Misted Double Glazing Repair in South Wales
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Misted or foggy double glazing means the seal between the glass panes has failed, allowing moisture to enter the cavity. This reduces insulation, looks unsightly and can't be cleaned. We replace failed sealed units quickly and affordably — often without changing the frames.
Benefits
- Clear Views Again: Replace misty glass with brand new sealed units for crystal-clear windows.
- Save Money: Replacing sealed units costs a fraction of full window replacement.
- Restore Insulation: A failed seal means lost insulation — new units restore thermal performance.
- Keep Existing Frames: If your frames are sound, we replace just the glass — saving time and money.
- Fast Turnaround: Most sealed unit replacements completed within a day.
- All Window Types: We replace sealed units in casement, sash, bay and door panels.
Our misted double glazing repair range
- Sealed Unit Replacement: New double-glazed units fitted into your existing frames.
- Upgrade to A-Rated Glass: Take the opportunity to upgrade to better-performing glass.
- Full Window Replacement: If frames are also damaged, we can replace the complete window.
Why double glazing mists up
A sealed double glazed unit is two panes of glass with a sealed gap between them. When that seal fails, moisture finds its way into the cavity and condenses on the inside faces of the glass — the misting you cannot wipe away from either side. Once the seal has gone, the unit has also lost the insulating gas and thermal performance it was built with.
Misting tends to show first on the windows that take the most weather or the most sun, because temperature movement stresses the seal over time. One failed unit does not mean the whole house needs new windows: each unit is assessed on its own, and only the failed glass needs replacing.
Replacing the unit, not the window
Misted double glazing repair usually means a double glazing unit replacement: the failed sealed unit is removed from the frame and a new made-to-measure unit is fitted in its place. The existing frame, handles and hinges stay exactly as they are, which keeps the job quick and the disruption small.
The same approach works for broken window glass replacement — a cracked or smashed pane is swapped for a new sealed unit matched to the frame. Where a frame itself is warped or damaged, the survey will say so honestly, and our windows page covers full replacement where that is the better answer. For glass in a conservatory roof or sides, see conservatory glass replacement.
Misted window repair cost
Misted window repair cost depends on the size and number of units, the glass specification — standard, toughened or patterned — and access to the window. Replacing a single unit is a fraction of the cost of a new window, which is why it is worth surveying the failed units before assuming the worst.
Fairway Window Systems Ltd provides a free home survey and a written quote, and we beat any like-for-like quote. New sealed units are covered by our 10-year guarantee. If several units have failed at once, the written quote sets out each one so you can see exactly what is included.
Frequently Asked Questions
Can misted double glazing be repaired?
The misted sealed unit needs replacing — the seal failure can't be repaired. But we can replace just the glass without changing the frame.
How do I know if my sealed units have failed?
If you see condensation, misting or cloudiness between the glass panes that you can't wipe away, the seal has failed.
Can misted double glazing be fixed without new glass?
No. Once the seal has failed and moisture is inside the cavity, the unit itself has to be replaced. The good news is that only the glass unit changes — your frames stay in place.
How long does a sealed unit replacement take?
The unit is made to measure after the survey, then fitting is usually a short visit per window. The survey gives you a clear timescale for your units before you commit.
Do you replace misted units in doors and conservatories?
Yes. Sealed units in door panels, side screens and conservatory frames can all be replaced individually, matched to the existing glass specification.
Will the new unit match my existing windows?
The new unit is made to the same size and glass type as the one it replaces, including patterned or toughened glass where required, so it sits in the frame exactly as the old unit did.
Get a Free Quote — We Beat Any Like-for-Like Quote
Get a free written quote. Free home survey. 10-year guarantee. Call 02920 860894 or request a callback.
Related glazing options
For damaged or differently specified conservatory panels, read about conservatory glass replacement.
For smashed or cracked panes, see emergency glazing.
For physically damaged panes rather than a failed seal, see window glass replacement.