Sliding Sash Windows
A secure, energy efficient and visually appealing choice for homeowners.
Product Description
Spectus Sliding Sash Windows combine the timeless elegance of traditional timber sash windows with the performance advantages of modern uPVC. Designed to faithfully replicate period aesthetics, these windows feature authentic detailing including run-through sash horns, refined ovolo profiles, slim midrails, and near-invisible joints.
The result is a classic sash window appearance that complements heritage properties, modern homes, and premium developments alike — without the maintenance demands of timber. Legacy windows deliver smooth vertical sliding operation, excellent thermal efficiency, and advanced security, making them a practical and visually stunning choice for any property style.
Technical Info
Legacy Sliding Sash Windows are engineered for performance, durability, and compliance with modern building standards.
Key specifications include:
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24mm argon-filled double glazed units
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Standard U-Value: 1.4 W/m²K
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Thermal Upgrade Available: 1.2 W/m²K
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Multi-chambered uPVC profiles for enhanced insulation
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Warm edge spacer bars to reduce heat loss
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Air Tightness: Class 4
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Water Tightness: Class 6A
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Wind Load: Class A3
Additional options include deep bottom rails, mechanical joints, fire escape facilities, PAS 24 security upgrades, and colour-matched trickle vents.
Authentic Period Styling
Low Maintenance Living
Energy Efficient Design
Why Choose Spectus Sash Windows
Spectus Sliding Sash Windows are designed for homeowners and specifiers who refuse to compromise between appearance and performance. Every element of the window has been carefully developed to mirror traditional timber designs while incorporating modern materials and manufacturing precision.
Unlike timber windows, Legacy windows require minimal upkeep, resist weathering, and maintain their appearance for years. They also offer enhanced thermal efficiency, helping reduce heat loss and improve comfort throughout the home.
With extensive colour options, hardware finishes, glazing choices, and bar layouts, Legacy windows provide exceptional design flexibility — making them suitable for conservation areas, listed buildings (subject to approval), and contemporary homes alike.
Slim. Secure. Efficient
01
Run-through Sash Horns
A new refined decorative sash horn to keep the tradition.
02
Authentic Joints
Upgrade to timber looking mechanical joints.
03
Tilt & Slide Facility
Easily clean your windows from the inside.
Fast and reliable service
Enjoy an efficient turnaround from as little as 7 working days on stock colours, backed by a prompt, reliable service designed for the trade — with fast quotes, simple 24/7 ordering, and over £2 million of stock profile ready to cut and manufacture to your exact sizes, ensuring your projects stay on schedule.
Sliding Sash Lead Times
Technology Behind Legacy Sash Window
Our sash windows incorporate modern engineering innovations to maximise performance:
Multi-Chambered Profiles
Internal chambers use air as a natural insulator to improve thermal efficiency.
Argon-Filled Double Glazing
Denser than air, argon gas significantly reduces heat transfer between panes.
Warm Edge Spacer Bars
Minimise thermal bridging and help retain interior warmth.
Mechanical Joint Construction
Authentic 90° joints recreate traditional timber craftsmanship.
Colour-Matched Woolpile Seals
Improve weather resistance while preserving visual refinement.
Slide & Tilt Functionality
Smooth sash movement combined with easy-clean tilt features for convenience.
Together, these technologies deliver a window that not only looks traditional but performs to modern expectations for energy efficiency, durability, and security.
Everything you need to succeed
It’s tough out there, we know. That’s why we want to give our customers the best chance to succeed by providing premium quality products at a competitive price, backed by exceptional service and support. At Window Warehouse we do all we can to help our customers achieve their goals; because we believe that your success is our success!
