Aluminium vs uPVC Windows: Which Is Best for London Homes in 2026?

If you're planning a window replacement in London this year, you've probably already come across the same question everyone asks: aluminium or uPVC? Both are excellent choices, but they suit different types of homes, budgets, and priorities. Here's a straightforward breakdown to help you decide.

The Short Answer

Aluminium windows offer slimmer frames, a more contemporary look, and greater strength, making them ideal for larger glazed areas, extensions, and period properties being modernised. uPVC windows are more budget-friendly, low-maintenance, and offer strong thermal performance, making them a popular choice for standard residential replacements across London and Essex.

Cost

uPVC is generally the more affordable option upfront, which is why it remains the most common choice for homeowners replacing windows across a whole property. Aluminium sits at a higher price point due to the material and manufacturing process, but it often pays back through durability and longevity — aluminium frames can comfortably outlast uPVC by decades with minimal upkeep.

Style and Sightlines

This is where aluminium tends to win for homeowners after a modern look. Aluminium frames are significantly slimmer than uPVC, meaning more glass and less frame — ideal for open-plan extensions, bifold doors, and contemporary renovations common across London boroughs. uPVC frames are bulkier by comparison, though modern uPVC profiles have narrowed considerably in recent years.

Durability and Maintenance

Aluminium doesn't warp, expand, or discolour over time the way uPVC can, particularly in direct sun. It's also naturally resistant to corrosion when properly treated, making it a strong option for London's mixed weather. uPVC requires very little maintenance too — an occasional wipe down keeps it looking good — but it doesn't have quite the same lifespan as aluminium.

Thermal Performance

Both materials can achieve excellent energy efficiency when paired with the right glazing. uPVC has naturally lower thermal conductivity than aluminium, but modern aluminium systems use thermal breaks within the frame to close that gap almost entirely. In practice, both can meet or exceed current building regulations for London homes when specified correctly.

Which Should You Choose?

• Choose uPVC if you want the most cost-effective option with strong performance and low maintenance for a full-house window replacement.

• Choose aluminium if you want a sleek, modern finish, larger glass panels, or you're renovating a period property with a contemporary extension.

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Get Expert Advice for Your London Property

Every property is different, and the right choice often comes down to your home's age, style, and budget. Our team has been manufacturing and installing windows and doors across London and Essex since 2007, and we're happy to talk through your options.

Book a free design consultation today — call 020 8550 2929 or [request a callback here].