Sash Window Draught Proofing: A Guide for London Homeowners

Sash window draught proofing is one of the most cost-effective home improvements available to London homeowners with period properties. It reduces heat loss by up to 86% through the window, costs a fraction of replacement, and preserves original windows that add value to the property.

What This Guide Covers

• Sash window draught proofing cost: £150–£300 per window installed
• Reduces draughts and heat loss by up to 86% through the sash gaps
• Brush pile pile seals fitted to all four edges of each sash — virtually invisible
• Does not change the external appearance — important for conservation areas
• Can be combined with slim double-glazed unit replacement for maximum performance

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?