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Sash Windows

Timeless sash window design.

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Premium uPVC sash windows crafted as a bespoke sash window system delivering exceptional energy efficiency, smooth operation and high-performance double glazed sash window configurations.

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Product Info

These expertly engineered sash windows offer timeless style for both traditional and modern homes. Designed for precise installation and long-term reliability, they replicate the charm of classic box sash windows while providing advanced insulation, excellent security and reduced maintenance.

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Created as high-quality replacement sash windows, they offer smooth sliding action, robust construction and refined aesthetics suitable for conservation areas, new-build projects and full refurbishments. ​

  • Authentic timber-look styling with sculptured ovolo sightlines and deep bottom rails

  • Slimline sash profiles that replicate traditional box sash windows

  • Bespoke replacement sash windows for conservation homes, renovations and new builds

  • Smooth operation using a precision balanced-load mechanism

  • Tilt-in functionality for safe and easy cleaning from inside

  • Double glazed sash windows included as standard for improved insulation

  • Wide selection of Georgian bars, astragal bars and decorative sash horns

  • Strong security with reinforced PVC-U frames and reliable locking systems

  • Optional PAS 24 upgrades for high-security requirements

  • Low maintenance — no rotting, warping, painting or draughts

  • Engineered as thermally efficient uPVC sash windows for year-round comfort

  • Concealed drainage ensures a clean, streamlined appearance

  • Customisable hardware and colour options for tailored design

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Profile Options
Manufactured using high-performance PVC-U profiles, these uPVC sash windows offer excellent thermal performance, weather resistance and structural integrity. The slim, elegant design enhances aesthetics while delivering smooth operation and long-lasting reliability.
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Purpose-built as advanced sliding sash windows, they outperform timber alternatives in insulation, strength and ease of use.
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Sizes

Available in a wide range of standard and bespoke dimensions, these sash windows can be tailored to suit almost any property.
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Options include both traditional box sash window proportions and modern slimline configurations. With multiple height and width combinations, each unit can be engineered for a precise, made-to-measure fit.
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Let The Light In!
Slim profiles and generous glass areas allow these sliding sash windows to maximise natural light, creating bright, open interiors. The heritage-inspired sash structure delivers a refined aesthetic while enhancing visibility and daylight.
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Optional hydrophilic glass coatings help keep the surface cleaner for longer. As double glazed sash windows, they offer improved insulation, reduced noise and increased security for everyday living.
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Colours

Available in a selection of timeless and modern finishes:
Standard Colours:
• White
Bespoke RAL Colours:
Full custom colour options are available on request.
Glass Options:
Solar • Laminate • Acoustic
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Inspiration & Frequently Asked Questions
  • The Aluna+ Lantern delivers excellent thermal efficiency, durability and weather performance. As a thermally efficient roof lantern, it maximises natural light, improves visibility and provides strong wind, water and air protection while maintaining long-term structural performance.
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Download one of our Aluna Brochures here
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