Misted unit replacement with laminated glass

What is misted unit replacement with laminated glass?

Misted unit replacement means swapping a double-glazed unit whose seal has failed, so moisture has got between the panes, for a new sealed unit. Doing it with a laminated pane turns a routine repair into a security upgrade for little extra cost.

When the seal around a double-glazed unit breaks down, damp air gets into the gap and condenses on the inside of the glass, where it cannot be wiped away. The unit also loses much of its insulating value. The fix is a new unit, not a new window: the frame stays, the beads come out, the old unit is removed and a new made-to-measure unit goes in.

Because every unit is being made anyway, specifying a laminated inner pane adds security at the same visit. The new unit can also be better than the old one: low-E glass, argon gas and warm-edge spacers improve insulation, and the overall thickness is matched to your frame. If your beads are external, we add security tape while the unit is out so it cannot be lifted out from outside.

How much does misted unit replacement with laminated glass cost?

Our guide range is £150 to £474 including VAT (£125 to £395 plus VAT) per unit, supplied and fitted. The exact figure depends on size, glass makeup, frame condition and access, and your fixed price is confirmed in writing after the free survey. See all glass prices.

Specification and options

New sealed units made to measure
Laminated inner pane for security
Low-E glass, argon fill and warm-edge spacers
Toughened panes where safety glass is required
Obscure and decorative glass matched where possible
Security tape on externally beaded frames
Old units removed and disposed of
Existing frames, handles and locks kept

Where misted unit replacement with laminated glass is used

Windows with condensation between the panes
Units with blown seals in sunny elevations
Door glass that has gone cloudy
Homes where frames are sound but glass is tired
Rented homes with a few failed units

What to decide before you order

Laminated or standard

A laminated inner pane adds security for a small extra cost while the unit is being made.

Energy specification

New low-E and argon units are usually warmer than the ones they replace.

Unit thickness

We match the overall thickness to your frame so the beads fit properly.

Replace the frame instead

If frames are rotten, warped or very old, new windows may be better value. We will tell you honestly.

Rules across the UK

Safety glazing, building regulations, planning and listed building rules differ between England, Wales, Scotland and Northern Ireland. These are the points most relevant to misted unit replacement with laminated glass; local pages show the version for your nation.

England (similar principles apply in Wales, Scotland and NI)

Replacing glass in an existing frame

Replacing only the glass or sealed unit in an existing frame is generally treated as a repair in England rather than notifiable building work. Replacing a whole window or door is notifiable and is normally certified through a competent person scheme or approved by building control. Either way, new glass in a critical location should still be safety glass.

Safety glass in critical locations

In England, section 5 of Approved Document K treats glazing in doors and in side panels within 300 mm of a door edge, from floor level up to 1,500 mm, and any other glazing below 800 mm, as a critical location. Glass there should break safely, be robust, or be guarded. Laminated or toughened glass meeting BS EN 12600 class 3 is the usual answer, rising to class 2 for door and side-panel panes wider than 900 mm.

Security rules for new homes

Approved Document Q has applied to new homes in England since 1 October 2015. Easily accessible doors and windows, meaning any part within 2 m vertically of the ground or another accessible surface, should meet PAS 24 or an equivalent, and glazing in doors and in windows within 400 mm of a door should be laminated to at least BS EN 356 P1A. It does not apply when you change the glass in an existing home, although it is a sensible benchmark.

How it works

Tell us what needs securing

Use the guide price tool or form, or call. Pane sizes and a few photos help us give a guide figure straight away.

Free survey

A surveyor measures each pane, checks the existing glass, frame and beads, and talks through the rating that suits the risk.

Fixed price in writing

You get a written quote listing each pane, the glass type and class, the price and the lead time. Nothing is ordered until you accept.

Made to measure and fitted

Glass is made to order and fitted by glaziers working under our contract with you, then cleaned, checked and explained.

Misted unit replacement with laminated glass: questions

How much does it cost to replace a misted unit with laminated glass?

Most misted units cost from £125 to £395 plus VAT (£150 to £474 inc VAT) each to replace with a laminated security unit, depending on size and glass finish. Your fixed price follows a free survey.

Why is there condensation between my window panes?

The seal around the unit has failed, letting damp air into the gap. The only lasting fix is a new unit.

Can misted glass be repaired instead of replaced?

Some services drill and dry units, but the seal stays broken and insulation is not restored. A new unit is the reliable fix.

Do I need a new window frame?

No, if the frame is sound. We replace only the sealed unit.

Does replacing a unit need building regulations approval?

Replacing glass or a sealed unit in an existing frame is generally treated as a repair rather than new building work, across the UK. Replacing the whole window is different and is controlled.

Will the new unit match the others?

We match the size, spacer colour and glass as closely as we can, including common obscure patterns.

Find misted unit replacement with laminated glass near you

Choose your county or region for local information and the rules that apply where you are.