What Happens When You Get New Windows? The Installation Process

Many homeowners are surprised by how fast a professional window replacement actually is. Understanding the process in advance helps you prepare your home and make informed decisions at each stage. Here is exactly what happens from first contact to completion.

What This Guide Covers

• Stage 1: Site survey — accurate measurements and planning assessment (usually free)
• Stage 2: Written quote — fixed price agreed before any commitment
• Stage 3: Manufacturing — typically 2–4 weeks for bespoke sizes
• Stage 4: Installation — most windows replaced in a single day per room
• Stage 5: FENSA certificate issued within 30 days of completion

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?