Maximum Opening Width · Melbourne Manufactured

Stacker uPVC Windows Melbourne

Stacker windows solve a specific problem: how to open a wide window frame without the complexity of bi-fold hardware or the size limitations of standard sliding configurations. Multiple operable panels slide in the same direction and stack behind a fixed end panel, leaving the majority of the frame opening completely clear. The smooth top-hung operation and large clear aperture make stacker windows a compelling choice for wide openings where maximum ventilation and view are the priority.

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Stacker uPVC window Melbourne — closed showing multiple panel horizontal configuration

Stacker uPVC window open showing panels stacked behind fixed panel for maximum opening

Key Features

Stacker uPVC Windows — Features & Benefits

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Multiple panels stack at one end

All operable panels stack behind a fixed panel for maximum clear opening width.

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Top-hung smooth operation

Panels hang from top track for smooth, debris-resistant sliding operation.

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Maximum ventilation

Clear opening width significantly greater than equivalent standard sliding window.

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Double glazed standard

Argon-filled double glazed units with Low-E coating as standard.

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Custom panel count

3, 4 or more panels available depending on opening width requirements.

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Custom sizing

Manufactured to your exact dimensions at our Carrum Downs factory.

Multiple Panels, Maximum Opening

A standard 2-lite sliding window opens approximately half its width — one panel slides behind the other. A stacker window with three or four panels can open up to three-quarters or more of the total frame width by sliding all operable panels to stack behind a single fixed panel. This dramatically larger clear aperture provides significantly better ventilation and an unobstructed view through most of the opening. For wide kitchen servery windows, wide living area windows and other large openings, stackers deliver what conventional sliders cannot.

Stacker uPVC window fully open showing multiple panels stacked at one end leaving maximum clear opening

Top-Hung for Smooth Operation

Stacker windows use a top-hung track system where the panels hang from the top rail and are guided at the bottom. This arrangement means the panels glide smoothly regardless of the floor or sill surface, without the accumulation of dirt and debris in a bottom track that can affect ground-running sliders. The top-hung system also allows the bottom rail to be kept low-profile, minimising the sill obstruction.

Common Questions

Stacker uPVC Windows — FAQ

What is the difference between stacker and sliding windows? +

In a standard 2-lite sliding window, one panel slides behind the other, opening approximately 50% of the total width. In a stacker window, multiple operable panels all slide in the same direction and stack behind a fixed end panel, opening significantly more of the total width. The larger clear aperture is the primary advantage of stacker over standard sliding.

What is the difference between stacker and bi-fold windows? +

Both open wide apertures, but they operate differently. Bi-fold windows fold accordion-style and can achieve very large openings, but require the panels to project inward (or outward) as they fold. Stacker windows slide horizontally within the frame with no projection. For locations where projection space is not available, stackers are the better choice.

How many panels can a stacker window have? +

Novalite stacker windows are available in 3, 4 and larger panel counts depending on the opening width. The practical limit is determined by the weight of the stacked panels and the structural requirements of the frame. Contact us with your opening dimensions for a panel count recommendation.

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