Upcoming changes to Part L & F

What this means - Future Homes Standards


The UK has set up a target to bring all its greenhouse gas emissions to net zero by 2050. As part of this journey Government has launched the first stage of consultation on how to achieve Future Homes Standards for “2025” It is expected that an average new-built home will produce 75- 80% less CO2 emissions than those built to the current standards. The Government is immediately looking to uplift current energy requirements in 2020 as part of the progress.


• Option 1:
• To implement 20% reduction in carbon emissions compared to the current energy standards
• Use of very high fabric -typically triple glazing, very thick fabric (wall, ceiling, floor)
• Option 2:
• To implement 31% reduction in carbon emissions compared to the current energy standards
• Use of carbon-saving technologies, better fabric standards-typically double glazing instead of triple,

Option 2 is the Government’s preferred option as it will deliver more carbon saving and lower fuel bills compared to the project build cost. The Government expects heat pumps to dominate the heat market so these early stage preparations will help the supply chain, and increase the number of trained installers in the market.

The Government consultation plan is proposing to revise approved documents Part L and F for better standards. Some key changes:

• Changing the whole building’s minimum energy performance targets.
o primary energy to be the principal performance metric and CO2 to be secondary metric
o Removing fabric energy efficiency metric
o Incorporating the latest evidence on primary energy and CO2 emissions
o Removing fuel factors for high carbon fossil fuels
o Introducing householder affordability standard for new dwellings

• Taking a significant interim step towards future homes:
o Uplifting the minimum building energy performance standards
o Improving the minimum insulation standards
o Improving the minimum efficiencies of building services items
o Future proofing new dwelling for low carbon heating system

• Simplifying the approach for determining the ventilation rate and system design
• Bringing in guidance on how to reduce ingress of external air pollutants
• Making technical changes to ventilation system guidance using the latest evidence and understanding
• Reviewing airtightness testing methodology
• Reflecting uncertainty of air test results in SAP
• Overheating revised strategy

The consultation plans also sets out the proposal for changes to the transitional arrangements to encourage quicker implementation of the new energy efficiency requirements. It also proposes to remove the ability of local planning authorities to set higher energy efficiency standards to create certainty and consistency.

These initial consultation mainly relates to the new domestic buildings but there will be a further consultation in the coming months for existing domestic and commercial buildings.

Please get in touch with me if you would like to discuss this further – I am here to help.

S Khalique
Technical Director
BEng, MSc


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