Building Regulations Part F: All You Need To Know About Trickle Vents

Confused about UK building regulations & trickle vents for windows? Learn how they improve air quality, prevent dampness, & comply with building regs.

At Dale Joinery, we’re passionate about crafting beautiful, high-quality timber windows that enhance your home. But windows play another crucial role beyond aesthetics: they contribute to a healthy and comfortable indoor environment. That’s where trickle vents come in.

What are trickle vents?

If you haven’t already read our article on ‘What Is a Trickle Vent & How Do They Work’, then let’s refresh your memory.  Trickle vents are small openings, usually found near the top of a window, that allow for continuous passive ventilation. They might seem insignificant, but they pack a big punch when it comes to maintaining good indoor air quality.

Why are trickle vents important?

Prevent condensation and dampness: By allowing fresh air to circulate, trickle vents help remove moisture from inside your home, reducing the risk of condensation and dampness problems.

Improve air quality: They remove stale air and pollutants like dust and cooking fumes, bringing in fresh air and creating a healthier living environment.

Boost energy efficiency: Proper ventilation can help regulate indoor temperature, potentially reducing your reliance on heating and cooling systems and saving you money.

New Building Regulations & Trickle Vents

Since June 2022, trickle vents have become mandatory for most replacement windows in the UK. This is because modern, energy-efficient windows can sometimes be too airtight, trapping moisture and pollutants inside. Trickle vents ensure proper ventilation even when windows are closed.

What Is Part F and Why Has It Been Changed?

Part F is a building regulation applicable to new construction projects or those leading to alterations or changes in the use of a dwelling. It establishes guidelines for the ventilation of both newly constructed and pre-existing buildings.

Part F was first introduced in 2010, and the reason it has changed is because of new issues that have been identified over recent years with the failure of homes to comply. In 2020, the Public Health England and World Health Organisation recognised that Part F was out of date.

Part F has undergone revisions to guarantee the continued provision of adequate ventilation levels.


Part F 2022 Regulation Guidance for Existing  & New Homes Overview.

Hinged or pivot windows must feature a specific opening size corresponding to the dimensions of the room, particularly for purge ventilation purposes.

If existing windows lack trickle vents, it is essential to show that the replacement windows will not exacerbate ventilation issues. Given that new windows often boast greater airtightness than older windows, there may be instances where the inclusion of trickle vents becomes necessary within the new replacement window frame.

When it comes to replacing windows, any existing trickle vents must be replaced. New windows must either include trickle vents or show that there is enough natural background ventilation. Trickle ventilation helps to reduce the moisture content of the air by allowing fresh air to enter the building. The lower the humidity in the building, the more effective and efficient the heating system will be.

How Does Dale Joinery Comply?

We understand the importance of trickle vents and offer the perfect trickle vent option to pair with your windows needs and preferences. Our windows can be fitted with discreet trickle vents that seamlessly blend with the overall design. We can also advise you on the best size and positioning for optimal ventilation in your home.

Benefits of Choosing Dale Joinery Windows With Trickle Vents

Improved indoor air quality and reduced risk of condensation.

Compliance with current building regulations.

The only supplier in the country that provides discreet and stylish designs.

Additional Tips for Maintaining Good Indoor Air Quality

Open windows regularly, especially during cooking and showering.

Use extractor fans in kitchens and bathrooms.

Dry wet clothes outside or in a well-ventilated room.

Invest in houseplants that naturally purify the air.

By taking these steps and choosing Dale Joinery windows with trickle vents, you can create a healthy and comfortable home for you and your family. 

Investing in trickle vents is an investment in the health and comfort of your home. At Dale Joinery, we’re committed to providing you with windows that not only look stunning but also contribute to a healthy living environment.  If you have any questions about trickle vents or our windows, please don’t hesitate to contact us today.