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Double glazed unit replacement in your existing frames
A misted or broken sealed unit can be changed without touching the frame. We measure it, have a new unit made to size and fit it for you.
- Open 24 hours, every day
- Homes and businesses
- Fully insured
- Photos for your insurer
What double glazed unit replacement is and when you need it
Double glazed unit replacement means swapping the sealed glass unit in a window while the frame stays where it is. The old unit comes out and a new one, made to the same size, goes in its place. Handles, hinges and the frame itself are left alone.
You need it when a unit is cracked, smashed or misted between the panes. Mist inside the unit means the seal has failed, and cleaning will never reach it. Fitting a new unit is the fix.
Sealed units are made to size and cannot be cut on site, so this is a two visit job. On the first visit we measure, and if the glass is broken we cover the gap with window boarding. On the second we fit the new unit. If the break has left your home open, our emergency glazing page explains how urgent calls are handled.
Single panes held in with putty are a different job, covered under broken window repair. For sealed units in front, back and patio doors, see door glass replacement. If you are not sure which kind of glass you have, send us a photo and we will tell you.
What we note before ordering a unit
- Width and height of the glass
- Overall thickness of the sealed unit
- Any pattern or tint that needs matching
- Whether that spot calls for safety glass
Ask for a sealed unit quote
Tell us which windows are misted or broken and we will reply with a price.
Prefer to talk? Call 0808 135 0137.
What double glazed unit replacement includes
Units we replace
- Misted and cloudy units
- Units with water sitting between the panes
- Cracked units
- Units with one or both panes smashed
- Units in uPVC frames
- Units in timber and aluminium frames
- Clear, patterned and obscure glass
- Toughened or laminated units where needed
What the job covers
- Broken units boarded over on the first visit
- Every unit measured before it is ordered
- New sealed unit made to size
- Glazing beads taken off with care
- Old unit lifted out of the frame
- New unit set in and the beads refitted
- Old and broken glass taken away
- Photos and an itemised invoice for insurers
What a replacement double glazed unit costs
We do not work from a fixed price list, because sealed units are made one at a time. Four things shape your quote.
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Size of the unit
A small top opener uses far less glass than a full height picture window. -
Type of glass
Plain clear glass is the simplest. Patterned, toughened and laminated units take more to make. -
How many units
One failed unit, or several around the house that can be measured and fitted together. -
Where the window is
A unit you can reach from the ground is easier to change than one on an upper floor.
Send a photo of the window for a sealed unit quote
How double glazed unit replacement works
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Show us the window
Message a photo of the whole window, a rough size if you have one and your postcode. -
We quote for the unit
You get a price for supplying and fitting the unit before any work is booked. -
We measure and make safe
The unit is measured exactly. If it is broken, the glass is cleared and the gap is boarded. -
We come back and fit
Once the unit has been made, we remove the old one and bead the new one into your frame.
Why use us for sealed units
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Your frames stay put
Only the glass is changed, so there is no need to disturb the plaster or the frame around it. -
Covered while you wait
A broken unit is boarded by the same people who will later fit the new glass. -
Someone always answers
Our phones are staffed 24 hours a day, every day, for homes and for businesses. -
Insured, with a paper trail
We are fully insured, and you get photos and an itemised invoice to pass to your insurer.
Before and after: what our double glazed unit replacement looks like
Why a misted unit cannot be wiped clear
A double glazed unit is two panes sealed together around the edge with a gap between them. When that seal fails, damp air finds its way into the gap and settles on the inner faces of the glass. You see it as mist, droplets or a cloudy film that comes and goes with the weather.
Because the moisture is trapped inside the unit, wiping the room side or the outside makes no difference. Once the seal has gone it keeps letting damp air in, so the lasting answer is a new unit. In most cases the frame is still sound and only the glass needs changing.
Condensation on the room side of the glass is something else and does not mean the unit has failed. If you cannot tell which side the mist is on, send us a photo and we will tell you.
Related glazing and boarding services
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Broken window repair
Cracked and smashed panes taken out and replaced. -
Door glass replacement
Glass panels in front, back and patio doors. -
Emergency glazing
Broken glass measured and replaced by a glazier. -
Toughened and laminated safety glass
The right safety glass for doors and low windows. -
Window boarding
Timber boards fixed over any size of window. -
Shopfront glass replacement
New shopfront glass made to size and fitted.
We also work for landlords and letting agents, facilities managers, schools and pubs and restaurants. Useful guides: can a double glazed unit be replaced without a new frame and toughened or laminated glass: which one you need, or see all guides.
Double glazed unit replacement questions
Can you replace the glass and keep my window frames?
Yes. The sealed unit is a separate part that sits inside the frame, held by glazing beads. We take the beads off, change the unit and put them back, so the frame stays as it is.
Why has my double glazing misted up inside?
The seal around the edge of the unit has failed and damp air has got between the two panes. It cannot be cleaned from either side, which is why the unit is replaced.
Why can the new unit not be fitted on the first visit?
Every sealed unit is made to the exact size of its frame and cannot be trimmed afterwards. We measure first, order the unit and return to fit it when it has been made.
What happens if the unit is smashed and not just misted?
We clear the broken glass and board the window so your property is closed up. The unit is measured during that same visit and fitted when we come back.
Will the new glass match my other windows?
We note the pattern, tint and thickness of the old unit so the new one is as close a match as we can get. A photo of the windows either side helps us check.
How much does a replacement double glazed unit cost?
That depends on the size of the unit, the type of glass, how many you need and how easy the window is to reach. Send a photo and your postcode and we will quote before any work starts.
Need a misted or broken unit replaced
Send a photo of the window and your postcode. We will reply with a price for the new unit.