Secondary Glazing Kits
Our DIY secondary glazing kits are helping homes and commercial buildings across the UK stay warmer, quieter and more energy-efficient. Our kits offer an affordable solution to cold draughts and your rising energy bills, by improving thermal insulation and reducing condensation.
With easy-to-install secondary glazing, you can add a second layer over your existing windows using an acrylic sheet, without any mess. This creates an insulating air barrier that keeps the warmth in and the cold out, as well as minimising outside noise. It’s an ideal option for listed buildings or anyone looking for an affordable alternative to double glazing.
We offer a range of secondary glazing from magnetglaze to trackglaze. These kits are very simple to set up and maintain, with no need for extensive tools or expertise. For more detailed guidance on installation watch our detailed videos below.
Browse our kits today to stay warm, save money and enjoy a more comfortable home.
MagnetGlaze
Magnetglaze is a simple and effective system for secondary glazing. It uses two self-adhesive strips: a metal strip for the window frame and a magnetic strip for the plastic sheet. Ideal for reducing drafts and noise, it's available in 5m kits or 30m bulk packs for easy handling and fitting. For larger or draftier windows, the 25mm wide Magnetglaze Extreme version offers stronger grip. Please note, it's designed for internal use only and should not be fitted to skylights or doors.
Installation
- Measure the window up to where the steel strip will be placed.
- Ensure at least a 20mm mounting surface.
- Add 25mm to both vertical and horizontal measurements to get the sheet size.
- For Magnetglaze, measure lengths A + 25mm and B to determine how much is needed.
- Clean and degrease the window surround.
- Attach magnetic strips to the plastic sheet edges.
- Position the panel and mark the window frame.
- Stick the metal strips inside the pencil marks.
- Attach the glazing panel and leave for 24 hours to allow bonding.
MagnetGlaze Pro
Magnetglaze Pro is a simple secondary glazing system that uses magnetic fixing with neat plastic capping for a clean finish. It’s designed for internal use on fixed window frames with 2, 3, or 4mm plastic sheets. It’s not suitable for use with glass or ceiling/roof lights for safety reasons. Steel tape adheres to the window frame, and the magnetic tape connects to the rigid PVC capping. No special tools are required, and the system looks tidy when mitred with the included mitre bead.
Installation
- Measure the window frame up to where the steel strip will go. Ensure a 20mm mounting surface.
- Add 28mm to both vertical (A) and horizontal (B) measurements for the sheet size.
- You’ll need 2 lengths of A + 33mm and B + 33mm for your window.
- Clean the window frame for good adhesion.
- Attach Magnetglaze Pro strips to the plastic panel edges.
- Fit the panel to the window, mark the frame, and attach the steel strip.
- Place the panel, leaving 24 hours for adhesive to bond.
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2440mm MagnetGlaze Pro Secondary Glazing Strips - Brown£16.79 . £13.99 £13.99 Excl. Tax -
MagnetGlaze Extreme
Magnetglaze Extreme is designed for large or draughty windows, offering strong grip with 25.4mm magnets and steel, ideal for heavy plastic glazing and windy conditions. It provides effective heat and noise insulation, while the pane remains easy to remove and reattach. Magnetglaze Extreme is stronger than the regular Magnetglaze system, recommended for smaller windows. Both systems use steel tape on the window frame and magnetic tape on the glazing panel for a neat finish. Not suitable for glass, doors, or roof lights. Full installation instructions and kits are available.
Installation
- Measure the window and frame where the steel strip will go (vertical "A" and horizontal "B"). Ensure at least a 30mm mounting surface.
- Add 55mm to both A and B to determine the size of the sheet.
- You’ll need 2 lengths of A + 55mm and 2 lengths of B.
- Clean the window frame.
- Apply the magnetic strip to the plastic sheet edges.
- Hold the panel in place, mark the frame, then attach the steel strip.
- Click the panel into place and let it bond for 24 hours.
SuperGlaze
Superglaze is a 2-part secondary glazing system suitable for 3mm or 4mm plastic or glass sheets. The base section holds the sheet and screws into the window frame, while a cover snaps into place, concealing the screws for a neat finish. It can be mitred for clean corners and offers effective insulation for heat retention and noise reduction.
Installation
Tools Needed:
- Fine-toothed saw
- mitre block
- tape measure
- bradawl
- screwdriver
Instructions:
- Measure the visible glass area (A for vertical, B for horizontal). Add 16mm to each.
- Ensure at least 20mm mounting surface per side.
- For Superglaze sides, add 39mm to A; for top/bottom, add 39mm to B.
- Snap cover into base, cut Superglaze strips with an added 23mm.
- Mitre corners at 45°.
- Attach base to panel edges, fix to window frame with screws, and replace cover strips without force.
ClipGlaze
Clipglaze flexible secondary glazing offers easy installation and has been providing heat and noise insulation for over 60 years. The flexible capping is fitted to the glazing sheet edges and secured with nylon turn button clips, allowing for easy removal for cleaning and reuse. Its flexibility makes it ideal for curved or arched windows. The edging strip may appear kinked due to coiling but softens when warmed. This system is perfect for insulating windows and ensuring access when needed, providing reliable insulation for decades.
Installation
- Mark 5cm from the end of the edging strip and cut carefully at the corners.
- Fit the edging strip around the sheet, marking each corner as you go.
- Place clips 5cm from each corner and space them 20-25cm apart along the edges.
- Position the sheet evenly over the frame.
- Attach clips at the bottom, top, and sides to secure the sheet.
- Ensure the sheet is clean and dry before installation.
EasyGlaze
This glazing system provides heat and noise insulation using 2mm plastic sheets. The base section has adhesive tape and sticks to the window frame, while the glazing sheet is placed in the frame. A cover strip clips into place, securing the sheet and creating a thermal seal. The system can be easily mitred for a neat finish and is for internal use only. Glass is not suitable for this product, and there should be at least 15mm of flat surface around the window for proper installation.
Installation
- Measure the visible glass.
- Add 12mm to A and B for the sheet size.
- Ensure at least 15mm of mounting surface.
- Cut two lengths of A + 25mm and B + 25mm.
- Attach Easyglaze strips to the panel edges.
- Mark the frame and clean the surface.
- Apply the adhesive base to the window frame.
- Place the panel and press the cover strips in place.
TrackGlaze
Trackglaze is a sliding secondary glazing system using 4mm glazing sheets, offering insulation and easy access to outer windows. It uses PVC double sliding tracks on all four sides of the window, with a bristle seal for a tight fit and a finger pull handle for easy operation. The system is easy to install with self-adhesive tape on each component, providing excellent thermal and noise insulation. Tracks can be reinforced with additional fixings if needed for a secure fit.
Installation
Tools Needed:
- Fine-tooth saw
- Pencil
- Tape measure
- Gloves
- Scissors
Instructions:
- Measure the window frame (A horizontally, B vertically).
- For glazing height, subtract 13mm (glass) or 12mm (acrylic/polycarbonate) from B.
- For glazing width (A), add 4mm for a 2-panel system or 8mm per additional panel.
- Clean the frame, cut and install top/bottom tracks (A), then side tracks (B-25mm).
- Apply Bristle Seal to rear and front panels.
- Insert panels into tracks, ensuring seals align.
- Add finger pull angle to front panel for easy sliding.
Cost-Effective Ways to Upgrade Your Windows
Our DIY secondary glazing kits are the most cost-effective alternative to replacing your existing windows and much more energy-efficient too. Just tell us your measurements and Sheet Plastics will cut your sheets to any size or shape you require.
Every window is different, but we’ve got you covered with a wide range of kits suitable for any style. Choose from magnetic, fixed or sliding kits to find the perfect fit for your window. The kit will include an acrylic glazing sheet custom-cut to your exact measurements, paired with a flexible PVC or adhesive edging strip for secure installation and a seamless finish.
Our acrylic secondary glazing can provide you with the same look as glass, but is over 10 times stronger. It provides added security, is lightweight and is easy to maintain.
How to Fit DIY Secondary Glazing?
Fitting your DIY secondary glazing is a simple and easy process. Here are some quick installation steps:
- Clean your window frame (not the acrylic sheet)
- Measure your frame
- Cut the magnetic or adhesive tape to match the size of your window frames
- Apply the adhesive to your frame
- Peel off the first protective film from your acrylic sheet
- Apply the adhesive to the acrylic sheet
- Attach the sheet to your frame
- Peel off the second protective film
How to Clean Secondary Glazing
If you’re wondering how to clean secondary glazing, you’ll be glad to know that it is fairly easy. Use a soft cloth or sponge to regularly wipe away dust, dirt and grime. Harsh chemicals aren't required, warm soapy water works perfectly. We would recommend avoiding abrasive materials that could scratch the surface.
Check for gaps and condensation, as this could indicate the glazing is coming loose or was not installed properly. If your sheets are damaged, it’s often cheaper to replace them than to repair them. With proper care, secondary glazing can last for years and can be easily removed and replaced.
How to Measure and Order DIY Secondary Glazing
To get started, simply measure your window size in millimeters (mm), centimeters (cm) or meters (m). Choose from thickness options of 2, 3 or 4mm.
Once you've provided your measurements, you can also select additional details, such as the polish, curve, holes, screws, adhesives and cleaning supplies. Keep in mind that our acrylic sheets have a maximum size of 3040mm x 2040mm, while secondary glazing sheets are available up to 1500mm x 1500mm. If you’re unsure about the best fit for your space, you can order a 150mm x 150mm sample to check the quality before placing your full order.
To receive a quote for your custom secondary glazing, our friendly, experienced team today. We’ll help guide you through the process and advise what is best for your windows.
At Sheet Plastics, our custom cutting service allows you to get a bespoke finish at a fraction of the cost of double glazing. If you have any questions or need assistance, feel free to contact us or call us at 01455 817469.
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 10% off on all online orders over £150 using the code: WINTER10 (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. 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.
3. 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.
4. 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:
- Clean the frame (this is not your sheet, but the area you’re placing it onto)
- Measure the frame
- Cut the adhesive to these measurements
- Apply adhesive to the frame
- Peel off the first protective film from the sheet
- Apply the adhesive to the sheet
- Apply the sheet to the frame
- Peel off the second protective film
5. 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.
6. 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.
