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Sash windows double glazing

Sash windows double, how double glazing retrofitting can benefit your home and improve your family comfort.

Can Existing Sash Windows Be Double Glazed?

Absolutely! With the right expertise and advanced glazing products, even Graded/Listed properties can be upgraded to double-glazing.

In most cases, original wooden sash windows still have single-pane glazing installed. Our professional team removes existing glazing and, with a few skilful adjustments, install double-pane glazing units.

Where double-glazing units have been fitted already, we can remove and upgrade these. Older double-glazing units fail with age, lose their thermal properties and often detract from the period charm visually.

We use premium-grade double-glazing which is ultra-thin yet high performance. The lead-free, vacuum-sealed units offer exceptional thermal, acoustic and environmental properties. Our installation methods ensure that important original characteristics are retained, living conditions are enhanced and the extended service life is guaranteed.

All windows requiring double-glazing upgrades are carefully measured: we provide custom glazing units of all shapes and sizes – square, oval.

Retrofit into existing sahes

Retrofit into existing windows/sashes:

1. Remove existing single glazing


2. Retrofit new vacuum glazing into existing sashes


3. Change cords and re-balance weights of existing sashes


4. Draft proof the existing sashes

Sash Windows Double glazing
Sash Windows Double glazing
Sash Windows Double glazing

How long does it take to install new double-glazing into existing windows?

We provide bespoke solutions to each restoration project to ensure best-fit results. For every project, we work efficiently, professionally and with uncompromising attention to detail.


To give you an example of the timescales we operate to:

Example project: A typical Victorian property with 10 sash windows, requiring frame restorations, draught-proofing, double-glazing installations and finishing decorations will take 10 to 14 days. If only double-glazing installations are required, the project at the same property would take 5 to 7 days.



It is worthwhile to consider the best time of year for planning double-glazing installations. For your convenience, we usually schedule reglazing work for the warmer months, between March and October. However, we work throughout the year in all months – should you require our professional double glazing retrofitting services to make your home warm, secure and liveable, contact us to arrange an assessment.

Can any wooden sash windows be double glazed?

The most likely answer is yes!

There are a wide range of challenges involved in re-glazing traditional wooden windows which depend on the window’s design and condition. Owing to our expertise, we have never been beaten by a restoration challenge!

Common problems

We encounter and solve when installing double glazing include weak frames which are not designed to take the extra weight. To solve this, we enhance existing frames with hidden metal frameworks and reinforced joints – cleverly installed to safely cope with the additional weight. In sash windows, all necessary counterbalance systems and mechanisms are adjusted and upgraded too.

Other restoration companies can find that the narrow rebates of original wooden windows make it impossible to install double-glazing without altering the authentic appearance. Because we use advanced, ultra-slim double-glazing units, we can comfortably work with original windows, without having to make drastic rebate alterations. At 6.7mm thick, the glazing we use is only 3mm thicker than an average single pane, yet is vacuum-sealed to provide the thermal properties of triple-glazing!


Reinforcing sashes to hold heavier glazing

In older windows, we reinforce wooden frames from within with metal structures. This helps old sashes to hold more weight of the new glass.

Can windows in listed buildings be double glazed?

In most cases, yes!

Because of the progress in technology and manufacturing processes, we can create glazing units that were simply not possible back when your timber windows were originally designed and crafted.

The double-glazing units which we install are ultra-tough yet incredibly thin compared to average double- or triple-glazing. And because they are vacuum-sealed, they offer many advantages and improved performance.

What do revolutionary glazing products mean for your listed property? The thin profile allows us to professionally fit upgraded glazing without compromising on authenticity. The appearance and original design of your windows are not lost – typically, the rebate depth comfortably takes the new panes with only slight modifications needed.

Although the correct permission will be required from your local regulatory authority

listed buildings double glazing

What are the different types of double glazing glass?

We are able to provide a wide variety of glazing options to suit all different needs and window styles. All are expertly selected and installed to provide the maximum benefits and comfort. these are some examples of the double-glazing which we work with to replace your old glazing:

  1. Low E-energy Saving Glass
  2. Toughened Safety Glass
  3. Laminated Safety Glass

Double-glazed window sashes and ensuring smooth operation

When you upgrade to double-glazing, you add multiple benefits including acoustic improvements, excellent thermal efficiency, reduced energy bills and advantages for the environment.

In most cases, additional glazing panes also means the addition of weight. Thankfully, this does not impact on the smooth operation, strength or safety of your windows. With our skilled methods and experience, we make a number of corrections and structural adjustments to leave your sashes running even smoother, stronger and safer than before.

We replace and upgrade sash cords and re-balance your sash windows using additional weights. All pulleys and mechanics are checked and any structural reinforcements are made to ensure that your windows are a joy to use.

Advantages of Double Glazed Windows

When compared with single-glazed windows, double-glazing provides fantastic upgrades and advantages.

From reduced energy bills to quieter and cosier inside spaces, double-glazing can make dramatic changes to your home which can be enjoyed for decades. The superior thermal properties of double-glazing provide a better barrier between internal and external environments and things like condensation build-up is reduced, alongside reductions in subsequent dampness and moulds.

For example, the ultra-slim double-glazing from Fineo reduces perceived noise by over one third when compared with other glazing of similar thickness. And with extra strength comes extra security – especially when toughened security glass is installed.

The market value of your property will also increase when double-glazing upgrades are made using professional restorers. Whether you’re looking to sell your property now or might be planning it for the future, double-glazing can deliver great returns on your investment

Sash windows double glazing

Repairing sash windows prior to double glazing

To properly prepare your existing windows for safely accommodating the additional weight of your glazing upgrade, we provide all the services you need, including sash windows repair.

For a lot of historic windows which still have single-pane glazing, repair works are commonly needed. Over time, original timbers succumb to the elements and need professional restorations to return them to full health. All rotten timbers to frames and any structural damages are thoroughly repaired, ready for the secure installation of new glazing.

Weak frames and original joinery can be reinforced by our team without compromising on appearance. All windows are carefully assessed to ensure the best fit and smooth, safe functioning.

It is common practice for us to install draught-proof systems alongside fitting double-glazing. This further enhances the thermal, acoustic, and functional benefits.

Combining services such as double-glazing, woodwork repairs, decorations and draught-proofing as part of the same project is a great way to really optimise your living conditions, property value and all-round quality. These services all go hand-in-hand and provide an effective, efficient way to complete comprehensive restoration work.


Sash Windows Double glazing
Sash windows double glazing

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