Extendable Window Bars
You can install the window bars either horizontally or vertically
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Extendable Window Bars | 3 Round Bars | 485-900mm Wide x 340mm High (A)
Regular price $54.00 NZDRegular price$54.00 NZDSale price $54.00 NZD -
Extendable Window Bars | 3 Round Bars | 900-1650mm Wide x 340mm High (B)
Regular price From $81.00 NZDRegular price$81.00 NZDSale price From $81.00 NZD -
Extendable Window Bars | 3 Square Bars | 630-1100mm Wide x 300mm High (C)
Regular price From $66.00 NZDRegular price$66.00 NZDSale price From $66.00 NZD -
Extendable Window Bars | 4 Square Bars | 630-1100mm Wide x 420mm High (D)
Regular price $99.00 NZDRegular price$99.00 NZDSale price $99.00 NZD -
Extendable Window Bars | 5 Square Bars | 630-1100mm Wide x 540mm High (E)
Regular price $108.00 NZDRegular price$108.00 NZDSale price $108.00 NZD
Extendable Window Bars Size Comparison
| Variants | Expandable Heights | Fixed Widths | Spaces Among Bars | Bar Diameters | Bar Type | Price |
|---|---|---|---|---|---|---|
| Type A | Min: 485mm Max: 900mm |
340mm | 120mm | Outer: 16mm Inner: 12mm |
3 round bars | $90 |
| Type B | Min: 900mm Max: 1650mm |
340mm | 120mm | Outer: 16mm Inner: 12mm |
3 round bars | $135 |
| Type C | Min: 630mm Max: 1100mm |
300mm | 100mm | Outer: 20mm Inner: 15.88mm |
3 square bars | $110 |
| Type D | Min: 630mm Max: 1100mm |
420mm | 100mm | Outer: 20mm Inner: 15.88mm |
4 square bars | $165 |
| Type E | Min: 630mm Max: 1100mm |
540mm | 100mm | Outer: 20mm Inner: 15.88mm |
5 square bars | $180 |
Extendable Window Bars
Recommendation Tool (Beta)
The tool below recommends suitable window bars for your use. Since this tool is a beta version, please double-check the measurements before making a purchase, and confirm your window/door frame measurements in the customer note section on your cart page.
Please click "Check Options" below to begin.
Important Note: Window bars are more durable when they are NOT fully extended.
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Frame Measurement
(Inside Window / Door Frame)
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About Extendable Window Bars
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Reliable Path to Burglar-Proof Windows
DIY Xpanda's expandable window bars are often chosen by window repair agents, property management/maintenance companies, security professionals, and many other individual businesses/ homeowners, due to their flexibility in sizes and high resiliency in many different applications.
These window bars offer an affordable and reliable DIY home security solution to achieve burglar-proof home and business. These window bars can secure windows from the inside, especially useful in high-crime areas or when the property will be unoccupied for an extended period, suitable for securing ground-level and basement windows and vulnerable upper-level windows at residential and commercial properties.
These DIY expandable window bars can also be used in conjunction with other security measures such as alarm systems, motion detectors, and security camera to secure your windows and families.
These window protection bars are known by many different names due to the wide range of product variations available in the market. The following are examples of these other names, all serving one purpose: To enhance your window security, and safeguard your home and family as well as business and commercial properties.
How to Choose and Install Window Bars
How to install Extendable Window Bars
Step 1: Measure Inside Your Window Frame
First things first, let's measure the inside of your window frame.
Particularly inside the window frame's reveal.

This step is important because it will help you decide whether to install the bars vertically, horizontally, or even use multiple bars side-by-side. Take your time with this part—no need to rush. Think about which windows or doors you want to secure the most to protect your home.

Also, to retain rigidity in the middle of the bars, do not exceed the maximum expanded width/height.
So if you have a window size that is 900mm width by 900 mm width, you would not want to choose the window bar that extends to 900 or 905mm, rather choose that extends to something like 1100mm or 1650mm.
<Round or Square Bars>
One thing to note, if you are choosing square bars, you can install the expanding window security bars on top of the frame / reveal in addition to installing them inside the frame (window sill)


Step 2: Gather Your Tools and Materials
Before we get started, let's make sure we have everything we need.
Here’s a list of tools and materials:
- DIY Xpanda expandable window security bars
- Measuring tape
- Pencil or marker
- Drill with the right drill bits
- Screws and anchors (included in the expandable window security bars)
- Screwdriver
- Level
Step 3: Mark the Mounting Points
Using your measurements from Step 1, mark the spots on the window frame where you’ll drill the holes for the mounting brackets. Make sure the marks are level and evenly spaced. Double-checking your marks now will save you from any hassles later on.
Step 4: Drill the Holes
Now, it’s time to drill the holes. Be gentle and precise, using the marks as your guide. If you’re drilling into a tougher surface like masonry or concrete, use the appropriate drill bit and anchors. Take it slow and steady.

Step 5: Attach the Mounting Brackets
Next, attach the mounting brackets to the window frame with the screws and anchors. Make sure they’re nice and tight. The brackets need to be stable to keep the expandable window bars secure.

Step 6: Install the Expandable Window Security Bars
Expand the window security bars to fit the width of your window frame. Place them into the mounting brackets and make sure they’re aligned properly. Tighten any adjustment screws or bolts to lock the bars in place.

Here are more detailed breakdowns of how to screw the expandable window security bars:
https://www.youtube.com/watch?v=JGdsgqaYNW4
Step 7: Test the Security
Give the expandable window security bars a gentle push and pull to check their stability. They should be firmly in place without any wobbling. If they feel loose, tighten the brackets or adjustment screws a bit more.
Make any last adjustments to ensure everything is just right.
Check all screws and brackets to make sure they’re tight, and clean up any debris from the installation.
Window Bars Recommendation Tool (Beta)
How to install Extendable Window Bars
Step 1: Measure Inside Your Window Frame
First things first, let's measure the inside of your window frame.
Particularly inside the window frame's reveal.

This step is important because it will help you decide whether to install the bars vertically, horizontally, or even use multiple bars side-by-side. Take your time with this part—no need to rush. Think about which windows or doors you want to secure the most to protect your home.

Also, to retain rigidity in the middle of the bars, do not exceed the maximum expanded width/height.
So if you have a window size that is 900mm width by 900 mm width, you would not want to choose the window bar that extends to 900 or 905mm, rather choose that extends to something like 1100mm or 1650mm.
<Round or Square Bars>
One thing to note, if you are choosing square bars, you can install the expanding window security bars on top of the frame / reveal in addition to installing them inside the frame (window sill)


Step 2: Gather Your Tools and Materials
Before we get started, let's make sure we have everything we need.
Here’s a list of tools and materials:
- DIY Xpanda expandable window security bars
- Measuring tape
- Pencil or marker
- Drill with the right drill bits
- Screws and anchors (included in the expandable window security bars)
- Screwdriver
- Level
Step 3: Mark the Mounting Points
Using your measurements from Step 1, mark the spots on the window frame where you’ll drill the holes for the mounting brackets. Make sure the marks are level and evenly spaced. Double-checking your marks now will save you from any hassles later on.
Step 4: Drill the Holes
Now, it’s time to drill the holes. Be gentle and precise, using the marks as your guide. If you’re drilling into a tougher surface like masonry or concrete, use the appropriate drill bit and anchors. Take it slow and steady.

Step 5: Attach the Mounting Brackets
Next, attach the mounting brackets to the window frame with the screws and anchors. Make sure they’re nice and tight. The brackets need to be stable to keep the expandable window bars secure.

Step 6: Install the Expandable Window Security Bars
Expand the window security bars to fit the width of your window frame. Place them into the mounting brackets and make sure they’re aligned properly. Tighten any adjustment screws or bolts to lock the bars in place.

Here are more detailed breakdowns of how to screw the expandable window security bars:
https://www.youtube.com/watch?v=JGdsgqaYNW4
Step 7: Test the Security
Give the expandable window security bars a gentle push and pull to check their stability. They should be firmly in place without any wobbling. If they feel loose, tighten the brackets or adjustment screws a bit more.
Make any last adjustments to ensure everything is just right.
Check all screws and brackets to make sure they’re tight, and clean up any debris from the installation.
Terminologies
Window Bars are often called with different names:
Our window bars are also often called as diy window security bars, burglar bars, diy burglar bars, window barriers, etc.
They all indicate the same protective measurement, and our steel window bars are highly adjustable in size and reliable.
Examples of other names can be:
- Adjustable bars
- Adjustable security bars
- Adjustable security window bars
- Adjustable window bars
- Adjustable window security bars
- Anti theft window bars
- Anti theft and break-in grills
- Bars on a window
- Burglar bars
- Burglar guards
- Burglar proof windows
- DIY security bars for windows
- Expandable Bars
- Expandable window bars
- Expandable window security bars
- Expanding security grilles
- Indoor window security bars
- Interior burglar bars
- Interior security bars
- Internal window bars
- Intruder bars
- Metal bars for windows
- Metal covers for windows
- Modern window bars
- Portable window bars
- Removable bars
- Removable security bars
- Retractable window bars
- Security bars
- Security grates for windows
- Security grills for windows
- Security panels for windows
- Security rods
- Steel burglar bars
- Steel security bars
- Steel window crates
- Steel window grill
- Temporary window bars
- Window barricade
- Window barriers
- Window glazing bars
- Window grates for home windows
- Window grill
- Window grill bars
- Window grill guard
- Window guard bars
- Window guards
- Window lock bars
- Window lock enhancement bars
- Window protection bars
- Window protection barriers
- Window safety bars
- Window safety guard
- Window security bars
Again, they all serve the same function: To enhance your home window security.
Window Bars vs. Clear-Guard
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Window Bars
Steel / Extendable Length
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Clear Guard
Polycarbonate Slats / Fixed Length
Extendable Window Bars are adjustable, visibly strong, and still the best choice if you want a powerful visual deterrent. Their “tough look” alone can scare off intruders before they even try.
Clear-Guard, on the other hand, is designed for those who prefer subtle security. It won’t scare intruders at first glance, but once tested, it performs with steel-like strength.
Both products are excellent — it simply depends on your priorities:
- Choose Window Bars if you want maximum deterrence and visible strength.
- Choose Clear-Guard if you want modern style, clear views, and invisible security.
For larger-scale and/or compliance-specific installations, our parent company, Xpanda Security, offers fully engineered custom systems.
Looking for a high quality Window Mesh?
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Check It Out
Our DIY products are designed to protect against human intrusions.
BUT if you're looking for a preventative measure against insects and bugs, window screens can help!
Check out our partner Stay Safe Home Plus and their magnetic insect screens!
They offer custom-made magnetic window screens that fit your windows perfectly and are built to last. -
CUSTOMER TESTIMONIALS
It would be tremendously helpful if you could share your experience with us on Google Reviews. If you're comfortable, including photos of the products would also help others visually understand how these DIY security solutions can be implemented.
Click here to leave a review on Google.
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