12 / 09 / 2025
Every installation is a balancing act between what customers want, what regulations demand, and what keeps margins healthy. Aluminium casement windows with slimline double glazing tick all three boxes and give installers a product that changes the game.
A shift in homeowner priorities
uPVC windows remain a strong choice for many projects, but more customers are now looking for something that goes beyond the familiar. Aluminium casements with minimal sightlines have become synonymous with contemporary design, while still sitting comfortably alongside traditional styles. For installers, that creates an opportunity to offer homeowners a choice: the trusted reliability of uPVC or the architectural finish of aluminium, positioning yourself as solution-driven rather than product-driven.
The upsell economy
Margins are tighter than ever, but homeowners are still willing to pay more for products that feel bespoke. Aluminium casement windows are an easy step up from standard uPVC, and with Framexpress, you’re not just offering a different look, you’re offering a higher spec as standard. Slimline frames, increased thermal efficiency, and premium finishes set our system apart before you even start talking about colours, hardware or configurations.
That makes every installation a chance to upsell without overselling. Customers feel they’re choosing something unique rather than settling for an off-the-shelf option, and you benefit from higher order values without adding extra work to your schedule. It’s a straightforward way to protect margins while delivering the premium finish today’s market demands.
Market momentum for energy efficient windows
Aluminium now accounts for around 30% of the UK windows and doors market by value, with more than 65% of installers offering it as standard, according to the latest WindowBASE & Tommy Trinder Window and Door Market Trends 2025 report. Once considered niche, aluminium has firmly moved into the mainstream, driven by demand for slim profiles, colour choice and sustainability.
At the same time, research from Skipton Building Society shows that nearly half of UK homeowners now see eco-friendly renovations as a modern status symbol, proof that sustainability isn’t just an environmental choice, it’s a lifestyle one.
For installers, this translates directly into opportunity. Slimline aluminium casement windows sit right at the intersection of design, performance, and sustainability, making them a natural choice for homeowners who want their projects to look contemporary and feel future-ready. By offering them as part of your portfolio, you’re not just responding to customer demand, you’re putting yourself in a stronger position to win higher-value projects and attract clients who are willing to invest more in quality.
Confidence in supply
Behind all of this, reliable supply is what keeps projects on track. Aluminium casement windows with slimline double glazing might be what wins the order, but dependable manufacturing and delivery are what keep the job profitable.
With every Framexpress order manufactured in the UK, you get precision fabrication, consistent quality, and shorter lead times that keep your schedule moving. Our On Time, In Full Delivery promise means exactly that – products arrive when you expect them, in the specification you quoted. That reliability makes it easier to plan labour, avoid costly delays, and keep customers happy.
It’s not just about delivery either. Our technical support team is on hand to help with specifications, compliance questions and installation advice, so you can take on projects with confidence and focus on completing jobs efficiently.
Ready to grow your aluminium offering?
Talk to our expert team today on 01952 581100 or learn more about our Ali by Framexpress range and discover how we can help you win more projects, boost margins, and stay ahead of the curve.