Passivhaus Affiliate

Future Homes - Future Buildings: call for evidence

The story so far

In January, the government published their response to last year’s consultation on Part L and Part F of the building regulations - read a review of the key points by LETI (the London Energy Transformation Initiative) here. The Trust welcomes in particular the decision to retain the Fabric Energy Efficiency Standard (FEES) and confirmation that local authorities will not be stripped of their ability to set stretching and locally applicable targets.

Your responses made a difference

Also in January, the government opened the second phase of this consultation process, seeking views on non-domestic buildings and, for domestic buildings, on their proposals on overheating, retrofit, the Fabric Energy Efficiency Standard, and changes to Part F (ventilation). Responses to this consultation could help shape the 2021 update to Part L and Part F that will be implemented in June 2022.

The deadline for responses to this consultation is 13 April.


Call for evidence

The Passivhaus Trust, in collaboration with LETI, is preparing a response and we need your help. Changes to Part L and Part F need to be evidence based, and certified Passivhaus projects provide a wealth of evidence demonstrating both the achievability and the positive effects of better fabric standards.

We’re asking PHT members and experienced Passivhaus practitioners to help build that evidence base.

One key area in which the government’s response lacked ambition is airtightness and heat recovery ventilation. It’s a missed opportunity, given the massive impact these two factors have on fabric heat loss – and also on indoor air quality. If you have data that could support the argument for better airtightness standards, including indoor air quality monitoring, we want to hear from you.

Ambition on airtightness and MVHR | Etude


Other areas in which LETI is building an evidence base include:

  • SBEM modelling
  • Space heating demand
  • Overheating
  • Not all homes are boxes
  • Residential modelling

Find out more and sign up to help via LETI’s website here, or email


Responding to the consultation

Numbers do count – the more people who let MHCLG know that we both need and can achieve better building standards, the better. However, copy and paste written answers are less useful, as they take time to review but don’t add anything new. So -

  • If you have 10 minutes:

Respond to the key questions - LETI and the Passivhaus Trust have identified 27 key questions (out of 130) in the current consultation to which short yes/no answers will be of value. Download our list of key questions here and the reasoning behind them here.

  • If you have more time:

Submit evidence - as described above.


Looking ahead

The building standards adopted for 2021 are only an interim measure, with more stringent targets set to follow as we aim for a zero carbon future. Evidence submitted now could also help shape the government’s approach to 2025 and beyond - the Future Homes Standard (for domestic buildings) and the Future Buildings Standard (non-domestic) will be published in 2024 and implemented in 2025.


Further information

The Future Homes Standard consultation: summary of responses and government response

The Future Buildings Standard consultation


Previous PHT story: PHT response: Part L/ Part F building regulations consultation - 29 January 2020

10th March 2021

Never miss UK Passivhaus news by joining the Passivhaus Trust mailing list Follow us on twitter @PassivhausTrust

< Back To News