Roof Lanterns: The Complete Buying and Installation Guide

A well-specified roof lantern is one of the most dramatic improvements you can make to a single-storey kitchen extension — adding natural light, ceiling height, and architectural character that an opaque roof simply cannot provide. Here is how to choose the right one.

What This Guide Covers

• Aluminium roof lanterns: the dominant choice — slim sightlines, 40+ year lifespan, any RAL colour
• Self-cleaning glass: adds £150–£300 but eliminates maintenance on hard-to-reach lanterns
• Thermal performance: look for a Uw value below 1.5 W/m²K for Building Regulations compliance
• Internal blind systems: can be fitted within the sealed unit — eliminates external mechanism
• Most popular sizes for London kitchen extensions: 1.5m×2m to 3m×4m

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?