be called ‘The Future Homes Standard’.  It’s expected that an average semi-detached home built to the Future Homes Standard (2025) will result in 75-80% less carbon dioxide emissions in comparison to one built to the 2013 Part L requirements. The proposed timeline will see the 2020 uplifts come into force in mid/late 2020.

The proposals for the 2020 energy efficiency standards:
Option 1: Future Homes Fabric - 20 % improvement on CO₂ emissions through increased fabric standards
Option 2: Fabric plus technology - 31% improvement on CO₂ emissions though low-carbon heating and renewables
The preferred option is ‘Option 2’, although this is would have a higher build cost.

Other key points included in the consultation are;
•    Introducing primary energy as the main performance metric
•    Introducing a new ‘Household affordability rating’, likely to use the SAP rating
•    Removing the fabric energy efficiency metric (FEE)
•    Removing fuel factors from the target emission rate and introducing technology factors for district heating TER
•    Removing sample testing for air tightness and instead all homes will be tested
•    Addressing the performance gap by proposing photographic evidence for new dwellings
•    Tightening up of transitional arrangements, new standards would apply to all dwellings where the build had not started
•    The new standards will use SAP 10 – you can read more about the changes to SAP in Sava EDGE here.

The consultation will be running until 10th January and you can read it and respond here.