Why Do Double-Glazed Windows Mist Up Inside?
Noticing mist or fog trapped inside your double-glazed windows can be frustrating. It ruins your view, makes the room feel damp, and often signals that something’s gone wrong. But what causes it—and what should you do about it?
Understanding the Problem: What ‘Misting’ Means
When moisture appears between the two panes of glass, it means the hermetic seal of the double-glazed unit has failed. Once that airtight seal is compromised—whether by age, weather, or poor installation—moist air can get in and condense when temperatures drop.
Common Causes of Seal Failure
- Age and wear – Seals degrade naturally over time, especially after 10–15 years.
- Poor installation – Gaps or misaligned panes leave space for air and water to sneak in.
- Thermal stress – The glass expanding and contracting with temperature changes can weaken the seal over time.
- Water damage or frame breakdown – Water ingress near the edges of the glass can rot or warp timber and affect the bond.
Misted Windows: Cosmetic or Something More?
While misted windows may seem like just a visual annoyance, the implications can go further:
- They reduce the insulation properties of your windows.
- Heat escapes more quickly, increasing your energy bills.
- They often indicate hidden moisture problems that could impact the surrounding frame or wall.
So while it might start as a foggy view, it can become more than a minor inconvenience over time.
Repair vs. Replacement: What’s the Best Fix?
The good news is that in most cases, you don’t need to replace the whole window. If the frame (uPVC, aluminium, or timber) is in good condition, a glass-only replacement is usually sufficient and far more cost-effective.
Here’s how Get My Windows Fixed typically helps:
- Survey the affected unit and check the frame condition.
- Replace the failed double-glazed unit with a new, sealed one that matches the existing window style.
This method is quicker, cleaner, and significantly cheaper than a full window replacement—and it restores both clarity and insulation.
How Much Does It Cost?
Prices vary based on size and glass type, but here’s a rough guide:
- Small window (approx. 600x400mm): from £65–£85
- Medium window (approx. 1000x700mm): from £90–£120
- Larger panes or special glass (e.g., toughened or energy-efficient): slightly more
There’s no need to pay for a full-frame window—and Get My Windows Fixed offers free surveys and fixed quotes with no pressure to commit.
How Long Does It Take to Fix?
Once measured, most units can be replaced in about 30–40 minutes per pane by a professional. From initial booking to completion, turnaround is usually within 7–10 days, depending on glass stock.
Simple Signs to Watch For
Not sure if your double glazing has failed? Check for these common signs:
- Cloudy or foggy glass that doesn’t wipe off
- Water droplets or streaks inside the pane
- Cold patches or draughts near the window, especially in winter
- Excess condensation on the surrounding frame, even with good ventilation
Let’s Make Things Clear Again
If your windows are misted up inside, you don’t have to live with blurred views and poor insulation. Whether it’s one pane or several, Get My Windows Fixed can help you sort it—affordably and efficiently.
Get a free quote today and restore clarity to your home.