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 available
Frame
30 Finishes
Hardware
6 Finishes
Warranty
10 Year
Classic Outward-Opening Design
The Apex Period style 2500 casement features sharp yet understated styling with A+ energy rating. Triple glazed options available. 100% recyclable with 10-year product guarantee.
Engineered for everyday excellence.
Made to measure in the UK. Timeless design, serious engineering inside — and four good reasons it's still Britain's most-fitted window.
Super efficient
Multi-chamber thermal breaks and warm-edge spacers, A+ rated as standard. Lower bills, every year of ownership.
Built for any home
The profile reads clean in a Victorian terrace, a country cottage, or a new build — outward sashes sit proud for sharp sightlines.
Sound-proof
Tightly sealed sashes and internally beaded glazing cut external noise. Triple-glazing pushes acoustic performance further still.
Safe & secure
Steel-reinforced sashes and PAS 24 multi-point Yale locking. Engineered to resist the methods burglars actually use.
Specifications
1.2
U-Value (W/m²K)
Excellent thermal efficiency to help reduce energy bills.
PAS 24 available
Security
PAS 24 security available 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 product guarantee.
30+
Colours
A wide choice of colours to suit every style.
Technical
Built for performance
Outward-opening sash on a 70mm profile, standing proud of the frame for traditional sightlines. Multi-point locking as standard. Compatible with 28mm double or 36mm triple glazed units. 100% recyclable PVC‑U with a 10-year product 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
20 colourways held in stock, with 30 available across the woodgrain collection. Smooth, grained, and woodgrain foils that never need repainting, with dual-colour options for a different finish inside and out. All finishes carry the same 10-year guarantee.
Make it yours.
Selected colour · Agate Grey
How long does installation take?
Agree the survey, installation and any approval timetable with the team for your project.
Is the installation FENSA-registered, and do I get the certificate?
Yes. Apex Glazing is FENSA-registered (Reg 40373). For eligible replacement windows and doors you receive a FENSA certificate when the job is done. It confirms the work complies with Building Regulations and is registered with your local council. FENSA does not cover new builds, new extensions, conservatories or porches.
What warranty do I get?
A 10-year guarantee on the product and a 10-year guarantee on the installation, with an insurance-backed warranty. Your guarantee certificate comes with the completion email.
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.
