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Part F and Part O changes to building regulations

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From June 2022, changes are being made to Building Regulations in the UK, as announced by the Department for Levelling Up, Homes and Communities (DLUHC) last December.

The changes are being introduced as a step toward achieving the 2025 Future Buildings Standards, which are supporting the country’s commitment to delivering net-zero carbon emissions by 2050.


The Amendment Regulations to Approved Document F: Ventilation came into effect on 15th June 2022. This is a Building regulation that applies in England. It includes guidance to meet the requirements of Part F1(1) of Schedule 1 to the Building Regulations 2010.

“The aim of requirement F1(1) is to protect the health of occupants of the building by providing adequate ventilation. Without adequate ventilation, mould and internal air pollution might become hazardous to health.”

– Approved Document F, Volume 1

The guidance in Approved Document F, Volume 1 applies only to dwellings. Alternatively, the guidance in Approved Document F, Volume 2 applies to buildings other than dwellings and for blocks of flats with shared communal rooms.

The guidance set out in Approved Document F includes (but is not limited to):
  • The noise of ventilation systems
  • Installation of ventilation systems and access for maintenance of ventilation systems
  • Performance-based testing and guidance, inspection standards
  • Extract ventilation, Whole-dwelling ventilation, and Purge ventilation
  • Ventilation systems for basements
  • Continuous mechanical extract ventilation and mechanical ventilation with heat recovery
  • Minimising the ingress of external pollutants
  • Control of ventilation intakes and location of exhaust outlets
  • Installing energy efficiency measures
  • Addition of rooms to existing dwellings and refurbishment of rooms to existing dwellings
  • Air flow rate testing and commissioning of ventilation systems

The regulations will not apply to building work where a building notice or an initial notice has been given to a local authority before 15 June 2022 (provided that the building work is started before 15 June 2023).

Find the full Building Regulation Document F here.


Another Building Regulations document that took effect in June 2022 is Part O: Overheating. This is a Building regulation in England which sets standards for overheating in new residential buildings.

“This Approved Document covers the overheating mitigation requirements of the building regulations as set out in Part O of Schedule 1 to the Building Regulations and in a number of specific building regulations. Technical guidance is contained in Approved Document O. Approved Document O applies to new residential buildings.”


The guidance set out in Approved Document O includes (but is not limited to):
  • Categorising residential buildings
  • Strategies for reducing the risk of overheating – limiting solar gains and removing excess heat
  • Dynamic thermal modelling – methods and limitations
  • The usability of the overheating mitigation strategy – noise, pollution, security, and protection from falling and entrapment
  • Regulation 4B of the 2010 Building Regulations – information, intention, and user guide

Approved Document O does not apply to work subject to a building notice, full plans application or initial notice submitted before 15th June 2022 (provided the construction work has started before 15 June 2023).

Find the full Building Regulations Document O here.


“The Building Regulations are key to ensuring that all new buildings, as well as buildings undergoing refurbishment, are constructed to a high standard so as to meet high levels of energy efficiency as well as maintain high safety standards for their occupants. The Approved Document F in particular focuses on ventilation. In recent years ventilation has been front and centre of public discourse around health and safety, both at home and within the workplace, in efforts to improve the quality of the air we breathe. Alongside the concerns around air quality, there is also a pressing need to improve the energy efficiency of buildings to help with the government’s aim of hitting net-zero carbon emissions by 2050.

The Approved Document F has been updated with these issues in mind. It now includes extra provisions for the energy efficiency goals of new and refurbished buildings while ensuring that the air quality is improved. An example of this is with changes to the minimum standard for trickle vents within dwellings. This intends to improve natural ventilation to ensure ‘bad’ air is expelled from the building faster, where mechanical ventilation is not a suitable option. The changes are also being made to try to simplify the regulations. This is because there is evidence to suggest that the regulations are not being followed as a result of their over-complication.”

– Ryan Brookes, Pre-Construction Manager at Celsius Solutions


Let us know how you’re being affected by the new changes to building regulations.
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