Casement Window.
Crisp sightlines, A+ thermal performance, and a 14-colour palette. Britain's most-fitted window, manufactured here in the UK to your exact opening.
Casement Window
uPVC Window System
Glazing
Double / Triple
Energy
A+ Rated
Security
PAS 24
Frame
14 Finishes
Hardware
6 Finishes
Warranty
10 Year
Classic Outward-Opening Design
The Deceuninck 2500 Heritage Chamfered casement features sharp yet understated styling with A+ energy rating. Triple glazed options available. 100% recyclable with 10-year manufacturer guarantee.
Specifications
1.2
U-Value (W/m²K)
Excellent thermal efficiency to help reduce energy bills.
PAS 24
Security
Tested to PAS 24:2016 for enhanced protection and peace of mind.
A+
Energy Rating
Top energy rating for maximum performance and sustainability.
Double / Triple
Glazing
Double or triple glazing options for comfort and quiet.
Multi-point
Locking
Advanced multi-point locking for superior security.
100%
Recyclable uPVC
Sustainable by design. 100% recyclable uPVC.
10 Years
Guarantee
Backed by our 10-year manufacturing guarantee.
30+
Colours
A wide choice of colours to suit every style.
Technical
Built for performance
Outward-opening sash with chamfered profile. Multi-point locking as standard. Compatible with 28mm double or 36mm triple glazed units. 100% recyclable PVC‑U. 10‑year manufacturer guarantee.
Configurations
Flexible design options
Side-hung, top-hung, or fixed options. Available as single or multi-light configurations with Georgian or astragal bar options.
Finishes
Made to match your space
Standard colours: Black (RAL 9005), Anthracite Grey (RAL 7016), and White (RAL 9016). Bespoke finishes available on request, including textured, matte, satin, and dual-colour (different inside vs outside) options. Powder-coated to BS EN 12206-1 with 25-year colour-stability guarantee.
Downloads coming soon.
Make it yours.
Selected colour · Agate Grey
How long does installation take?
Most window installs are completed in 1-2 days. Doors typically take 1-3 days depending on threshold work. Full-house or multi-room replacements run 3-7 days. We give you a precise schedule at the survey stage so you can plan around it, no open-ended jobs.
Is the installation FENSA-registered, and do I get the certificate?
Yes. Apex Glazing is FENSA-registered (Reg 40373). On completion you receive a FENSA certificate, which satisfies Building Regulations Part L compliance and removes the need for separate council approval. Certificates are issued within 30 days and stored in your FENSA online account for future house sales.
What warranty do I get?
10-year manufacturer warranty on the product itself (frame, glass seal, hardware) plus a 12-month workmanship guarantee from us on the installation. We've been trading since 2005 with 6,340 completed projects and a 5.0-star Google rating, we'll come back if anything's not right.
Do you remove and dispose of the old windows or doors?
Yes, removal of existing units, safe disposal at a licensed waste facility, making good of internal and external reveals, and a thorough final clean-up are all included in the quoted price. There are no extras for skip hire, scaffolding, or waste removal.
Can you match existing windows for a phased replacement?
Yes. We can RAL colour-match the new frames to your existing units, replicate sightlines, glazing bar layouts, and hardware style to keep a phased replacement consistent. Bring photos to the survey, or we'll come and measure the existing windows so the new ones blend in seamlessly when fitted alongside.
