uPVC vs Aluminium Windows: Which Should You Choose?

The choice between uPVC and aluminium windows divides London homeowners more than almost any other glazing decision. Both are excellent products — but they suit different properties, different budgets, and different aesthetic ambitions. Here is a straightforward comparison.

What This Guide Covers

• Aluminium costs 40–60% more than uPVC but lasts twice as long (50+ years vs 25)
• Aluminium offers slimmer sightlines — up to 40% more glass area per window
• uPVC has better thermal performance out of the box; aluminium needs thermal breaks
• Aluminium is the dominant choice in West and Central London's premium properties
• uPVC offers better value in less affluent areas and rental properties

Introduction

London homeowners face unique challenges when it comes to glazing — from period properties with sash windows in conservation areas, to modern developments requiring structural glass installations. Getting the right advice before you commit can save you significant time and money.

At BuilderFix Glazing, we have completed thousands of glazing jobs across Greater London and Surrey — from emergency repairs in Kensington and Chelsea, to bespoke walk-on glass installations in Mayfair and Belgravia. This guide is based on real experience and the questions our customers ask us most often.

Photos From the Job

What Does This Typically Cost in London?

Costs vary depending on the type and size of work, the glass specification, frame material, and access. As a general guide, always obtain a free written quote before committing — this protects you from unexpected charges.

At BuilderFix Glazing, we provide free, no-obligation written quotes for all work. Our prices are transparent and fixed before we start — no surprises on the invoice.

What to Ask When Getting a Quote

• Is the price fixed, or could it change once work starts?
• What glass specification is included?
• Are all fixings, sealants and finishing included?
• What compliance documentation will I receive?
• What happens if there is an issue after completion?