For years, UPVC dominated the UK replacement window market. But over the last decade, aluminium windows have experienced a significant revival — and it's not hard to see why. Advances in thermal break technology have eliminated the old weakness of aluminium (poor insulation), while the material's natural strength allows for far slimmer frames and larger glass panels than UPVC.
Ultra-Slim Sightlines
Aluminium's strength-to-weight ratio means frames can be made significantly slimmer than UPVC equivalents. This maximises the glass area, floods rooms with natural light, and gives a clean, contemporary look that's particularly popular in modern extensions, orangeries, and new builds.
Thermally Broken for Modern Standards
Modern aluminium windows use a thermal break — a non-conductive barrier within the frame that prevents cold from transferring from outside to inside. Our Cortizo aluminium range achieves a U-value of 1.1 W/m²K, comfortably exceeding UK building regulations, and can accommodate glazing up to 44mm thick for maximum thermal and acoustic performance.
Outstanding Acoustic Performance
If you live near a busy road, railway, or in an urban environment, aluminium windows with specialist acoustic glazing can reduce noise transmission by up to 45 decibels. That's the difference between hearing every car that passes and barely noticing traffic at all.
Any Colour You Like
Unlike UPVC, aluminium is powder coated rather than foil wrapped — meaning it can be specified in any RAL colour, with dual-colour options (different inside and out), anodised finishes, and even wood-effect coatings. Whether you want a classic heritage look or a bold architectural statement, aluminium delivers.
Durability & Low Maintenance
Aluminium is naturally resistant to rust and corrosion. The powder coat finish is extremely durable and won't fade, peel, or crack. Unlike timber, it requires no painting — just an occasional wipe-down to keep it looking its best.
Is Aluminium Right for You?
Aluminium tends to be the premium choice — suited to larger openings, contemporary properties, and homeowners who want the very best in aesthetics and performance. For most standard replacements, UPVC remains excellent value. The best way to decide is to see both options side by side.
Book a free home survey and our team will walk you through all the options for your property.