Secondary Glazing Sash Windows

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Experts in Sash Windows Repair & Restoration, Timber Windows & Timber Doors in east midlands

Secondary glazing sash windows are a type of window upgrade that involves adding a second layer of glass to the existing windows. This process enhances the windows’ insulation and soundproofing while preserving the sash windows’ original character and style. Secondary glazing can be particularly useful for older buildings where the original windows may not meet current insulation standards or for homeowners who want to improve the energy efficiency of their homes while preserving the architectural integrity of their sash windows.

What is Secondary double Glazing for Sash Windows?

Secondary double glazing involves adding a second layer of glass to an existing single-glazed sash window. This additional pane of glass is usually fixed in place with a frame or track system and creates an extra layer of insulation. It also allows for improved soundproofing and condensation control and makes the window more energy efficient.

Just like double glazing, a gap is left between the two panes of glass, which is usually filled with an inert gas (usually argon) to reduce heat conduction and create even better insulation. Depending on the size and construction of your windows, this might involve replacing the existing sash cords, weights, and pulleys with a more modern, low-maintenance system.

Sash window secondary glazing is a straightforward process that doesn’t require major changes to the existing window. With a professional installation, you’ll enjoy all of the benefits of improved insulation.

Secondary double glazing can be installed in the original sash window without damaging its décor. To do this, it’s best to use a system that can be fitted from the home’s interior. This generally means an acrylic or aluminium frame is used to house the secondary glazing, which is then installed using a track system that fits over existing sash cords and pulleys.

The Benefits of Secondary Glazing

Keeping the house warm: Secondary glazing helps keep the heat inside the house, thus reducing energy bills and keeping you warm in colder months. That’s something that a single-paned window wouldn’t be able to do.

  • Reducing noise: The extra layer of glass makes it harder for outside noise to get in, so if you live in a noisy area or have neighbours who tend to party late, this is the perfect solution for you.
  • Improving security: With an extra layer of glass and a track system, it’ll be more challenging for burglars to get in. You will notice the sturdiness of the double-glazed window. Note that this may not be enough to fully secure your home, so you should also look into installing an alarm system as well.
  • Preserving historic windows: If you live in a house with old, wooden sash windows, you don’t have to replace them with modern, double-paned windows. You can install secondary glazing for existing sash windows and maintain the house’s original look while upgrading its insulation and soundproofing.
  • Improving the aesthetic appeal: If you install secondary glazing the right way, it can enhance the look of your house. It helps to reduce draughts and condensation, making for a much more comfortable home.
  • Financial and environmental impact: The insulation provided by secondary glazing helps reduce the energy you need to heat your home. This means you’re likely to save money and reduce your carbon footprint.
  • A variety of styles: There are lots of different styles, materials, and finishes available for secondary glazing. This means you can find the perfect solution for your windows that fits in with the existing style of your home.
  • Secondary glazing is affordable: As opposed to replacing the entire window, secondary glazing is a much more affordable way to make sure your windows remain energy efficient. Plus, it’s a much quicker process than replacing the entire window.

Different Types of Secondary Glazing and How They Differ?

There are different types of secondary glazing that you can choose from depending on what type of windows you have and how much insulation you need. They include the following;

Fixed Secondary Glazing Inserts

Fixed inserts are an easy and cost-effective way to add a layer of insulation to your windows. This type is usually used for metal frames or when replacing existing glazing. They are usually made of acrylic or aluminium and are fitted with a track system to ensure they fit snugly into the window frame. They can be fitted permanently or semi-permanently. The good thing is that they are easy to clean and maintain.

Horizontal Sliders

The Horizontal Sliders are also known as the hung slider secondary glazing systems. This type of window is ideal for sash windows, and it’s very similar to fixed secondary glazing but with a sliding option. The windows open and close using an overhead track system, and the panels slide on top of each other to provide the necessary insulation.

Vertical Sliding Secondary Glazing for Sash Window

The Vertical Sliders are also known as the hung slider secondary glazing system. This type of window is ideal for traditional sash windows, and it’s very similar to fixed secondary glazing but with a vertical sliding option. The windows open and close using a track system that is fitted on each side of the window frame, and the panels slide up and down to provide the necessary insulation.

Lift Out Windows

The Lift Windows are an affordable and attractive way to add extra insulation to your windows without compromising the look of your window. This type is ideal for wooden frames, and they are easy to install and provide an attractive finish. The panels are held in place with a frame that can be lifted in or out for easy cleaning and maintenance.

Hinged Casement Secondary Glazing

This is another popular choice for those who want to add insulation without compromising the look of their windows. This type is ideal for wooden frames, and it’s easy to install and provides a neat finish. The panels are hinged to the window frame and open outwards for easy cleaning and maintenance.

Bespoke Units

Bespoke units are the perfect choice for those who want a unique and personalized look. This type of secondary glazing is made to measure to fit perfectly into your window frames. The panels are usually made of acrylic or aluminium and offer superior insulation compared to other types of secondary glazing.


Will secondary glazing reduce outside noise levels?

Having been tested independently tested, secondary glazing can reduce noise levels by up to 65%. This means that it is an excellent option for those living in busy urban areas or near airports and other noisier areas.

Do you offer an installation guarantee?

Yes, we do; we have built a strong portfolio and have been in the business for over five years.

What is the average cost of renovating a window with secondary glazing?

The cost depends on several factors, including the size and type of frame, the material you choose, and the complexity of installation. For more information, you can call our direct line and make more inquiries.

How long does it take to install sash window secondary glazing?

The amount of time it takes to install secondary glazing will vary depending on the size of the window and the complexity of installation. Our average timescale targets vary from installation to installation, just call us and fill in the free no obligation form we will come to you for a free assessment.


My technician Andrew replaced all my sash windows that had rotten sills. Accessing the rotten sills was not an easy task. He explained to me what needed to be done in order to fix the problem. He is a great person and I’m happy that he was the one who did the job. He is reliable, tidy, friendly and very professional. I highly recommend him.



I hired Andrew and Alex a while back to repair my damaged sash windows. They were was very considerate and very patient as he did his job. A few days ago, I had another problem with one of my sash lock keys and I called him again to come and fix the problem. I’m very impressed that Liam responded quickly and he not only fixed the problem but he also gave me a spare key. What a great after sales service!

Alan W.


I’m very impressed with the new windows that Andrew installed and also the reconditioning job that he did on other sash windows. The quality of his work is by far more superior than what we got when we hired another company a few years back. We will certainly hire him again if any window work arises

Kelly (Sleaford)


Our decorator referred us to Andrew because some of the work needed a window expert. Andrew together with our decorator did a fantastic job. The work was done efficiently and to the highest standards. Andrew is understanding, committed and very professional. I recommend him without any hesitation.

Steaven Reader


Alex did a great job in fixing windows in our terraced house. The windows were broken, frames damaged and the wood was also rotten. Alex's job was high quality and he did it pretty fast. I was also very impressed that he was considerate of my son’s asthma condition and maintained cleanliness. Top work.



Andrew just recently replaced three sash windows in my Edwardian house. He also repaired and replaced some sills and draught proofed three windows. In addition to that, he also did some carpentry work. What I like the most about Liam is that he did a clean job. He is very professional and always updated me about the timescales and costs. He also did his job with minimal disruptions. I highly recommend him.

Cris M.