How DIY Double Glazed Windows Save Melbourne Homes from Heat, Cold & High Bills

Why Melbourne Homes Are Losing Comfort (and Money)

Does a large chunk of your household income get eaten up by energy bills? If yes, then the single-glazed windows installed in your home are most likely to blame. Most Australian homes are still built with single-glazed windows, which act as a major thermal weak spot. 

You’ll be surprised to know that up to 87% of heat enters through these thin windows in summer, and around 40% escapes in winter (YourHome, 2023). 

For Australian households, where nearly 40% of energy is used just to keep the home warm or cool, that kind of thermal leakage is a real problem. But the good news is you can shield yourself from high energy bills by 30% using double-glazed windows. The trapped air between the two glass panels provides robust thermal insulation.

But installing double-glazing windows is an expensive affair, along with some big structural changes. However, in this blog, we will guide you about different types of double glazing, their benefits, and a low-cost DIY solution for your double-glazing window.

What Are Double Glazed Windows and How Do They Work?

A double-glazed window combines two panels of glass or acrylic within the same window frame, with an air or gas-filled gap between them. Double glazing is a proven insulation method as it traps the inside air, which works as natural insulation. 

This trapped air keeps the home warm in winter and cooler in summer.

Why Melbourne Weather Needs Double Glazing Windows

Melbourne’s climate is unpredictable. 250+ heating degree days annually, with winter lows near 6°C and summer peaks over 40°C (BOM). 

Most homes still rely on single-pane windows, which have high U-values (5.6 – 6.7) and are poor insulators.

This causes:

• Sky-high energy bills
• Drafty rooms in winter
• Overheated interiors in summer
• Property value concerns (falling behind 7-star energy rating standards)

According to CSIRO’s 2024 research, poor air tightness caused by leaky windows can increase energy bills by up to 20%. Double glazing is one of the most important and simplest ways to reduce this loss in existing homes.

What Are the Different Types of Double Glazing Solutions?

When it comes to improving insulation through double glazing, Melbourne homeowners typically have two main options, each with its own pros, cons, and cost.

1. Traditional Double Glazing

• Full window replacement is required
• Installation can be disruptive, time-consuming
• Requires a licensed installer or contractor, often adding to the overall cost.
• Pricing includes labour, custom window fabrication, and removal
• Ideal for new builds or full renovations

While traditional glazing offers strong thermal performance, it’s often out of reach for those looking for a quick, affordable upgrade, especially in rental or heritage homes.

2. DIY Double Glazing (Smart & Simple)

• Mounts directly inside the current frame
• Creates a 5-100mm insulating air gap
• Reduces drafts, noise and heat loss
• No construction or tradespeople needed
• Perfect for renters, budget renovations or older homes

This DIY-friendly method delivers noticeable results without the stress or expense of full replacement. At AB Plastics, we offer custom-cut acrylic panels designed to fit seamlessly into your existing window frames.

Amy’s DIY Window Upgrade in Ringwood

In January 2025, we had the opportunity to work with Amy, a homeowner in Ringwood. She was frustrated by the poor thermal insulation of her single-glazed windows, especially during winter. The constant traffic noise outside only made things worse.

“I didn’t want to replace our windows,” she explained. “I just wanted the room to feel warmer and be quieter.”

After Amy got in touch with AB Plastics, we recommended a DIY double-glazing solution using custom-cut acrylic panels.

The result?

• A noticeably warmer lounge with fewer cold drafts
• Significant noise reduction
• An estimated $450 is saved annually on energy bills

“It was surprisingly simple to install,” Amy shared. “Our lounge is finally warm and quiet!”

Acrylic vs. Glass: The Smarter Choice for Double Glazing

Perspex® acrylic outperforms glass in several key areas, especially for double-glazing solutions.

Feature	Perspex® Acrylic	Glass
Thermal Conductivity	0.19 W/mK	0.80 W/mK
Impact Resistance	10–20x stronger	Brittle, can shatter
Weight	50% lighter	Heavy
UV Protection	Blocks 98%	Minimal
Ease of DIY	Easy to handle	Requires professionals

An acrylic sheet is not only safer, but it also insulates better and makes DIY installation truly achievable for Melbourne homeowners.

Why DIY Double Glazing Is a Smart Investment

For many Melbourne homeowners, the tipping point comes when they see the numbers. DIY acrylic double glazing can reduce energy consumption through windows by up to 30%. 

Depending on window size and house insulation, that translates to $300 to $500 in annual energy savings. 

When you factor in the one-time material cost, far less than professional double-glazed windows, the return on investment is often under 2 to 3 years. Thanks to its non-invasive nature, it is also renter and heritage-home friendly.

How AB Plastics Makes Secondary Glazing Easy

AB Plastics simplifies the process for homeowners across Clayton, Dandenong, Springvale, Frankston, and more.

Here’s how:

• Send us your window’s glass measurements
• Get a free quote tailored to your needs
• We will create custom-cut Perspex® panels as per your needs
• Get your DIY kit at your doorstep
• Enjoy easy, no-fuss installation with our step-by-step guidance, with no contractor needed

This hands-on, affordable solution isn’t just about energy; it’s about peace of mind. A quieter, more comfortable and more livable home shouldn’t take months to renovate and thousands to install.

Conclusion

Your windows are leaking comfort and money. But replacing them isn’t your only option.

AB Plastics’ DIY Perspex® double glazing is a proven, affordable solution that gives you:

• Immediate thermal comfort
• Noticeable soundproofing
• Long-term energy savings
• Increased property value

Take control of your home’s efficiency today without expensive renovations.

FAQs for DIY Double-Glazed Windows