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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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  • 1 week ago
    ratings 5
    Canal boat condensation
    Service rating : I live on a canal boat and condensation is a problem. I have 13 windows now fitted and absolutely delighted.

    No condensation and warmer air. The sealing tape is excellent.

    Can't wait for winter.

    I wholeheartedly recommend Extraglaze.
    Product : I live on a...
    Steve Brown, Hemel Hempstead
  • 1 week ago
    ratings 5
    Extraglaze is a superior first class product.
    Service rating : I ordered Extraglaze for one large bay window which has four stained glass panels at the top. Nic from Extraglaze came to measure up and gave advice and detailed information on the whole process. He returned to fit the eight panels in all on two more occasions and throughout the...
    Angela Jones, Coventry
  • 1 month ago
    ratings 5
    Excellent product and service.
    Service rating : The service was excellent. Very helpful staff who gave you useful advice. Panels fitted perfectly and matched surrounding woodwork in honey oak. The magnetic strips and panels are hardly noticeable. I'm very pleased with the secondary glazing eliminating draught and condensation and have...
    Beryl Watkins
  • 2 months ago
    ratings 4
    Service rating : Good web site, the product was well explained. They recommended an expensive but very good fitter and the panels were delivered on time.
    Product : So far, it was only fitted yesterday, the product is exactly as explained. It has cut noise from the road, it is relatively subtle - much...
  • 3 months ago
    ratings 5
    Care taken.
    Service rating : Prompt service, no quibble and product shipped in well constructed packaging. Obvious that care had been taken
    Product : Just what I wanted. I am converting a summer house into an art room. Thinking about the cold in winter I was pleased to find easily fitted secondary glazing at a...
    Judith F Hubbard

Extreme Adhesive Test



We wanted to prove our adhesive is 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


Extraglaze is the only scientifically proven lightweight acrylic & magnetic secondary glazing system, specifically developed for historic single glazed windows, to soundproof, thermally insulate and beat condensation effectively.

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


The Benefits:

arrowpichigh tiny Reduce heat loss by up to 60%
arrowpichigh tiny Greatly reduce outside noise
arrowpichigh tiny Lower energy bills
arrowpichigh tiny Beat draughts & condensation
arrowpichigh tiny Minimal visual impact
arrowpichigh tiny Light weight and easy to handle
arrowpichigh tiny No damage to existing windows
arrowpichigh tiny Made to exactly fit your existing windows
arrowpichigh tiny Conservation consent not required*

Why Choose Extraglaze or Saverglaze
...over other magnetic solutions:

     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 labelled 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 Continually being developed and improved arrowpichigh tiny cross pichigh tiny cross pichigh tiny
info icon Fitted by us 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 ----

**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 and are 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."

*To check with your local planning department, click here and enter your postcode.

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. Extraglaze will even turn double glazing into triple glazing, and stop condensation. And if you live in a noisy city or town centre, 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. We supply and fit magnetic secondary glazing for sash windows and casement windows, even 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