Misted Double Glazing, Fixed at Glass Level
Blown units make a house look tired long before the frames are worn out. Where the frame is sound, only the glass needs to change.
A seal problem, not a window problem
A double glazed unit is two panes bonded to a spacer bar filled with desiccant. When the perimeter seal lets go, damp air gets in, the desiccant saturates and the cavity fogs. Nothing about the frame has failed — which is why replacing whole windows for misting is usually the wrong spend.
We survey the whole elevation rather than the one window you called about, because units installed on the same day tend to fail within the same few years of each other.
How we work through it
1. Confirm it's a blown unit
Moisture you can't wipe away means the glass has failed, not the room. We check that first so you aren't paying to solve a ventilation problem with glass.
2. Measure and check the frame
We measure the sight size, check the drainage slots are clear and inspect the beading and gaskets that hold the unit — they decide whether glass alone is enough.
3. Order the unit to size
Each unit is made to the measured size and specification, including any upgrade to warm-edge spacer or A-rated glass.
4. Swap and re-bead
The failed unit comes out, the rebate is cleaned, the new unit is packed and re-beaded, and the frame drainage is cleared before we leave.
When replacement is the better call
- The frame has distorted and the unit no longer sits square in the rebate
- Drainage slots are blocked beyond clearing and units sit in standing water
- Several units on one elevation have gone within a short period
- The hardware is obsolete and replacement parts are no longer made
If that's your situation, the honest route is window replacement, and we'll quote both so you can compare.
Town-by-town misting guides
- Misted units in Exeter
- Misted units in Plymouth
- Misted units in Newton Abbot
- Misted units in Torquay
- Misted units in Exmouth
- Misted units in Truro
- Misted units in Taunton
- Misted units in Bournemouth
- Misted units in Poole
- Misted units in Topsham
- Misted units in Plympton
- Misted units in Paignton
- Misted units in Tiverton
- Misted units in Honiton
- Misted units in Sidmouth
- Misted units in Barnstaple
- Misted units in Bideford
- Misted units in Ilfracombe
- Misted units in Tavistock
- Misted units in Newquay
- Misted units in St Austell
- Misted units in Falmouth
- Misted units in Penzance
- Misted units in Bodmin
- Misted units in Camborne
- Misted units in Bude
- Misted units in Launceston
- Misted units in Dorchester
- Misted units in Weymouth
- Misted units in Bridport
- Misted units in Sherborne
- Misted units in Blandford Forum
- Misted units in Wimborne
- Misted units in Bridgwater
- Misted units in Yeovil
- Misted units in Wells
- Misted units in Glastonbury
- Misted units in Frome
- Misted units in Minehead
- Misted units in Burnham-on-Sea
- Misted units in Chard
- Misted units in Saltash
Common questions
- Can misted double glazing be fixed without replacing the whole window?
- In most cases yes. Misting sits inside the sealed unit, so where the frame, hinges and locks are sound we swap only the glass and leave the frame in place.
- Why has only one window misted up?
- Sealed units fail individually. South-facing and coastal elevations cycle hot and cold hardest, so those units usually go first even when the rest of the house is fine.
- Should I upgrade the glass while it's out?
- It's the cheapest moment to do it. The labour is already being paid for, so moving to a warm-edge, argon-filled A-rated unit only costs the difference in the glass.
- How long does a sealed unit swap take?
- Once the replacement unit has been made to size, the swap itself is usually a single short visit per window with no internal disruption.
Ready to start your project?
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