Retrofit Double Glazing Cost Effectiveness vs Full Replacement

Discover the benefits of retrofit double glazing existing windows vs full window replacement and why retrofit double glazing is more cost effective, sustainable and provides flexibility to retain the characteristics of your home. 

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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Why Retrofit Double Glazing Is More Cost Effective Than Full Replacement

If you are considering double glazing your existing timber windows or doors at home, you've probably come across two options: retrofitting your windows, or replacing them entirely, including the window frames.

Both methods achieve the same end result, a more energy efficient double glazed window. But the difference in cost, wastage and outcome can be significant.

For many Melbourne homeowners, particularly those with original timber windows, retrofitting is not only the more affordable option, it's the smarter one that enables a boost to window performance without having to change the aesthetics of your home and window frames.

What Does Full Window Replacement Involve?

Replacing your windows entirely means removing everything including glass, frames and sills and installing brand new windows from scratch. This process generally involves:

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Demolition of existing frames and surrounding architraves

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Plastering, painting, and preparing the surface around each opening

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Installing New uPVC, aluminium, or timber frames

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Can mean weeks of disruption to your home

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Significant labour costs across multiple trades

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Greater Environmental Impact When Replacing Frames Compared to Retrofitting

For the typical Melbourne home with around 10 to 15 windows, full replacement cost can range between $30,000-$60,000 depending on the size of the windows and the quality of materials used.

For homes that feature original timber frames such as heritage or period homes, full replacement can mean removing cherished elements of the homes that may change the original aesthetic and character of the home.

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How Retrofit Double Glazing Works & Why It’s More Cost Effective

Retrofit double glazing takes a different approach as it involves upgrading your window glass to high performance double glazed units with a process that fits new double glazed glass within your existing timber window frames.

The retrofit process delivers the same double glazing performance but at a fraction of the cost of full replacement. Retrofitting avoids the need to remove window frames, plaster or paint and minimises disruption to the home.

Our retrofit double glazing process typically takes 1-2 days to complete for an average Melbourne home and when our install team completes the project, your home will be in the same state as when they arrived, except with high performance windows.

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Full Window Replacement typically costs 3 to 5 times more than Retrofit Double Glazing.

More Reasons To Retrofit

In addition to the cost savings, there are further advantages when you retain your original timber frames, rather than replacing them.

1

Retrofitting performs just as well as replacement

LightBridge/Optitherm, features toughened safety glass, a Low-E coating, and an argon gas gap that may outperform new high-quality window installations.

It delivers a U-value of 1.4, 75% heat reduction and performs comparably to un-coated triple glazing.

2

You retain the original character of your home

Melbourne is home to a variety of heritage and period homes including Victorian terraces, Edwardian houses, and Federation bungalows.

Replacing the original timber frames changes the look and feel of the home.

3

Timber frames are made to last

if properly maintained, original timber frames are built and designed to last for generations.

Replacing them with cheaper and inferior modern materials can shorten their lifespan and downgrade the character of your home.

4

Retrofitting reduces waste

retaining your timber frames is a more sustainable choice as it avoids the need to manufacture new frames and extends the life of the timber frames that are already in place.

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Find Out If Retrofit Double Glazing Is Right For Your Home

Join over 2,000 Melbourne homeowners who have made the switch to double glazing and are enjoying a happier,healthier and more energy efficient home.

Book a free, no-obligation measure and quote and we'll assess your windows, recommend the right glass, and provide a fixed price with no surprises. Or explre our double glazing cost calculator to get an approximate cost for your double glazing project.

How Much Does it Cost to Double Glaze Windows?

Retrofit double glazing your existing windows can be up to 66% cheaper than window replacement. See our pricing guide for double glazed window costs or use our double glazing calculator for an approximate cost for your project. 

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