AJO Aluminium Windows & Doors
Aluminium sliding window on a contemporary building
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Aluminium Windows

Aluminium Sliding Windows

Horizontal sliding aluminium windows offer a clean, contemporary look with smooth, effortless operation. Ideal for wide openings where a side-hung casement isn't practical, our thermally broken aluminium sliding windows deliver excellent ventilation and maximum glazed area with minimal frame intrusion.

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Horizontal sliding

Sashes glide horizontally on precision tracks — no outward projection into the room or outside.

Thermal performance

Thermally broken frame with argon-filled glazing for excellent energy efficiency.

Secure locking

Multi-point locking with anti-lift security as standard on all sashes.

Bespoke sizing

Designed to your exact opening dimensions — any width or height within system limits.

In situ

Sliding windows in different environments

Aluminium sliding window on an apartment building exterior
Sliding window in a modern bedroom interior with view
Contemporary glazing on a commercial office facade

Product overview

Wide-format sliding windows with slim thermally broken profiles

Aluminium horizontal sliding windows use a smooth-running track system to slide panels left or right, making them ideal for wide openings, low-level installations and locations where outward-opening windows are not practical. The thermally broken 70mm profile system delivers slim sightlines and excellent thermal performance.

The polyamide thermal break reduces cold bridging and condensation risk. Argon-filled double or triple glazed units achieve U-values as low as 0.7 W/m²K. Available in 2, 3 or 4 panel configurations with fixed or sliding lights in any combination.

All frames are finished in T5 powder coat in any RAL colour. Secure multi-point locking with anti-lift protection on all sliding panels. CE marked to EN 14351-1. Supplied bespoke to your exact dimensions with an 8–10 week lead time across London, Essex and the South East.

2-light3-lightNo projectionBalconyWalkwayApartment

Technical Specifications

System typeHorizontal sliding
Frame depth195mm system
Thermal break34mm polyamide
U-value (DGU)1.2 W/m²K
U-value (TGU)0.7 W/m²K
Max sash widthUp to 1500mm per sash
Max frame heightUp to 2400mm
Configuration2-light, 3-light
Standard coloursMetal grey, Black crystal, Coffee, Enamel white
Custom coloursAny RAL colour available
CE markingEN 14351-1 compliant
Lead time8–10 weeks

Typical applications

Residential new build
Apartment blocks
Commercial offices
Low-level installations
Wide-format openings
Refurbishment projects

Aluminium sliding window FAQs

What is the difference between a sliding window and a casement window?

A sliding window moves horizontally on a track, making it ideal for wide openings or locations where an outward-opening casement isn't practical. A casement window is side-hung and opens outward or inward on a friction stay.

Are aluminium sliding windows secure?

Yes. Our aluminium sliding windows feature multi-point locking with anti-lift protection on all sliding panels, meeting current building regulation security requirements.

Can aluminium sliding windows be triple glazed?

Yes. Both DGU (1.2 W/m²K) and TGU (0.7 W/m²K) options are available across our sliding window range.

What lead time should I allow for aluminium sliding windows?

8–10 weeks from order confirmation. CAD design drawings are provided for approval before manufacture.

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