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insulation sound proofing draught proofing stop condensation
ExtraGlaze contact details
Instant quote
Extraglaze Explained
Measuring Guidelines
Solutions for listed buildings
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  • 2 weeks ago
    ratings 5
    Brilliant solution for beautiful, but cold, sash windows.
    Excellent, from the time they sent the sample product and the informative booklet. Ordering was simple and when I queried the delivery date they responded with a personal phone call.
    The secondary glazing arrived as ordered, fits perfectly and we are now so much warmer in our...
    Mrs Carole Proud
  • 1 month ago
    ratings 5
    Great product, great service.
    It took us a while to decide to invest in secondary glazing from Extraglaze but we are glad we did!
    From the measuring and fitting instructions to checking details and requirements for accessories and arranging delivery to suit, the service was first class.
    Product : We tried...
    Thank you so much for your praise. We enjoy what we do here - and all the more when we read such great reviews like your own. We hope many others are encouraged to try Extraglaze as a result.
  • 4 months ago
    ratings 4
    Seems a good product and blends in very well with our decor.
    I had internet quote which was straightforward with good tips and advise on the measuring. Felt confident when I sent it that it would be ok.
    I sent for quote as diy and fitted by extra glaze and my only thought was that their quote for fitting sounded quite high.
    Thank you Lee for the positive feedback. It is true that the labour cost of our Fitted by Us service can be quite high. This is dependent largely on the distance from our nearest fitter and whether the work can be done in one or a series of days that might include overnight stays, etc. Just like we...
    lee rogers, Stoke-on-Trent
  • 5 months ago
    ratings 5
    Narrowboat Aslan
    Ease of ordering, telephone assistance where required and prompt delivery
    Product : Very easy to order, very easy to install that gives a professional look whilst using just DIY skills
  • 5 months ago
    ratings 5
    Excellent, friendly and professional!
    Excellent, professional and responsive. Very happy with the work done!
    Product : Fantastic professional service! I recommend them to everyone!

Extreme Adhesive Test



We wanted to prove to ourselves our adhesive is as good as if not the best!

Proven to improve


coventry university logo bre logo


The Building Research Establishment and Coventry University complete tests of the Extraglaze system
Soundproofing and thermal test results...


Recommended for Listed Buildings


Telford and Wrekin Conservation Department encourage the use of secondary glazing, where possible, to increase thermal efficiency.


Care and Maintenance of Extraglaze



Care of your Extraglaze Panels

With a little care and attention your Extraglaze panels will last many years to come. By following these simple guidelines they will continue to look their best, keep your home more comfortable every winter and prove their worth further even as they preserve your windows


Avoid fusion – Our standard foundation magnets are laminated (usually white) and not prone to this problem. If your installation includes the very dark brown unlaminated magnets then the magnet surfaces will benefit from being separated from time to time, to prevent them fusing together. We recommend you simply lift off and refit each panel at least once a year.


Avoid overheating – Extraglaze is not affected by the sun's rays to any significant extent. However, while the sun's rays pass through harmlessly, on the sunniest days the air in the cavity will get hot and this will in turn heat the panel, causing it to expand. In mid-summer this may be a problem for big panels, and especially those on South facing windows. Please act and apply common sense to reduce this risk. If you close curtains the windows, and therefore the panels, will get even warmer. We recommend you be aware of this, and do not hesitate to remove the panels during extended hot periods.


Refit correctly – If you remove a panel please make sure it goes back in the exact same location. If Extraglaze stickers have been applied then refit your panel so that this sticker is upright (this is a good reason to never remove the stickers). If in doubt, please check as follows: the butt joints on the panel (where the magnets meet in the corners at right angles) should meet identical butt joints on the window frame (no lengths of magnetic strip should straddle a butt joint). If the magnets seem to have stopped being magnetic this is because the panel is not lined up correctly with the magnets - please take a look close up!


Some cleaning rules – the panel material is likely to scratch if wiped or cleaned with anything other than clean pure cotton or a “micro fibre” cloth. Please always test any cloth in an inconspicuous corner. You can buy micro fibre cloths at any supermarket , or buy our own approved cloths and a formulated-for-purpose cleaner from the Extraglaze web site, or contact your fitter. Never use paper tissue on your Extraglaze. Paper products nearly always contain minerals, which give the paper surface some hardness. These minerals are extremely abrasive, although microscopic.


Condensation in the cavity – this can happen, especially if the panels are fitted on a cold day: while the panels are being installed the cold glass in your existing window will catch the installer's breath and this will be trapped in the cavity behind the Extraglaze. If this happens please simply take the panel off on a warm, dry day and waft the window so that the moist air is replaced! Condensation is also likely where windows are not maintained externally and insufficiently protected from the elements. The window frame should be inspected for dampness or water ingress (i.e. coming in from outside). Sometimes the cause is an overflowing gutter. If any of the wood that makes up the window frame is wet then this will sweat dampness into the cavity on a warm day, and this will condense on the outside glass when it cools again. Please also check the panel is always located correctly on the foundation magnets. For more information about condensation please see our article How to Stop Condensation.


Help & Guides

measuring icon


How to stop condensation


A typical installation
For sash windows
For casement windows
Easy Open System