Extendable window bars with 3 round steel security bars for residential window protection

Extendable Window Bars NZ

Adjustable DIY Security Window Bars

Protect vulnerable windows with practical extendable security bars designed for New Zealand homes.

  • You can install the bars horizontally or vertically to suit different window layouts.
  • Multiple window bars can also be installed in parallel to cover larger areas.
  • Each window bar has a fixed section and an extendable section, allowing the overall width to be adjusted to fit your window.
Round bars are spaced 120mm apart, while square bars are spaced 100mm apart. This spacing maintains airflow and visibility while allowing the fixed side to cover beyond its physical width. For example, Type A has a 340mm fixed width but can effectively cover a wider area when installed with the recommended spacing.

Get Extra Coverage from the Fixed Side

The bars are designed with a set gap between each parallel bar:

  • Round bars are spaced 120mm apart
  • Square bars are spaced 100mm apart.

This spacing maintains airflow and visibility while allowing the fixed side to cover beyond its physical width.
For example, Type A has a 340mm fixed width but can effectively cover a wider area when installed with the recommended spacing.

Expandable Window Bars
Extendable Window Bars Size Comparison
Variants Expandable Side Fixed Side Bars Spaces Bar Type Price
Type A Min: 485mm
Max: 900mm		 340mm 120mm 3 round bars $54
Type B (BLACK) Min: 900mm
Max: 1650mm		 340mm 120mm 3 round bars $81
Type C (BLACK) Min: 630mm
Max: 1100mm		 300mm 100mm 3 square bars $66
Type D Min: 630mm
Max: 1100mm		 420mm 100mm 4 square bars $99
Type E Min: 630mm
Max: 1100mm		 540mm 100mm 5 square bars $108
Expandable Window Bars Installation Example

Find The Right Extendable Window Bars

Measure your window frame and compare recommended options.

Extendable Window Bars

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Frame Measurement
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Best Fit Option

Click "Check Options" to view recommended window bar types and quantities for maximum coverage.

Best Value Option

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Why Extendable Window Bars?

Window Security for Different Areas of Your Home

Extendable window bars can protect vulnerable ground-floor, basement, bathroom, laundry and garage windows. Depending on your window design, they can add a visible physical barrier while allowing ventilation and natural airflow.

Also known as adjustable window security bars, burglar bars, window guards or window grilles, our ready-made steel bars come in sizes covering window widths from 485mm to 1650mm.

Common applications include:

  • Ground-floor and street-facing windows
  • Basement windows
  • Bathroom and laundry windows
  • Garage and sleepout windows
  • Apartments, townhouses and duplexes
  • Infill housing and new residential developments
  • Social housing and privately owned homes
  • Body corporate-managed apartment properties
  • Rental properties, subject to owner approval

For rental, apartment, Kāinga Ora or body corporate properties, obtain the required approval before drilling or modifying the window frame.

Window bars are a security deterrent. They are not a child fall-prevention device and cannot guarantee prevention of entry.

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