Latest Updates

Document F and Trickle Vents

On the 15th of December 2021, the updated guidance to Approved Documents F, L & O of the Building Regulations were published. The changes to Approved Document F – Background Ventilation, now require the majority of replacement windows and doors to be fitted with trickle vents as standard.

When Are The Changes Coming Into Effect?

window trickle ventThe changes come into effect on the 15th of June 2022 and affect England ONLY, with no current changes to the Building Regulations in Wales.  It is also important to note that the date on which a contract is signed by customers has no bearing on the registration of the work with FENSA. IE. If the window or door installation takes place from the 15th of June 2022 onwards it will be expected to comply with these new building regulations.


There are certain exemptions that can be considered for these new rulings and relate to Listed Buildings, conservation areas and other historic buildings.

trickle vent updates

What Size Trickle Vents Should Be Specified?

RoomMinimum equivalent area of background ventilators
Habitable Rooms8000mm²
Bathroom with or without a WC4000mm²
Utility RoomNo Minimum


Of course, we will be fully compliant with any necessary changes for window and door installation, staying on top of any regulations as they change. When you speak to us, we will advise you on what’s needed for your specific installation to ensure you comply.