If you’ve been researching ways to make your home quieter, warmer in winter and cooler in summer, you’ve likely come across double glazing. But what’s the cost of double glazed windows in Melbourne, and is it worth the investment? This guide breaks down double glazing prices, from full replacements to retrofit windows cost, and explains the benefits so you can make an informed decision.
Get a Free Quote
The most straightforward answer is that the cost to double glaze your windows can vary considerably. Replacement double glazing, which involves the complete removal of your current windows and glass, typically costs between $1,200 and $1,500 per square metre installed.
In Melbourne’s variable climate—where hot summers and cool winters demand year-round temperature control—double glazing offers not just comfort but long-term savings. For many homeowners, retrofitting existing windows with secondary glazing is a more convenient and cost-effective solution, allowing you to enjoy the benefits of improved insulation and reduced noise at a fraction of the replacement price.
Understanding Double Glazing Cost (Per Square Metre & Window)
The cost of double glazing varies depending on the type of installation:
- Replacement double glazed windows: $1,200–$1,500 per m²
- Retrofit windows cost (secondary glazing): $500–$600 per m²
Retrofit glazing keeps your existing frames and adds a discreet second pane inside, making it far more cost-effective while still delivering strong thermal and acoustic benefits.
Then you have secondary glazing which is easily added to your existing window and can cost between $ 500 per square metre up to $ 600 per square metre, which is a lot cheaper than replacement double glazing.
The secondary double glazing window system on top of your current window is the perfect fit for people who want a cost-effective solution to their noise and insulation problems.
No need to remove the glass in your windows, just a quick and cost-effective retrofit of your current windows which means saving you time and money is achievable with a retrofit double glazing system.
Stop Noise has been fixing peoples noise problems with secondary glazing for the past 25 years and are happy to discuss your issues over the phone or in your home.
Why replace your perfectly good window when we can turn your existing glass window into the ultimate double glazed window system.
If you want new windows, glazing, want to know the cost of double glazing then contact us today or simply fill out our contact form and we’ll get back to you with a price and a free quote.
Detailed Guide to Double Glazing Prices in Melbourne
Double glazing prices depend on more than window size.
- Type of system – Full replacement has a higher cost of double glazed windows but offers brand-new frames and long life. Secondary glazing keeps existing frames, lowering the cost of double glazing and minimising disruption.
- Glass specification – Acoustic laminated or Low-E glass increases double glazing cost but improves noise and energy performance.
- Frame material – uPVC is highly efficient, aluminium is durable, timber suits heritage homes — each affects double glazing prices.
- Project size & complexity – Small retrofits may cost a few hundred; full-house replacements can reach tens of thousands.
- Location factors – Multi-storey access, heritage rules, and property layout can add to the cost of double glazing.
Why Retrofit (Secondary Glazing) Offers Better Value
Secondary glazing gives you most of the benefits of full double glazing — noise reduction up to 70%, improved insulation, reduced condensation — at around half the price.
Because it’s fitted inside your existing frames, there’s minimal disruption, and heritage windows can be preserved. Over time, the savings on heating and cooling bills can make retrofitting one of the most cost-efficient home upgrades available.
Read more about our Add-On Double Glazing solutions.
Single glazing versus double glazing
Windows with single glazing get made with a single piece of glass. Which means the only separation from the outside of your home is one piece of glass. A single glass window ranges from 3 mils to 10 mils, and this thickness doesn’t give your home adequate insulation. And believe it or not, a window with single glazing can be 20 times less efficient than a wall when it comes to energy loss from the inside of your home.
Windows with double glazing use two separate pieces of glass which are separated by air. This layer of air provides an insulation barrier. The noise reduction is up to 70% reduced sounds being able to enter through the windows, and the insulation of your home can get improved by 60%.
Our system gets made at our Carrum Downs Melbourne plant using only top-quality materials and equipment, which means it is Australian owned and designed with quality guaranteed.
So the benefits of fitting double glazing are improved thermal insulation, incredible noise reduction and sturdy panels for extra security and strength.
Windows with quality double glazing reduce the cold in the winter and have seals that are airtight to help keep out dust, pollution and the extreme heat in the Melbourne spring and summer.
Window Double Glazing Benefit
Climate control
- Melbourne’s unpredictable weather makes double glazed windows a smart choice for year-round comfort. The superior insulation of a double glazed window replacement keeps your home cool in summer and warm in winter.
Noise Reduction
- A double glazed window system can block up to 50–70% of outside noise — ideal for busy streets, airports, or inner-city living. Stop Noise’s quality glass ensures proven soundproofing for a quieter home.
Improve Energy Efficiency
- By reducing heat transfer, double glazing keeps indoor temperatures stable, helping you use less heating and cooling and save on electricity bills.
Increase Safety
- Double glazed windows are more resistant to breakage and difficult to force open, providing extra home security.
Protect Your Interiors
- Limiting heat and UV exposure helps prevent fading and damage to furnishings, curtains, and flooring.
Increase Property Value
- Installing double glazing not only boosts comfort and security but also adds to your property’s resale appeal.
Frequently Asked Questions
How much are double glazed windows in Australia?
Many people ask us for the price of double glazed windows, and we tell them that it depends on a few factors. When estimating the cost of double glazed windows, the size of the pane comes into consideration, the type of material used to frame them and the existing materials and devices you may have around the area.
Will double glazed windows save me money in the long run?
The answer is yes. While the installation on all your windows may seem expensive at the start, there are long-term savings over the years. You’ll reduce cost in heating and air conditioning, which means decreased electricity bills. And the window’s strength means they won’t need to get replaced due to smashing or cracking easily.
How long do double glazed windows last?
The life span of these windows is 40 years or more.
Can I get double glazing over my current windows?
Yes, our specially designed system which is Australian made and designed gets especially fitted to go over any current window, which means you’ll keep the costs down of having to get entirely new windows.
How much will double glazing cost per window in Melbourne?
From around $500–$600 per m² for retrofitting and $1,200–$1,500 per m² for full replacement.
What’s the difference between double glazing cost and secondary glazing cost?
Secondary glazing retrofits your existing windows and costs 50–60% less while offering strong thermal and acoustic benefits.
Stop Noise is the ultimate solution for reducing noise through your windows.
Our double glazing system gets easily added to current windows at half the cost of double glazed windows. Which means you don’t need the high price of new windows. And the thicker glass provides for superior soundproofing and noise reduction solutions inside all properties.
If you want a price for double glazed windows, then contact us today.
This entry was posted in Blog on March 12th, 2023 by Ron Adams.
