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Secondary glazing provides the heat retention, security, and quietness of double glazing without removing existing windows. A DIY secondary glazing kit will reduce outdoor sound transmission and keep your home warmer by reducing heat loss from draughts and heat transfer through window pane glass. 

The kits below are simple to install, more affordable than replacing windows and will give years of trouble-free service. Be sure to check out our installation videos too!

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Secondary Glazing Overview

Secondary glazing is the most cost-effective alternative to replacing your existing windows and much more energy-efficient too. Sheet Plastics will cut your sheets to any size or shape you require, so please get in touch for advice on fitting or measuring.

Our acrylic glazing sheets work hard to mimic glass to give you the same look and feel of a normal window. That’s why we’ve worked even harder to ensure it’s discrete and malleable in case you need to resize or remove it. But if you’re purchasing an alternative to a window, we want to provide you with added benefits normal double glazing cannot.

Why not benefit from our winter offer - get 5% off on all online orders over £50 using the code: WINTER5 (T&C's apply).

The acrylic glazing sheets effectively work as a second insulating layer over the side of your existing windows, making it perfect for listed buildings. It is a more affordable alternative than replacing your windows, and will give you years of trouble-free service. It will even create the same effect as a purpose-built double glazed window.

1. What are the key benefits?

 - Cost-Effective & Energy-Efficient 

Keeping your property warm is a huge part of staying happy and healthy. However, small gaps in your windows can cause the cold to seep in and the heat to leave. Thankfully, acrylic glazing sheets are the perfect solution to covering these gaps and helping you save money on energy bills by maintaining a warm temperature. 

 - Thermal Insulation

Even standard double or triple glazing can show the adverse effects of condensation, such as mould and potential allergic reactions. However, our acrylic secondary glazing removes unwanted moisture, keeping your windows clear and room warm by retaining the heat.

 - Soundproofing

If you require noise reduction or increased privacy, acrylic plastic sheets are an ideal solution. They effectively minimise sound transmission from external sources, ensuring quieter environments for work meetings or peaceful reading sessions at home.

 - Added Security

With the additiona plastic sheet layer, your glass area will be even harder to crack or smash, providing extra protection for your business or home. Also, with the glass covered, you will see a reduction in marks and scratches that are otherwise difficult to remove.

 - Discrete & Versatile

The glazing material is transparent, which makes it completely discrete and versatile for a range of applications. Plastics sheets are used on doors, partitions, and multiple types of windows without compromising on natural light or optimal temperatures.


 - DIY Installation & Easily Removable

The problems with replacing your actual window are that it’s costly and often requires a professional installer. However, secondary glazing provides you with a quick DIY renovation with simple steps, and is extremely easy to replace and remove.

 - Low Maintenance

There’s no need to clean your glass window with because there won’t be a build-up of condensation. Simply wipe down your sheet with a microfibre cloth and soapy water if it does get dirty.

 - Listed Buildings

If you own a listed building, you know the struggle of requiring planning permission for every little project. But potentially not being able to renovate your windows could leave you in ill health, which is why acrylic secondary glazing doesn’t require consent to install.

 - Durable

Our acrylic plastic sheets are long-lasting and will not break under pressure, unlike regular glazing. This is becasue the material possess high levels of strength and resilience. This inherent toughness enables them to withstand external pressures and impacts, ensuring long-lasting durability.

 - Weather Resistant

We’ve all been concerned by bad weather conditions, like a potential tree branch hitting the window or heavy, pelting rain causing the glass to fog on both sides. That’s why our plastic sheets reduce condensation, damage, and other effects of bad weather.

2. Install Video Guides


MagnetGlaze Pro




3. What sizes are available?

The thickness options we supply are 2mm, 3mm or 4mm. Once we have these, select the polish, curve, holes, screws, adhesives, and cleaning supplies.

Acrylic sheets maximum size are 3040x2040mm, whereas secondary glazing is 1500x1500mm. If you’re unsure about the quality, you can order a 150x150mm sample.

4. What materials are used?

We only use clear acrylic sheets as they mimic glass the best while introducing new benefits and features.

This material is cost-effective, easy to maintain, stronger than glass, and lightweight. It also includes protective film layers on both sides. It won’t discolour from UV rays, and it offers thermal insulation and can resist chemicals.


5. Quick Installation Steps

Depending on the options you chose, you may need a screwdriver or drill. We can supply the drill holes and screws for you. If you don’t need these, you will need just the material, adhesive, and cleaning supplies. If you miscalculated the size, shave them down using a saw or utility knife, but you may need to polish the corners.

Quick installation steps:


  1. Clean the frame (this is not your sheet, but the area you’re placing it onto)
  2. Measure the frame
  3. Cut the adhesive to these measurements
  4. Apply adhesive to the frame
  5. Peel off the first protective film from the sheet
  6. Apply the adhesive to the sheet
  7. Apply the sheet to the frame
  8. Peel off the second protective film

6. How easy is it to maintain?

Maintenance is fairly easy. Regularly clean the sheet to remove dust, dirt, and grime with a soft cloth or sponge. Avoid materials that could scratch the surface.

Ensure you check for gaps, leakages, and condensation. This may be a sign it’s coming loose or wasn’t installed correctly. If they are too small or broken, it is cheaper to replace them than try to fix them. acrylic glazing sheets can last for years with regular maintenance, but when it’s time, they are easily removed too.

7. How Can I Get A Quote?

To receive a standard or bespoke quote, just get in touch with our experienced team today. We’re excited to create a custom sheet that fits your vision perfectly and answer all your questions along the way.

Sheet Plastics’ secondary glazing is transparent, easy to install, and simple to maintain. Take advantage of our custom cutting service for a completely bespoke finish for all your windows. Our weather-resistant sheets provide a modern replacement of double glazing at a fraction of the price.

If you’re unsure about the thickness, polish or overall quality of the product, order a sample to see what works best for your space. Alternatively, give us a call at 01455 817469 to discuss the order process.

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