Eco Sash & Case News

5 Common Myths About Sash Windows, Debunked

Myth 1: “Sash Windows Are Always Draughty”

Older sash windows with worn weatherstripping, warped sashes, or gaps around the frame can absolutely let draughts through. But this is usually about wear and maintenance, not an inherent flaw in the design.

The reality: Modern draught-proofing techniques and proper sash refitting can make even century-old timber sash windows draught-free. 

Myth 2: “You Have to Replace the Whole Window If Anything’s Wrong”

It’s a common assumption that a problem with a sash window means the entire thing needs replacing.

The reality: Many issues such as a broken cords, worn pulleys, cracked putty, localised rot, are entirely repairable without the need for a full replacement. 

Myth 3: “Double Glazing Isn’t Possible in Sash Windows”

Some people assume that upgrading to double glazing means giving up the sash window look entirely.

The reality: Slim double glazing units are specifically designed for period properties, fitting within traditional sightlines while offering real improvements in thermal and acoustic performance.

Myth 4: “Sash Windows Don’t Last as Long as Modern Alternatives”

Given their how long sash and case windows have been around, it’s easy to assume sash windows are less durable than newer window styles.

The reality: Well-maintained timber sash windows can last well over a hundred years, often outlasting modern uPVC units, which typically need full replacement after a few decades. 

Myth 5: “Restoring Old Sash Windows Costs More Than Replacing Them”

Because “restoration” sounds like specialist, premium work, people sometimes assume it’s automatically pricier than replacement.

The reality: In many cases, restoring existing frames costs less than a full replacement, especially if the frame itself is structurally sound. Replacement tends to make more financial sense only when damage is extensive or the existing frames are beyond practical repair.

Why These Myths Matter

Getting an honest, informed assessment of your specific windows is the best way to cut through the myths and make a decision that actually fits your property and budget. Book a Survey

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The Homeowners’ Guide to Repairing and Replacing Sash & Case Windows, Sustainably
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