Everything You Need To Know About The Upcoming Changes On Ventilation Regulations

On 15th June 2022, the UK government is launching the next phase of its ‘Future Homes’ strategy. Included are significant changes to ventilation requirements. Here’s everything you need to know. 

What Is The ‘Future Homes’ Initiative?

The government has committed to reducing carbon emissions from new homes by 78%, and it hopes to achieve this by 2025. As part of the broader plan to adhere to the Paris Accord international climate treaty, it involves tackling areas of thermal inefficiency that lead to increased energy consumption. 

What Role Do Windows Play In ‘Future Homes’?

Windows are major contributors to heat loss. The Energy Saving Trust suggests that homeowners can reduce the carbon footprint of a typical semi-detached property by up to 410kg simply by installing A++ rated double glazing. However, reducing air permeability can lead to problems with ventilation, which is why Part F Building Regulations 2021 are replacing the earlier 2013 version.  

What Are The Part F Building Regulation Changes?

The changes relate to five main areas: 

  1. Intermittent extract rates
  2. Continuous extract rates
  3. Whole dwelling ventilation rates
  4. Background ventilators
  5. Purge ventilation

Not all these areas have major differences from the existing 2013 document. Both intermittent and continuous extract rates – which relate to kitchens, utility rooms, and bathrooms – remain unchanged. Intermittent extract rates are a standard 30l/s for kitchens and bathrooms (60 l/s if the extractor is away from the hob), and continuous extract rates are 13 l/s for kitchens, 8l/s for utility rooms and bathrooms, and 6 l/s for bathrooms. Additionally, purge ventilation remains the same at 4 air changes per hour. 

Whole Dwelling Ventilation Rate

Under the 2021 Part F Approved Document, homes must have a significantly higher ventilation rate. The internal floor area requires 0.3 l per second per m2, while the number of bedrooms must also be considered, with the minimum ventilation rate as follows:

  • 1 bedroom = 19 l/s
  • 2 bedrooms = 25 l/s
  • 3 bedrooms = 31 l/s
  • 4 bedrooms = 37 l/s
  • 5 bedrooms = 43 l/s

Any additional bedrooms can be calculated by adding 6 l/s. 

Background Ventilators

In the previous Building Regulations document, background ventilation was calculated based upon the total floor area and number of bedrooms. In the new 2021 Part F Approved Document, this has changed to the type and purpose of the room. Habitable rooms and kitchens in multi-floor properties require 8000mm2, while the same rooms in single-floor dwellings require 10,000 m2. Bathrooms require 4000mm2 regardless of the number of storeys, which is an increase on the previous 2500mm2. There is no minimum for utility rooms or sanitary accommodation. Part F cautions that to ensure compliance, expert advice should be sought in all but the most generic builds. 

How To Meet The New Building Regulations

Meeting the new changes should result in homes that are more comfortable, healthy, and efficient. However, ensuring that the requirements are met may be a challenge. At Mila Maintenance, our window and ventilation experts can offer guidance, advice, and help with calculations. For guaranteed compliance, speak with one of our experienced advisors today. 


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