28 / 08 / 2025
Some products come and go with trends, while others earn their place as a permanent fixture in the trade.
For window installers, the uPVC casement window is exactly that. From straightforward replacements to high-spec refurbishments and new builds, casements remain the most installed and most requested style in the UK.
But why do they continue to dominate? It comes down to a unique combination of versatility, performance and reliability, features that make them as relevant today as they were when uPVC first became the trade’s go-to material.
A design classic that adapts
When most people picture a window, they picture a casement. Side-hung or top-hung, outward opening, with clean, simple lines. The design is universal.
That familiarity works in the installer’s favour. Homeowners rarely need to be convinced of what a casement is or why it works. Instead, the conversation can move straight to finishes, performance and budget.
And the design adapts, from standard casements suited to price-driven replacements, to uPVC flush casement windows perfectly suited for heritage projects and premium refurbishments, the same core style fits across every type of job. That’s why casements have never gone out of style, they evolve, but they don’t disappear.
Performance is what keeps casements truly futureproof. With Part L Building Regulations tightening, every window installation must hit thermal efficiency targets.
Thermal performance that keeps them future-ready
Modern uPVC casements are designed with multi-chambered profiles, advanced seals, and high-performance double or triple glazing to deliver strong insulation. The result? Energy efficient uPVC windows that keep homes warmer in winter, cooler in summer, and compliant with the latest regulations.
For installers, that means you can fit with confidence, knowing every unit is already built to meet or exceed performance expectations. For homeowners, it means reduced reliance on heating and lighting, and the long-term reassurance that their windows are future-ready.
Security that’s easy to stand behind
Security remains one of the strongest selling points for windows, and casements deliver it as standard.
Key features include:
- Multi-point locking systems for robust closure
- Reinforced frames that add strength where it counts
- PAS 24 accreditation for proven, tested protection
From a sales perspective, being able to confidently state that security is built in as standard makes conversations simpler. Homeowners get the assurance they’re looking for, and installers avoid having to bolt on extras just to meet expectations.
A safe bet for installers
Not every window style is as easy to sell as it is to install – uPVC casement windows are. They’re straightforward to quote because customers understand them. They’re straightforward to install thanks to precision fabrication and consistent sizing. And with UK-made frames supported by On Time, In Full delivery, they arrive when you need them, complete and ready to fit.
For installers, that combination makes casements the safest bet in the trade. They’re the product you know you can rely on to sell, to fit, and to perform.
Choice that opens up opportunity
Today’s systems are more versatile than ever, with a full suite of colour foils and dual-colour options to meet design briefs. Add hardware and glazing flexibility into the mix, and you’ve got a product that works from the most cost-conscious replacement to the most design-led extension.
Flush casement windows are the perfect example. The same core style, but with a cleaner finish and slimmer sightlines, opens up opportunities in premium residential projects where style matters as much as performance.
This adaptability is what keeps casements ahead. They’re not just popular, they’re profitable, because they let installers compete across every segment of the market.
Durability that stands the test of time
British weather is tough on every part of a home. From coastal winds to winter frosts, windows need to withstand it all.
Double glazed uPVC windows are tested to British Standards for weather performance, with seals, profiles and glazing designed to perform long-term. That means:
- Draughts and leaks kept firmly out
- Less risk of callbacks for installers
- Homeowners reassured that their investment is built to last
It’s this proven durability, paired with low maintenance, that keeps casements at the top of the recommendation list.
Why casement windows remain the trade’s best-seller
When you put it all together, timeless design, built-in thermal efficiency, trusted security, installer-friendly fitting, wide-ranging choice and proven durability, it’s no surprise casements remain the UK’s best-selling window style. They’re not a passing trend, they’re a product that works across cost-conscious jobs, premium projects, and everything in between.
Talk to our team today on 01952 581100 or get in touch with our expert team to explore our full range of trade uPVC windows and doors.