Sashless Windows

Understanding sashless windows

Sashless windows are vertically or horizontally sliding panes of glass that appear completely frameless when closed. Instead of a traditional timber or aluminium sash, the glass panels are counterbalanced with concealed weights or spring mechanisms. The result is an elegant edge-to-edge view that maximises daylight, ventilation and design flexibility.

Main advantages

• Uninterrupted sightlines: No meeting rail or bulky sash means more glass and less frame.
• Natural cross-ventilation: Both panes can be opened simultaneously from the top or bottom to create a chimney effect.
• Architectural versatility: Works equally well in heritage renovations and ultra-modern facades.
• Thermal and acoustic performance: High-performance seals, low-E glass and double glazing options rival other premium windows.

Key design choices

Glazing configuration

Most manufacturers offer single, double or even triple glazing with various spacer technologies. Double glazing is the sweet spot for many Australian climates, striking a balance between energy efficiency and weight.

Framing material

Although the panes appear frameless, a slim perimeter frame anchors the mechanism. Aluminium is the most common, but thermally broken aluminium or composite frames further reduce heat transfer.

Hardware & safety

Look for child-safe restrictors, keyed locks and toughened or laminated glass compliant with AS1288. Quality counterbalances should allow fingertip operation without sudden drops.

Australian standards & compliance

The National Construction Code (NCC) mandates safety glazing, fall-prevention devices and energy-efficiency ratings. For the latest updates, consult the Australian Building Codes Board. All suppliers on ArchiPro confirm their systems meet or exceed these requirements.

Comparing alternative window styles

Deciding whether sashless is right for you? Compare them with other popular designs available on ArchiPro:

• Awning windows – hinged at the top, great for rain protection.
• Bifold windows – create a complete wall opening for seamless indoor-outdoor flow.
• Casement windows – side-hung for maximum breeze capture.
• Louvre windows – adjustable blades for fine airflow control.
• Skylights and roof windows – introduce daylight from above.
• Sash windows – the traditional framed counterpart to sashless units.
• Sliding windows – cost-effective and low-profile.
• Tilt and turn windows – dual-action European style.
• Window mouldings – decorative trims to complete the look.
• Security window grilles – upgrade protection without obscuring views.

Cost guide

Pricing varies by size, glazing and hardware. As a rule of thumb, expect $900–$1,500 per square metre for single-glazed aluminium units, rising to $1,800+ for larger double-glazed thermally broken frames. Installation labour typically adds 15–25%.

Installation & maintenance tips

• Hire a specialist: Counterbalance systems require precise calibration; engage an experienced installer.
• Seal it right: Proper flashing and waterproof membranes are vital to avoid hidden leaks.
• Regular cleaning: Use a soft sponge and mild detergent to keep the glass pristine. Avoid abrasive pads on low-E coatings.
• Annual check-up: Test balances, locks and restrictors once a year and lubricate as recommended by the manufacturer.

Buying through ArchiPro

ArchiPro connects you with Australia’s leading sashless window fabricators and installers. Compare specifications side by side, message suppliers directly, and request project-specific quotes—all in one place.