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Timber sash windows have been part of London’s architectural identity for centuries. From Georgian townhouses in Westminster to Victorian terraces in Ealing and Edwardian homes in North London, traditional sash windows continue to be one of the most desirable window styles. Today, modern manufacturing techniques allow homeowners to enjoy the timeless appearance of timber while benefiting from significantly improved thermal performance, security and durability.

At International Windows Group, we manufacture and install bespoke timber sash windows across Greater London. Every window is made to measure, ensuring a perfect fit for your property while maintaining its original character.

Why Choose Timber Sash Windows?

Unlike standard off-the-shelf windows, bespoke timber sash windows are designed specifically for your property. This allows us to preserve original architectural proportions while improving insulation and security.

Whether you own a period property or a modern home, timber remains one of the most attractive and durable window materials available.

Made to Measure for Every Property

Every project begins with a detailed consultation followed by precise measurement. This ensures every window fits perfectly while complementing the architecture of your home.

Learn more about our Timber Sash Windows and our complete range of Timber Windows in London.

Energy Efficiency That Makes a Difference

Modern timber sash windows offer dramatically improved insulation compared with older single-glazed units. Combined with high-performance double or triple glazing, they help reduce heat loss, improve comfort and lower energy bills throughout the year.

If you’re unsure which glazing option is right for your property, read our guide:

Double vs Triple Glazing in London.

Living on a Busy London Road?

Noise pollution is becoming an increasing concern across London. Modern acoustic glazing can significantly reduce traffic, rail and aircraft noise while maintaining the traditional appearance of timber sash windows.

Read more in our guide:

Acoustic Glazing for London Properties.

Victorian and Heritage Homes

Many London properties fall within conservation areas or are listed buildings. In these cases, replacement windows often need to replicate original glazing bars, mouldings and opening mechanisms.

Our bespoke manufacturing process allows us to recreate traditional designs while incorporating modern weather seals, security systems and energy-efficient glazing.

You may also find these guides useful:

How Much Do Timber Sash Windows Cost?

The cost depends on the size of the window, glazing specification, timber species, ironmongery and finish. Because every window is manufactured individually, pricing varies between projects.

For a detailed breakdown, visit:

How Much Do Timber Sash Windows Cost in London?

You can also use our free Sash Windows Cost Calculator for an instant estimate.

Professional Installation

High-quality windows deserve professional installation. Our experienced fitting teams ensure every installation is completed to the highest standard, delivering long-term performance, smooth operation and excellent weather resistance.

From consultation and measurement through to manufacturing and installation, every stage is managed by our own experienced team.

Why Choose International Windows Group?

Start Your Project Today

If you’re planning to replace your timber sash windows, choosing an experienced manufacturer makes all the difference. International Windows Group has helped homeowners throughout Greater London improve comfort, energy efficiency and the appearance of their homes with bespoke timber windows built to last.

Explore our Sash Windows London service, browse our portfolio, or contact us today for a free consultation.