Ah, spring — the season of longer evenings, warmer weekends, and the sudden realisation that your double glazing has gone cloudy overnight. If you’ve noticed a misty haze appearing inside your windows just as the weather starts to improve, you’re not alone. It’s one of the most common calls we get at Window Geeks every March and April, and the good news is it’s almost always fixable without replacing your whole window.
But before we get into solutions, it helps to understand what’s actually going on — because not all window condensation is the same, and only one type actually needs sorting.
The three types of window condensation
Most people assume all misty windows are a problem. They’re not. Here’s how to tell them apart:
Condensation on the outside of the glass — This is actually a sign your windows are working well. Modern energy-efficient glass is so effective at keeping heat inside that the outer pane stays cold, and on cool mornings moisture in the air condenses on the surface just like it does on a cold can of drink. It clears as the day warms up and needs no action from you.
Condensation on the inside surface of the glass — This is a ventilation issue in your home, not a window fault. Common in kitchens, bathrooms, and bedrooms, especially first thing in the morning. Better airflow — extractor fans, trickle vents, briefly opening a window — usually sorts this.
Condensation between the two panes of glass — This is the one that needs attention. If the mist is sitting inside the sealed unit and doesn’t clear during the day, the hermetic seal around your double glazing has broken down. Moisture has got in, and it won’t come out on its own. This is what we fix.
Why does it seem to get worse in spring?
Spring is the perfect storm for sealed unit failure to become visible. During the colder winter months, any trapped moisture inside a failed unit can freeze, staying hidden. As temperatures rise in March and April, that moisture warms up and evaporates inside the unit — making the clouding suddenly appear more obvious. Your windows haven’t got worse overnight; spring has just made the existing problem impossible to ignore.
The rapid temperature changes of spring also put extra stress on seals. Glass and the spacer bars around sealed units expand and contract at different rates as temperatures swing between cold nights and sunny afternoons. Over time — particularly in older units — this cycling weakens the seal until it finally gives way.
Do you need to replace the whole window?
Almost certainly not. In the vast majority of cases, the frame, handles, and hinges are perfectly fine — it’s just the glass unit itself that’s failed. We replace just the sealed unit, sliding the new glass into your existing frame. The job usually takes under an hour, there’s no building work involved, and it costs a fraction of a full window replacement.
We carry out misted glass repairs across Warrington, Widnes, Runcorn, St Helens, and the surrounding areas — so whether you’re in Stockton Heath, Appleton, Upton Rocks, or Halton, we’re never far away.
How much does it cost to fix misted double glazing?
Replacement glass starts from £70, which includes supply, fitting, and our 10-year guarantee against the unit misting up again. The exact price depends on the size of the unit and the type of glass — if you have toughened, patterned, or leaded glass, we work with those too. There are no call-out fees, no deposits, and you only pay when the job’s done to your satisfaction.
If you’ve got several windows showing the same problem, we can often do them all in a single visit, which saves time and usually works out better value. Find out more about our replacement glass service here.
What about conservatory glass?
Conservatories are especially prone to springtime condensation issues because of the large glass surface area and the way they heat and cool rapidly. If you’re noticing cloudiness in your conservatory roof panels or side windows as the season changes, the same principle applies — it’s almost certainly a failed sealed unit rather than anything more serious. Our conservatory repair service covers exactly this.
What should you do now?
Take a look at your windows on a sunny morning. If the mist is on the outer surface and clears within an hour or two — you’re fine. If it’s sitting between the panes and is still there in the afternoon, give us a call on 0800 5 118 007 (freephone) or 01925 205580, or message us on WhatsApp and we’ll arrange a free, no-obligation visit to assess the units and give you a straight price.
We’ve fixed misted windows for over 440 customers who’ve left us five-star reviews on Trustpilot, and we turn up when we say we will. Spring is a busy time for this type of repair — so the sooner you get in touch, the sooner we can get it sorted.
Frequently asked questions about springtime condensation
Can condensation between the panes be fixed without replacing the glass?
No — once the seal has failed and moisture is inside the unit, the only proper fix is replacing the sealed unit. There are DIY kits that claim to drill holes and insert desiccant, but these are a temporary cosmetic fix that usually makes the problem worse over time. We always recommend proper unit replacement.
How long does a misted unit replacement take?
Most jobs take between 30 minutes and an hour per unit. We bring everything we need with us, so there’s no waiting around for parts in most cases.
Will my new glass unit mist up again?
We offer a 10-year guarantee on all our replacement glass against seal failure. Modern sealed units, correctly fitted, should last 20–25 years before the seal begins to degrade.
Do you cover my area?
We cover Warrington, Widnes, Runcorn, St Helens, Frodsham, Helsby, Lymm, Knutsford, Newton-le-Willows, and surrounding areas. If you’re not sure, just call us — chances are we’re closer than you think.
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