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insulation sound proofing draught proofing stop condensation
elegant secondary glazing
ExtraGlaze contact details
Instant quote
Extraglaze Explained
Measuring Guidelines
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order free sample
  • 1 week ago
    ratings 5
    Second time purchasing some Extraglaze panels
    This is the second time we have bought and fitted the Extraglaze system. We were so impressed first time around, which led us to making this second purchase as we cannot fault the system or the customer care shown by the company personnel.
    Tracey Cannon, Bromley, Kent
  • 1 month ago
    ratings 5
    Service rating : Excellent Service , I appreciated the updates on progress from initial purchase to delivery
    Product : A great secondary glazing system , slim fitting and discreet . Easy to remove if required
  • 2 months ago
    ratings 5
    Excellent service
    Richard and the team were extremely helpful, despite being snowed gnat one point. They delivered the order in time for me to fit it for the Christmas visit of my mother and elderly stepfather
    Andrew Eaton
  • 2 months ago
    ratings 5
    Service rating : We placed Extraglaze panels onto two sets of sash windows. Very pleased with the ordering process, support and end results. Couldn't ask for more!
    Product : We placed Extraglaze panels onto two sets of sash windows. Very pleased with the ordering process, support and end...
  • 2 months ago
    ratings 4
    Good service
    Service rating : It was well packaged, the installations instructions were pretty good, it looks fine.
    Extraglaze were very helpful in chasing up a confused delivery service.
    Product : Only time will tell on its quality

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.


Ultra-Slim, almost invisible Secondary Glazing


Transforming the enjoyment of your own home

Extraglaze is a scientifically proven, magnetic secondary glazing, specifically designed for period windows and historic buildings.

arrowpichigh tiny Instant warmth retention

arrowpichigh tiny Your windows will look their best for much longer

arrowpichigh tiny Condensation very often eliminated, immediately

arrowpichigh tiny Clearer than glass

arrowpichigh tiny Sound proofing to reduce road noise significantly

arrowpichigh tiny Readily shaped to out-of-square frames, arches and more

arrowpichigh tiny So slimline and discreet it can even fit behind shutters.

Extraglaze achieves this with the absolute minimum change to the appearance of any windows. Our customers remark that their secondary glazing is almost invisible, once installed.


The benefits continue:

arrowpichigh tiny instantly feel more comfortable
arrowpichigh tiny your windows made better than ever
arrowpichigh tiny no upheaval, building works or decorating
arrowpichigh tiny lower energy bills
arrowpichigh tiny draughts sealed
arrowpichigh tiny no damage to existing windows
arrowpichigh tiny light weight and easy to handle
arrowpichigh tiny Listed Building Consent not required*

Why Choose Extraglaze or Saverglaze
...over other magnetic secondary glazing :

     System features
extraglaze saverglaze
Other Makes
info icon Fully assembled panels: just unpack & fit arrowpichigh tiny arrowsaverglaze question pichigh tiny
info icon Superior packaging = safe delivery every time arrowpichigh tiny arrowsaverglaze cross pichigh tiny
info icon All panels named for identification arrowpichigh tiny arrowsaverglaze cross pichigh tiny
info icon Panel edge colours match your windows arrowpichigh tiny arrowsaverglaze cross pichigh tiny
info icon Scientifically proven in independent tests arrowpichigh tiny arrowsaverglaze cross pichigh tiny
info icon Extra high bond adhesive arrowpichigh tiny cross pichigh tiny cross pichigh tiny
info icon Frame magnets also match your windows arrowpichigh tiny cross pichigh tiny cross pichigh tiny
info icon Maintenance free magnets arrowpichigh tiny cross pichigh tiny cross pichigh tiny
info icon Branded Perspex arrowpichigh tiny cross pichigh tiny cross pichigh tiny
info icon Always finding & offering new solutions arrowpichigh tiny cross pichigh tiny cross pichigh tiny
info icon "Fitted By Us" - the expert option arrowpichigh tiny cross pichigh tiny cross pichigh tiny

...over glass in sliding aluminium frames:

    Benefits to consider... Extraglaze Sliding aluminium
    Condensation Very low ** Serious
    Thermal insulation 11% better U-value than aluminium
    Product thickness 8.2mm Typically 40mm
    Frames None White aluminium
    Change to your window's appearance Almost none A bulky glazed unit
    Sound proofing *** ---- Comparable ----

*We have installed Extraglaze magnetic secondary glazing in all types of listed buildings, in conservation areas and in World Heritage sites. In every case, after discussion with the relevant bodies, no formalities/consent was required. We advise that customers always make appropriate enquiries in case an exception should arise, however usually a phone enquiry is all it takes to get clarification.

**In tests conducted for us at Coventry University, Extraglaze suffered 78% less condensation than the aluminium framed glass secondary glazing, when fitted to a sash window, with high humidity 'indoors' and temperatures of between -5 and -10 centigrade 'outdoors'.

***In tests conducted for us at the Building Research Establishment, we compared Extraglaze against an aluminium system stiffened by sliding framework running down the centre of the window. This stiffness gave it a slight advantage. Whereas the Extraglaze had no stiffeners, and looked much better for it. Had we stiffened it we believe they would have been more comparable.

**** Only genuine Extraglaze panels were used in these tests. No other magnetic systems were proven.

Fitting Service - or DIY

We can expertly install for you or supply fully assembled panels for you to fit with our full guidance. Order your free sample pack here.

Developed for listed buildings & conservation areas

Extraglaze is the ideal secondary glazing solution for Listed Buildings and for those in Conservation Areas, being particularly suitable for buildings of historic significance. Planning Permission or Listed Building Consent will almost certainly not be required from your local authority. "most authorities encourage the fitting of secondary glazing to increase the thermal efficiency of period windows."

Fitted by Us service – for a fuss free installation

We provide a complete Supply and Fit service, from the initial survey right through to fitting and after sales care. You can get an initial estimate online here without the need for our surveyors to call. If you are happy with your estimate you can book a comprehensive survey and follow up quote online too.

Where do we install?

van medWe are working towards installing nationally but at present there is no surplus charge within a 50 mile radius of our Shrewsbury base or one of our national installers. If you are beyond that distance, we will ask a fair and reasonable charge for travel time and fuel.

Please send us your own measurements in the first instance to obtain an initial estimate. If you feel totally confident in measuring and installing for yourself then please use our Estimate or Buy Online pages to place your order.

DIY - fully assembled for you to install

We supply DIY secondary glazing panels ready to install. These are not kits, they are made to measure, fully assembled and ready to apply. In many cases all you need to do is open the box and fit the panels to your windows. We will supply a comprehensive set of fitting instructions and are available to offer help via our helpline phone number or via Skype or Facetime. Download our measuring guide here and then enter your measurements into our online estimator where you can also place an order.

To make an enquiry please use the Contact Us page
or email us - This email address is being protected from spambots. You need JavaScript enabled to view it.




Extraglaze is both a supplier and installer of specialist secondary glazing services, with a rapidly expanding network of trained fitters. Our customers include home owners, offices, schools, even holiday resorts with single glazed windows. We frequently install our secondary glazing in listed buildings and conservation areas, as well as church conversions, often with arched and stone framed windows. Extraglaze will even turn double glazing into triple glazing, and stop condensation. If you live in a noisy city or town centre, especially with draughty, badly sealed sash windows, it will bring you the sound insulation you never imagined possible, even as you watch the traffic pass by! We insulate sash windows and insulate casement windows. All our panels are made to measure. We make special shapes, arches and out-of-square panels, even bowed (3 dimensional) panels for windows that follow curved facades. We supply and fit magnetic secondary glazing for sash windows and casement windows, and of course stained glass windows. If you require energy saving windows then insulating sash windows is a great alternative to window replacement or window renovation. The low cost of secondary double glazing is affordable compared to replacement sash windows & replacement casement windows. Extraglaze offers window thermal insulation and sound insulation for existing windows including stained glass windows. Both double glazed sash windows and triple glazed sash windows are possible. Extraglaze can turn draughty old windows into energy efficient windows.



Help & Guides

measuring icon


How to stop condensation


For sash windows
sash up
For casement windows
casement up
Easy Open System
easyopen up