Exclusive W1200mm X H800mm Legacy Upvc Sliding Sash Windows Solution [co74Sk2A]

Legacy uPVC Sliding Sash Window

Enjoy the timeless charm of traditional sash windows with all the benefits of modern technology. The Legacy uPVC Sliding Sash Window combines elegant heritage aesthetics—like run-through sash horns, mechanical joints, and deep bottom rails—with the durability and low maintenance of uPVC. Perfect for period properties or new builds, these windows offer exceptional thermal performance, smooth slide-and-tilt functionality, and customizable style options without compromising on quality or character.

Technical Spec

• Size: W1200mm x H800mm
• Minimum Height Requirement: 800mm
• Material: Multi-chambered uPVC profile
• Trickle Vent: Yes
• Glass: 28mm Double Glazed, A rated, Argon Filled, Float, Black Spacer Bar 
• U-Value: 1.4W/m²K (Standard); 1.2W/m²K (Thermal Upgrade available)
• Cill Specification: 150mm
• Sightline (Midrail): 37mm Slim Midrail
• Frame Depth: 128mm (Front-to-back dimension)
• Ventilation: Colour-matched trickle vents available
• Slide & Tilt: Easy-clean tilt facility (Bottom sash standard; top sash subject to finish)
• Air Tightness: Class 4
• Water Tightness: Class 6A
• Wind Load: Class A3
• Security: Optional PAS 24 security upgrade available
• Astragal Bar: Not Included 

Guarantee

All upvc sash windows are supplied with a 10-year colourfast guarantee for peace of mind, covering material integrity and craftsmanship. 

Brochure & Downloads

Brochure:

Installation Guide:

FAQs

Q: What makes the Legacy sash window look authentic compared to real timber?
A: The Legacy sash window includes mechanical joints, run-through sash horns, a deep bottom rail, and slim 37mm midrails—all of which replicate traditional timber aesthetics with modern uPVC durability.

Q: Can these windows be used in conservation areas or listed buildings?
A: Yes. Legacy sash windows have been successfully approved for use in many conservation areas due to their authentic heritage styling and material options.

Q: What is the standard U-value of this window, and is an upgrade available?
A: The standard U-value is 1.4W/m²K. A thermal upgrade is available that brings the U-value down to 1.2W/m²K without the use of krypton gas or rare glass.

Q: Do the windows tilt for cleaning?
A: Yes, both sashes slide and the bottom sash includes a tilt facility as standard for easy cleaning. Top sash tilt is available depending on the finish chosen.

Q: What is the default cill size provided with this window?
A: This product is supplied with a 150mm cill as standard.

Q: Are custom colours and finishes available?
A: Absolutely. Choose from 17 woodgrain foils or opt for a bespoke bonded colour to perfectly match your property.

Q: Is PAS 24 security certification available for these windows?
A: Yes, an optional PAS 24 security upgrade is available, which includes enhanced locks, bolts, and reinforced components to meet new-build standards.

Q: What is the minimum window height for this product?
A: The minimum height is 800mm, which this product meets exactly.