Key Takeaways
- Windows are one of the most common entry points burglars use to break into Australian homes, second only to unlocked doors.
- Double glazing adds a second pane, an insulating gas-filled gap and toughened glass, all of which absorb impact and slow forced entry.
- Reinforced frames with internal beading stop the glass being levered out from the outside, unlike older single-glazed frames.
- Multi-point locking systems, key-locking handles and tamper-proof screws work together to resist prying, snapping and drilling.
- All Ultimate Windows double-glazed units meet Australian Standards and are backed by a 12-year guarantee.
Windows are one of the most common entry points burglars use to break into Australian homes, second only to doors that have been left unlocked. Older, single-paned windows with weak frames are far easier to force open than modern double-glazed uPVC windows, which is one reason double glazing has become a standard upgrade for homeowners who care about security as much as comfort.
Double glazing is the use of two panes of glass, separated by a sealed, insulating gap, within a single window unit. Modern double-glazed units typically feature reinforced frames and multi-point locking systems, which together create a much stronger barrier against opportunistic criminals than a standard single-glazed window.
The extra pane of glass creates a second layer of defence. The air or gas-filled gap between the two panes acts as a cushion, absorbing and dispersing the force of an impact rather than shattering outright. Combined with toughened glass, which is significantly stronger than standard glass, and internal beading that prevents the glass from being removed from outside, double glazing makes forced entry slower, noisier and far less appealing to an intruder looking for an easy target.
Two Panes Are Better Than One
A single-pane window is simpler to manufacture, cheaper to buy and easier to replace if broken. That is largely where its advantages end. Single panes offer poor energy efficiency, which drives up heating and cooling costs, meaning any upfront savings are often lost within a few years. Double glazing offers significantly better energy efficiency thanks to the insulating space between the two panes, making it a stronger long-term investment on both comfort and security grounds.
Unlike single glazing, double glazing also provides UV protection that helps prevent fading of furniture and carpets, along with substantial noise reduction that makes a home a quieter, more comfortable place to live. The table below summarises how the two options compare specifically from a security standpoint.
| Security Feature | Single-Glazed Windows | Double-Glazed Windows |
|---|---|---|
| Impact resistance | Low, shatters easily | High, second pane absorbs force |
| Time to force entry | Fast | Slower, deters opportunistic burglars |
| Noise during a break-in attempt | Minimal | Louder, more likely to alert occupants |
| Compatible locking systems | Basic, single-point | Multi-point, reinforced |
| Overall deterrent value | Low | High |
The Role of the Window Frame in Security
The frame is the foundation of any window, so a good quality frame that is installed properly is essential for overall security. A sturdy frame is crucial to the effectiveness of a window’s locking mechanism, and a strong frame is far harder for an intruder to pry open with a crowbar than a weaker one.
A window cannot function without its frame, as the frame secures the glass in place and prevents it from being easily removed from the opening. The frame also provides the structure to which locks, hinges and other security hardware are attached, all of which help prevent forced entry.
Weak, damaged or poorly maintained frames can warp, twist or even break under force, rendering the locks useless. Upgrading to frames made from modern, advanced materials such as uPVC means significantly less ongoing maintenance than traditional alternatives like timber, while still holding their shape and strength over time.
Toughened Glass vs Standard Glass: A Key Security Upgrade
Toughened glass, also known as tempered glass, is a type of safety glass that has been heat-treated to be up to five times stronger than standard annealed glass, making it far more resistant to impact. If it does break, toughened glass shatters into small, rounded pieces rather than the large, sharp shards produced by standard glass, which is also safer for anyone nearby.
Toughened glass also has a higher resistance to thermal stress, meaning it performs more reliably when exposed to high heat and sudden temperature changes, a common feature of the Australian climate. For homeowners looking for better noise reduction, toughened glass is worth prioritising, as it offers stronger sound insulation than standard glass.
Locking Mechanisms: Ensuring Maximum Break-In Resistance
A layered approach to locking hardware is what ultimately determines how well a window resists common forced entry techniques such as prying, snapping and drilling. The most effective double-glazed units combine several types of security hardware:
- Multi-point locking systems: multiple bolts engage into the window frame at various points along the entire edge, distributing locking force evenly and making it extremely difficult to pry the window open from any single point.
- Key-locking handles: these require a key to lock and unlock the window, so the handle cannot be manipulated from outside, even if the glass is broken.
- Tamper-proof screws: used to secure reinforced strike plates, these are far more resistant to shearing or removal under force than standard screws.
The same principles apply to entry doors. Pairing secure windows with well-specified double-glazed doors ensures there is no obvious weak point for an intruder to target elsewhere on the property.
Noise Reduction as an Indirect Security Benefit
Even if security is not the primary reason for choosing double glazing, the noise reduction it provides has a genuine, indirect security benefit. By reducing ambient outside noise, occupants are more likely to hear unusual sounds around the home, allowing for a quicker response to a potential threat.
Sound reduction works both ways. It improves privacy and makes it harder for anyone outside to determine what is happening inside, or whether the home is currently occupied. Trying to break through two panes of glass also creates far more noise than breaking a single pane, which is more likely to alert occupants or neighbours. Because burglars generally favour quiet, low-risk targets, double glazing acts as a genuine deterrent.
Security Compliance and Australian Standards
For genuine security and safety benefits, any double-glazed window installed in Australia should meet the relevant Australian Standards for glazing and building products. All double glazing supplied by Ultimate Windows is compliant and clearly labelled, and comes with an industry-leading 12-year guarantee for extra peace of mind.
For homeowners who want to go further, the Australian Institute of Criminology publishes independent, evidence-based research on burglary prevention that can help inform broader home security decisions alongside your choice of windows and doors.
If you are ready to strengthen your home’s security while also improving comfort and energy efficiency, request a free, no-obligation quote from the Ultimate Windows team today.
Frequently Asked Questions
Does double glazing really make a home more secure?
Yes. Double glazing combines two panes of glass, toughened glass options, reinforced frames and multi-point locking systems, all of which make forced entry significantly slower, louder and more difficult than with a standard single-glazed window.
What is the strongest type of glass for home security?
Toughened glass is the strongest commonly used option, as it is up to five times stronger than standard glass and breaks into small, rounded pieces rather than sharp shards, making it both safer and more resistant to forced entry.
Do double-glazed windows need extra security features?
Most modern double-glazed windows already include multi-point locking, key-locking handles and tamper-proof screws as standard, so no separate security upgrade is usually required, though homeowners can request additional hardware for extra peace of mind.
Are double-glazed windows compliant with Australian security standards?
Yes, provided they are supplied by a reputable manufacturer. All Ultimate Windows double-glazed units are compliant with Australian Standards, clearly labelled, and backed by a 12-year guarantee.
