Double glazing is something most of us take for granted—until it stops doing its job. If you’ve ever noticed a window in your home that’s misty, fogged up, or just not looking quite right, there’s a good chance you’re dealing with a blown glass unit. This is a common issue in homes across Dorset, Southampton, Frome, Bristol, Wareham, and Poole, and it can quietly affect your home’s energy efficiency, appearance, and even your comfort.
In this post, we’ll walk you through the 5 tell-tale signs that your double glazing has failed, explain what that really means, and let you know what to do about it.
Contact us TodayOne of the clearest signs of a blown unit is condensation or mist trapped inside the window. We’re not talking about the outside of the glass—that’s normal. But if you’re noticing droplets or a foggy layer between the two panes that you can’t wipe away, that’s a red flag.
Why does this happen? Because the seal has broken, allowing moisture to seep in. This means your double glazing isn’t doing its job of insulating anymore.
Even without obvious water droplets, blown units often look milky or foggy. This haze is caused by dirt and moisture entering the space between the panes. It ruins the clear view and makes your windows look permanently smeared, no matter how much you clean them.
If you’re typing “glass suppliers near me” or “glass cutting near me” into Google in frustration—you’re not alone. This is one of the most common reasons people call us at Clear Vision Glass.
When the inert gas (like argon) between the panes escapes and moisture gets in, it doesn’t just cause fogging—it can also cause discolouration. You might notice a grey, brown, or even yellowish tint in the glass, especially in direct sunlight.
Not only is this unsightly, but it also indicates your thermal insulation has failed.
Blown glass units don’t insulate as well as intact double glazing. So, if you’re feeling a chilly draft near a closed window, it could be because the unit is no longer providing a proper barrier.
This leads to higher heating bills, reduced comfort, and more strain on your central heating—especially in the colder months across the South West.
Another subtle but surprising sign of a blown unit is distorted reflections. If straight lines outside (like fences or frames) appear wavy when seen through the glass, there’s a chance your unit has failed.
This often goes unnoticed until someone points it out—but once you see it, you can’t unsee it!
Learn MoreThe good news? You don’t always need to replace the whole window. In most cases, we can simply replace the blown glass units—saving you money and keeping the existing frame.
Here’s what we recommend:
Check all your windows (especially older ones) for the signs above.
Don’t delay—blown units only get worse with time.
Get in touch with a trusted local expert (like us!) for a free inspection or quote.
At Clear Vision Glass, we’ve helped homeowners, landlords, and trade companies across Dorset, Southampton, Bristol, Frome, Wareham, and Poole solve blown unit issues quickly and affordably. Whether you’re searching for “glass cutting near me” or “glass suppliers near me”, we’ve got you covered with fast turnaround and expert care.
Ready to restore your view? Contact us today for advice or a no-obligation quote.
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