Double Glazing Sash Windows

If you want to improve the energy efficiency of your sash windows while retaining their original aesthetic and charm then retrofit double glazing is a cost effective option for you!

Retrofit Double Glaze Your Existing Sash Windows

Double glazing your existing sash windows enables you to upgrade your windows to double glazed high performance units and improve the efficiency and sustainability of your home.

At RetroFit Double Glaze, we specialise in retrofitting existing timber sash windows to high performance, and energy efficient double glazed glass, to jeep your warmer in winter and cooler in summer.

Sash windows are a traditional style of window that feature moveable panels that slide vertically or horizontally within the frame. Sash windows are common in Melbourne and are much adored for their style and elegance but can have lower efficiency if they are single glazed.

By double glazing your existing sash windows you can improve insulation while rationing the original charm and style of your windows.

Benefits of Double Glazing Sash Windows

  • windows slides

    Preserve your original frames, window style and heritage charm

  • thermal performance

    Reduction in energy usage & costs with improved insulation

  • window security

    Added security with tougher glass

  • wnidow

    Minimise external noise

  • windows door

    Reduction in condensation

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10 year warranty
10 Year Warranty

By retrofitting your sash windows you can also reduce costs by avoiding the need to replace your existing window frames!

When double glazing double hung sash windows, our install team modify the weights to ensure that your double glazed sash windows retain optimal movement and performance.

RetroFit Double Glaze
4.9
Based on 107 reviews
Philip Miles
Philip Miles
00:37 03 Sep 26
Retrofit did a fantastic job in replacing single glazed panes for double glazed units on my house which is about 17 years old. Very professional, tidy and all round great job!
Niall Kennedy
Niall Kennedy
02:06 30 Aug 26
Really great service from Retrofit. Did a great job double-glazing our 1890s sash windows. Very professional, responsive and always on time. Also super neat and cleaned up everything each day. Very impressed with the job. Particular shout outs to Henry, Valentin and Al who have been fantastic!
John Hughes
John Hughes
06:56 26 Aug 26
Good job all round. Staff were pleasant, got the job done in good time, kept it tidy and cleaned up afterwards. Liam and his team did a great job on the install.
Jeff Newman
Jeff Newman
06:54 25 Aug 26
Outstanding Service and WorkmanshipWe recently had the glass in our home windows replaced and upgraded to double glazing through Retrofit Double Glazing, and we couldn’t be happier with the experience.The professional nature of the company was evident from our very first contact with Warren, through to Jarrod, who carried out the measuring and provided the quote, and our installers, Liam and Eddy. The entire process went seamlessly from start to finish.A special shout-out to Liam and Eddy, who took great care in the way they worked in and around our home. Their extremely high level of workmanship, attention to detail and professional manner gave us complete confidence in the work being carried out. They were respectful of our home and left everything neat and tidy.We also appreciated the follow-up communication from the company, keeping us informed about when the work would be carried out. This gave us peace of mind and allowed us to plan ahead.We would highly recommend Retrofit Double Glazing to anyone considering upgrading their existing windows. From the initial contact through to completion, the service, communication and workmanship were exceptional.A fantastic experience from start to finish!
Jason Mathias
Jason Mathias
04:55 25 Aug 26
The RetroFit Double Glaze install team were fantastic! They were on time, very friendly and respectful and did a brilliant job. Highly recommended.
Inna Smith
Inna Smith
05:18 30 Jul 26
Henry, Shane and Shae did a magnificent job. Very professional and efficient. Thanks for your great work. A huge improvement on our old windows.
Anne
Anne
03:14 30 Jul 26
Brilliant job from start to finish. Easy quoting process and staff helpful. On the day the team arrived promptly, and introduced themselves. Valentin and Jasmin were very professional, polite, and eager to make the installation experience positive. They are a great team! Work completed in a timely manner, windows look wonderful, and they cleaned up before they left. Communication through the day as the job progressed was wonderful. Thanks so much.
Henry Whitmore
Henry Whitmore
00:49 23 Jul 26
Warren is the best bloke i’ve ever talked to, great guy. The glass is good too
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The RetroFit Double Glazing Process

Our professional and friendly double glazing install team covers all of metropolitan Melbourne and our install process is straightforward and hassle-free.

1

Measure & Quote

We visit your home and assess your existing sash windows

2

Glass is Custom Made & Delivered

All of our high performance glass is cut to precise measurements

3

Old Glass Removed & Frame Modified for double glazing

Your existing glass is carefully removed, we router out existing frames and install your new glass.

4

Double Glazed Glass Installed

New glass is sealed into place, and all old glass is removed and recycled

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Price Match Guaranteed

Find a better price on the same service and we'll match it!

DIY Double Glaze your sash windows

If you are a DIY enthusiast and want to retrofit double glaze your sash windows yourself we have a DIY double glazing solution.

Double Glazed Windows Installation

Meet our expert team of double glazed windows installers. 

diy double glazed retrofit window installation team

Why Use RetroFit Double Glaze?

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Over 12 Years Experience

We specialise in upgrading existing timber windows and enhancing energy efficiency without altering your home's character.

power effective

Enhanced Home Comfort

Enjoy reduced energy expenses, improved noise reduction, and increased security with our double glazed solutions.

sustainable

Commitment to Sustainability

By improving energy efficiency, our solutions help reduce your carbon footprint, contributing positively to the environment.

Frequently Asked Questions

Yes, most sash windows can be retrofitted with double glazed glass. Our expert team can assess your existing windows and provide a tailored recommendation to suit your needs and budget.

For sure, our team is very experienced working on sash windows projects and will ensure that the functionality is maintained, there are multiple options for different styles of sash windows.

It sure will! Double glazed sash windows reduce heat transfer which means you can decrease your reliance on heating and cooling systems.

If a booking is confirmed we generally have glass ready within four weeks. We will install your new double glazed glass within 3 days when it's available.

Yes, our retrofitting process retains your existing frames so it is a suitable option for your home.

Absolutely! If you are a DIY enthusiast we have a DIY double glazing solution. We provide a comprehensive guide to help you install your new glass with additional guidance if you need it.

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