How Long Does Double Glazing Last?

The lifespan of double glazing varies significantly by frame material, glass specification, and installation quality. Here are realistic figures — and the signs that tell you whether your existing windows are worth keeping or due for replacement.

What This Guide Covers

• uPVC double glazing: 20–25 years for the frame; sealed units may fail at 15–20 years
• Aluminium double glazing: 40–60 years for the frame; sealed units as above
• Timber double glazing: 30–40 years with proper maintenance; can last longer with refurbishment
• Sealed unit failure (misting) is not frame failure — units can be replaced without new frames
• Quality of original installation matters as much as material — poor fitting shortens lifespan significantly

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.

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?