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20 Up-And-Comers To Watch In The Secondary Glazing Sash Windows Industry
Secondary Glazing For Sash Windows

Many homeowners are unable build new double-glazed windows to their homes due to financial limitations or because they live in listed buildings that prohibit any modifications to the exterior.

Secondary glazing for windows with sash is a great alternative that can be put in in various ways.

It's an additional glass pane inside the window frame, which blocks cold air from getting into your home, as well as providing insulation and noise reduction.

Fixed Inserts

If you're thinking of secondary glazing for your sash windows there are a variety of styles to choose from. Each style has each of its own benefits that range from increased security to less condensation. Which is the most effective choice for you?

The basic premise of secondary glazing is the installation of an additional glass inside your existing window frame. This adds an additional layer of soundproofing and insulation which can greatly increase the efficiency of your home's energy use.

However it's not always feasible to install new double-glazed windows to your home, especially if you live in a listed building or are subject to strict planning regulations that dictate what can and can't be done to your exterior.

Secondary glazing is an excellent alternative in these situations. It can be put in quite easily. It's also a popular choice for those who want to modernize their old home without the need to tear down the original sash windows and replace them with contemporary ones.

There are a number of different options for secondary glazing sash windows, all of can be customized to fit your frame. Proprietary systems are generally comprised of painted aluminum frames that fit into the existing depth of the staff bead on a sash window. This allows shutters and sills to be retained.

They can be fitted using a variety of installation methods, including glazing clips and Velcro. These offer a more aesthetic alternative to screw-fixed units and are ideally suited to windows that don't need to be opened often. You can also select a fixed lift-out device that can be easily lifted out and reinstalled to open your windows.

Horizontal Sliders

Horizontal sliders are the most popular method of enhancing the appearance of a sash window. They are also very discreet and ideal for historic structures, conservation areas and listed properties. They can be installed in most cases without the need for access from outside as they are operated from inside.

They are simple to operate using a hand, and can be opened wide or left partially open to allow for ventilation. They are effective in stopping draughts and also filter harmful UV light. They can be used in conjunction with a flyscreen to ward off mosquitoes and other insects during summer months.

Trackglaze horizontal sliding systems give all the advantages of double glazing for your original sash window. It consists of PVC double sliding track that runs across all four sides of the cavity and a simple brush seal around each glass sheet and finger pull angle handle to function as a hand and decrease bowing. It comes in kits with 1m or 2m of track and angle that can be put together to create bigger spans.

The acoustic advantages of secondary glazing are important and can improve noise reduction from outside, particularly the airport, rail and road traffic. The addition of toughened or laminated glass can further improve acoustic performance. Standard secondary glazing reduces outside noise to 52dB (Rw) and special glass, like Stadip Silence Laminated Acoustic Glass, can achieve even more impressive levels of acoustic performance.

It can increase the energy efficiency of your home by keeping it warmer for longer, and reducing dependence on central heating. It's much less expensive than replacing your original sash windows, and can be installed almost everywhere without the need to remove the existing window or door frame.

Vertical Sliders

Secondary glazing is an affordable option that is typically more manageable than a complete window replacement. It's suitable for Listed Buildings & Conservation Areas. It's a great option for upgrading traditional sash windows in Suffolk & Essex with modern insulation benefits while keeping the character of older homes.

Vertical Sliders are specially designed for sash windows, where regular hinged panels don't work. The system is comprised of two secondary sashes that are secured one above the other within an outer frame. They are supported by spring balances that allow for effortless movement. The system can be placed on the inside of an existing window to ensure better thermal performance, or it can be fitted with a space between the frame and the glass to maximize acoustic properties.


You can choose from a variety of stop-strips and handles that suit your preferences. They can be put in the closed position to provide additional security or propped open to allow ventilation on the top or bottom glass. They can be fitted with an insulation bristle to stop drafts.

The 'Choices' vertical slider secondary glass features all the authentic wood detailing you'd expect in a period window. It is available in a variety of colors that will match your existing sash. It is almost impossible to distinguish from the original sash windows, as details such as sash horns as well as traditional butt joints are included in the design. It's available in a wide variety of sizes and can accept glass up to 6.8mm to add insulation to prevent loss of heat. The tilt-in option allows the individual sashes of the window to be hinged upwards on safety stays for easier cleaning.

Hinged Casement

Our single-pane secondary glass can be installed on sash windows of any style, including traditional box sash and casement. Our hinged units are manufactured with a secure multi-point locking system and can be supplied with keys lock handles. This ensures that the glazed panel is locked securely in place and is pulled tightly against the frame, creating a seal to minimise heat loss. Hinged windows are available either top or side hung and can also be constructed as double-glazed. Double-glazed windows are a great way to improve sound insulation and are available in 43dB, 47dB or 51dB.

Casement windows are able open up and let in breezes at different angles. This is in contrast to a the horizontal sash window, with movable sashes in the frame that move horizontally. They can also be opened from the top and bottom for controlled airflow. This is why they can increase airflow and provide an effective alternative to traditional windows made of sash.

They are used in modern homes due to their slim "sightlines" which allow for unobstructed view, but they can also be put in listed homes since they do not require transoms or mullions. They can also be utilized in areas that are difficult to access since they are easily opened by turning a handle.

The primary drawback to this kind of window is that it can block off large openings and may restrict the use of certain window treatments. They can also be difficult to clean since they open outwards, and could require regular maintenance and servicing.

Lift Out Windows

Secondary glazing can be set up in a variety of ways and the price will vary according to the thickness, type and materials you select for your frame and panes. uPVC frames are the least expensive, followed by aluminium and wooden frames. Specialised glass, as well any extra features such as security or sound reduction may also increase prices.

The complexity of the installation will also affect the cost. The more complicated the project will take longer and more labor will be required. This is also true for heritage properties with more intricate sash window designs.

Analyzing the condition of existing windows is a good way to begin. Repair My Windows And Doors conducted by a skilled professional will give you a precise idea of what the costs might be.

In general secondary glazing has a minimal effect on the appearance of your home. Modern FINEO double-glazing has slim and distinct frame lines. This allows you to improve thermal efficiency without sacrificing aesthetics.

The horizontal sliding secondary glazing option is popular because it allows easy access to the existing sash window for cleaning or ventilation. They also come with a tilt feature, which is activated by unlocking the catch and raising your secondary glazing panel vertically up to a certain level. This is great for windows that aren't opened frequently and can be used to make it easier to access air conditioning in bay windows. You can even use them to open the middle sash of a traditional sash bay window to give a more symmetrical appearance.

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