Can you add trickle vents to sash windows?

Author: Hardy Zieme PhD  |  Last update: Friday, January 30, 2026

To put it simply, yes! The Rose Collection has authentically adapted to the new building regulations. Read on to learn more about the benefits of trickle vents on our uPVC sliding sash windows range!

Can sash windows have trickle vents?

Ventilation is an integral part of keeping any building in good condition. Proper ventilation is now a requirement for all UK homes under the latest building regulations standards. That's why trickle vents should definitely be fitted in all uPVC sash windows.

Can trickle vents be added to existing windows?

Yes! it is possible to retrospectively fit trickle vents in windows and doors. If you are experiencing a problem like condensation and don't have another form of background ventilation, you could consider fitting trickle vents to your existing windows and doors.

Can trickle vents be fitted to existing windows cost?

The price to install a trickle vent can change based on things like the type of window and the fees from the installer. Usually, homeowners should plan to spend around £30 to £80 for each new trickle vent, which includes the installation fee.

How to stop condensation on old sash windows?

You can do this by:
  1. Raising the temperature, as condensation occurs when warm air hits cold surfaces (in this case your windows)
  2. Turning down any humidifiers in use.
  3. Buying a dehumidifier to reduce moisture levels.
  4. Making sure you use bathroom and kitchen fans.

What are Trickle Vents? Do you need them?

How do you make old sash windows warmer?

1 How to reduce heat loss

Draught proofing is the most effective solution to keeping warmth trapped inside and should be your first goal. Aim to keep windows in good repair in the first place – frames that have warped or no longer fit well will let in draughts. Close shutters and curtains at night to reduce heat loss.

Should you wipe condensation off windows?

Should You Wipe Condensation Off Windows? Yes, wipe off any condensation on your windows with a soft microfibre cloth.

What are the disadvantages of trickle vents?

The Disadvantages of Trickle Vents:

Trickle vents, particularly when open, can increase noise pollution in the home by creating an opening in the sealed window. Maintenance: All windows require regular maintenance throughout the year, particularly during Spring cleaning.

What is the alternative to trickle vents?

Mechanical ventilation with heat recovery (MVHR) is a suitable alternative to getting trickle vents. It uses heat from outgoing air to warm up any incoming fresh air without compromising the quality.

Can spiders get in through trickle vents?

Spiders don't wait for you to come home from work or the school pick-up and then stroll through the front door, hoping you won't see them. They're a little more ambitious. They'll come through open windows, trickle vents (the narrow plastic openings above windows used to control air flow) and exterior air bricks.

Why do my new windows not have trickle vents?

According to current building regulations, it is only mandatory to install trickle vents within a replacement window or door if there was already a vent present in it originally.

Can you fit trickle vents yourself?

Trickle vents are designed to cut condensation, both on the inside of the windows, and on the walls. Older windows tend not to have trickle vents, but that doesn't mean you have to replace perfectly good glazing. You can retrofit trickle vents fairly easily, providing you're competent at DIY.

Do trickle vents stop condensation?

Trickle vents are designed to allow a small amount of 'background' air circulation. This will assist in reducing condensation, damp and mould inside properties especially around windows as these are normally the coldest place in a room so therefore the first place that condensation will form.

What are the new regulations on trickle vents to windows?

Any windows installed after the 15th June 2022 will have to comply with the new trickle vent regulations. The aim of these new regulations is to ensure every home receives adequate ventilation through trickle vents that have to be positioned in the upper frame of a window or door.

What is a window sash vent?

Sash Vent Locks:

Specially designed for double-hung windows, sash vent locks limit the opening of both the top and bottom sashes, providing a secure barrier against falls.

Are sash windows air tight?

While traditional sash windows may not achieve the same level of airtightness as some modern window types, advancements in design and technology have significantly improved their performance. With proper installation and quality weather stripping, modern sash windows can create a reasonably airtight seal when closed.

Do you lose heat through trickle vents?

The potential for trickle vents to cause heat loss is a common concern, but the amount of heat that trickle vents actually allow to pass through is very minimal, and doesn't enable a lot of heat to escape.

How much does it cost to fit trickle vents?

Generally, depending on quality and features, they can range from £15 to £40 per vent. For through-frame, over-frame, or glazed-in options, the costs typically fall between £15 to £25 per window. Additionally, the cost may differ for new installations versus retrofitting an existing window.

Can trickle vents be fitted retrospectively?

No, you do not need to replace your windows to install trickle vents. Trickle vents can be retrofitted to existing uPVC windows by drilling holes in the frame and securing the vents in place.

Should I leave my trickle vents open in winter?

Trickle vents prevent mould and condensation build up by allowing a controlled amount of air to escape the window, so we do recommend keeping them open throughout winter. The calling of the internal temperature in winter from a trickle vent is quite marginal.

Can bugs get through trickle vents?

No. Trickle vents have insect screens that prevent bugs and dirt from getting through. Should trickle vents be installed in commercial buildings? Background ventilation like trickle vents are required in commercial spaces.

What is the alternative to trickle ventilation?

Passive Wall Ventilation

They do not need a power supply, so can be located anywhere in the room, generally at high level. Passive wall vents are generally far superior to using window trickle vents.

Why are my windows full of condensation every morning?

It's quite common to see levels of condensation on your windows, ESPECIALLY IN THE MORNING! This happens when the temperature outside drops overnight. It clears as the temperature warms up as the day goes on. This is caused by the humidity in your home, NOT because of the windows.

What is the best hack to stop condensation on windows?

Jamie adds, 'You simply fill a small bowl with baking soda and place it on the window sill. Over time you will notice the baking soda will harden as it absorbs the moisture. If this happens, replace it with fresh baking soda. '

Does white vinegar stop condensation on windows?

Unfortunately, the answer is no. While vinegar does have disinfecting and deodorising properties that can clean and remove built-up condensation from windows, it does not provide a long-term solution to stopping condensation.

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