Why Are My Sash Windows Letting in Cold Air?

If your sash windows are letting in cold air, you’re not alone. This is one of the most common issues we see in traditional timber windows, particularly in period properties.

At Brown’s Sash Windows Restorations, we regularly help homeowners across Retford, Nottinghamshire and surrounding areas resolve draught problems while preserving their original windows.

In most cases, cold air entering through sash windows is caused by wear over time rather than a fault in the design itself.

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Common Causes of Cold Draughts

There are several reasons why sash windows may allow cold air into your home.

Gaps Around the Sashes

Traditional sash windows were not originally designed with modern draught seals. Over time, small gaps can develop between the moving parts of the window and the frame.

These gaps allow cold air to pass through, especially during windy weather.

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Worn or Missing Draught Proofing

Older windows often have no draught proofing at all, or any existing seals may have worn away over time.

Without proper sealing, even well-maintained windows can feel cold.

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Poorly Balanced Windows

If sash cords are worn or the weights are not correctly balanced, the window may not sit properly within the frame. This can create uneven gaps where air can enter.

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Timber Movement and Age

Timber naturally expands and contracts with changes in temperature and moisture. Over many years, this movement can lead to slight misalignment, allowing draughts to develop.

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Why It’s Worse in Winter

Cold air entering through sash windows becomes more noticeable during colder months, particularly when:

• strong winds push air through small gaps

• temperature differences increase airflow

• heating systems highlight cold spots

This can make rooms feel uncomfortable and harder to heat.

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How Brown’s Fixes Draughty Sash Windows

At Brown’s Sash Windows Restorations, we typically resolve this issue through professional servicing and draught proofing.

Our approach includes:

• restoring smooth operation of the sashes

• ensuring windows are correctly balanced

• installing discreet draught proofing systems

• sealing gaps without affecting appearance

This allows the window to retain its traditional look while significantly improving comfort.

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Benefits of Draught Proofing

Once draught proofing is installed, homeowners often notice an immediate difference.

Benefits include:

• reduced cold air entering the property

• improved warmth and comfort

• quieter windows in windy conditions

• better overall energy efficiency

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Preserving Your Original Windows

Many homeowners consider replacing sash windows when they experience draughts. In most cases, this isn’t necessary.

With the right restoration work, original timber sash windows can perform well while maintaining the character of the property.

Sash Window Specialists in Nottinghamshire

At Brown’s Sash Windows Restorations, we work with homeowners across Retford, Nottinghamshire and the surrounding areas, restoring and repairing traditional timber sash windows. From draught proofing and sash cord replacement to full restoration and double glazing upgrades, our aim is always to preserve original windows while improving their performance and comfort.