Draughty Windows – Causes, Solutions, and How to Keep Your Home Warm

When cold air sneaks in through gaps in your windows, it forces your heating system to work harder, leading to higher energy bills and an uncomfortable living environment. Fortunately, you don’t have to live with draughty windows. Simple repairs and draught-proofing solutions can stop cold air in its tracks, helping you save money and keep your home cosy all year round.

What Causes Draughty Windows?

Draughts usually come from specific, identifiable sources. Here are some common causes of draughty windows:

Gaps in Window Frames

Over time, wear and tear or poor installation can cause small gaps to develop between the frame and the wall, letting cold air seep into your home. Wooden sash windows, in particular, can expand and contract with the seasons, making them more susceptible to gaps forming. A poorly sealed frame allows cold air in and can also lead to higher energy bills, as your heating system works overtime to maintain a comfortable temperature.

Damaged Window Seals

The seals around your window – whether they are made of silicone, rubber, or another material – are there to keep air from moving between the inside and outside of your home. Over time, these seals can degrade, especially in older sash windows. Cracked or shrinking seals leave small but significant openings where draughts can easily enter. This is particularly common in older windows that have not been maintained properly. Checking and replacing damaged seals can be an effective solution to stopping unwanted airflow.

Poorly Fitted or Worn-Out Windows

Older windows may no longer fit snugly into their frames, especially if they’ve been in place for many years. In some cases, improper installation from the start can lead to windows that don’t sit squarely in their frames, creating gaps and allowing draughts to flow through. Sash windows that are old or have warped over time are particularly prone to this issue, leaving gaps that allow cold air in. If your windows are difficult to close or you can see light around the edges when they’re shut, you likely have a fitting issue that needs addressing.

Broken or Ineffective Locks

Windows that don’t close or lock properly can be another cause of draughts. A broken or ineffective lock may prevent the window from closing tightly, leaving small gaps around the edges. Even the tiniest gap can let in a noticeable draught. Make sure to check your window locks regularly to ensure they are functioning as intended and replace them if they are not.

4 Signs That You Have Draughty Windows

Draughty windows can be subtle, but there are a few key signs that can help you identify if your windows are letting cold air into your home. By spotting these early, you can take action to improve your home’s comfort and reduce energy waste.

1. Feeling Cold Air Near Closed Windows: This is particularly common with older sash windows or worn-out frames. If you notice a chill when standing near your windows, it’s likely there are gaps allowing cold air to seep in.

2. Increased Energy Bills: As warm air escapes and cold air enters through gaps in your windows and doors, your heating system has to work harder to maintain a comfortable temperature, leading to higher energy usage and costs.

3. Visible Gaps or Shrinking Seals: Silicone seals or rubber strips can deteriorate over time, leaving small but significant openings that allow air to pass through. These gaps are often easy to spot and can be addressed with simple repairs.

4. Rattling Windows: Windows that rattle or shake when the wind blows are often a sign that they don’t fit securely in the frame. This indicates that gaps are present, letting cold air in and making your home less energy-efficient.

How to Fix Draughty Windows

There are plenty of effective methods available to stop cold air from creeping into your home. Here are some tried-and-true options for draught-proofing your windows:

Use Adhesive Foam Strips

One of the easiest and cheapest ways to seal minor gaps in window frames is by using adhesive foam strips. These self-adhesive strips are readily available at most DIY stores and are simple to apply. Just peel off the backing and press the foam into place along the window frame. Adhesive foam strips are especially effective for small gaps that may not need a more extensive solution. While this is a temporary fix, it’s great for homeowners looking for a quick and cost-effective way to stop draughts.

Install Wiper Strips or Plastic Strips with Brushes

For more robust draught-proofing, installing wiper strips or plastic strips with brushes is an excellent option. These strips are designed to create a tighter seal around your sash windows, preventing draughts from getting through. The strips work by closing the gaps between the window and its frame while allowing the window to still open and close smoothly. These products are available at most DIY stores and are relatively easy to install, making them a perfect DIY project for homeowners looking to stop draughts without spending a fortune.

Apply Silicone Sealant

If the seals around your windows have cracked or shrunk, silicone sealant can be a simple and effective solution. Over time, seals can deteriorate, especially in older windows, creating gaps that let cold air in. To fix this, apply a fresh bead of silicone sealant around the edges of the window where the frame meets the glass or wall. Silicone sealant is flexible and waterproof, making it ideal for sealing up small gaps and preventing further draughts. Just make sure to use a sealant gun to apply the product smoothly and evenly.

Professional Draught-Proofing Kits

These kits typically include high-quality materials like rubber seals, wiper strips, and brush strips that are designed to fit specific window sizes. These kits provide a more durable and long-lasting fix compared to DIY products and can be especially useful for older sash windows that are more prone to draughts. 

While you can install many of these kits yourself, hiring a professional to ensure a perfect fit can further strengthen the energy efficiency of your windows.

Upgrade to Double Glazing

If your windows are still single-glazed, they are likely responsible for a significant amount of heat loss. Double glazing consists of two panes of glass with a layer of insulating gas in between, which helps keep heat inside and cold air out. Double-glazed windows are a worthwhile investment for homeowners looking for a long-term solution to draughty windows.

Double Glazing Sash Windows

Consider Secondary Glazing

Secondary glazing involves adding an additional pane of glass to the inside of your existing windows, creating an extra layer of insulation without altering the external appearance of the building. This method is particularly useful for historic properties where maintaining the character of the original windows is important. 

Secondary glazing can significantly reduce draughts and improve energy efficiency, all while complying with conservation requirements.

Secondary Glazing Installation

Leave It to the Experts

Our team specialises in bespoke sash windows designed to fit your home perfectly, eliminating draughts and improving energy efficiency. Our team of experts handles everything from the initial consultation to the precise installation, ensuring a flawless, draught-free fit.

Why Installing Energy-Efficient Windows is the Best Long-Term Solution

While DIY fixes and draught-proofing methods can provide short-term relief, upgrading to double-glazed windows ensures long-lasting comfort, improved home efficiency, and increased property value.

Reduce Energy Bills

Energy-efficient, double-glazed windows are designed to significantly reduce heat loss through your windows, helping you save money on your energy bills. With two panes of glass and an insulating layer of gas between them, double glazing keeps warmth inside your home while blocking out cold air.

Given that up to 35% of a home’s heat can be lost through windows, installing energy-efficient windows is one of the best ways to reduce your household energy usage.

Improved Comfort

By installing double-glazed or energy-efficient windows, you can say goodbye to draughts for good. These windows provide an effective barrier against cold air, keeping your living space warmer and more comfortable throughout the year. Another upside is effective noise reduction, making your home quieter as well as cosier.

Enhanced Property Value

Buyers are increasingly looking for homes with sustainability features, and energy-efficient windows are a key selling point. By upgrading your windows, you can improve your own quality of life while also making your home more appealing should you decide to sell in the future.