
Sash Window Replacements
Custom-built sash window replacements in Islington and across London
Window replacements and new installations completed with precision and care. Work with Sash Window Repairs to upgrade your property. From our base in Islington, we work across North, East and West London.
Request your free installation quote today.
Perfect replicas
FENSA registered
Parts & labour guaranteed
The design and installation of replacement sash windows
Whilst we'll always look to repair or restore your windows in the first instance, there may be situations where a full replacement is the most viable option. Opting for a new installation is usually the ideal solution for windows that have suffered extensive damage, rot, or wear, making repairs ineffective and the maintenance and upkeep requirements extensive. With our custom-built replacements, you’ll enjoy the classic aesthetic of sash windows along with modern performance benefits like improved insulation, energy efficiency, and enhanced security.
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We appreciate that you may not know which is the best approach to take for your property, which is why our specialists offer transparent, expertise-led recommendations. Backed with our knowledge, you can make the right decision for your property and your budget. Simply call us to find out more. ​

The benefits of a sash window replacement
Replacing your sash windows offers numerous benefits, from improved energy efficiency and enhanced security to reduced maintenance and increased property value. Modern sash window replacements maintain the timeless charm of your property while incorporating advanced materials and technology for better insulation and durability. Whether you're updating for aesthetics or functionality, our bespoke replacements ensure a seamless blend of traditional style and modern performance.
Enhanced energy efficiency
Our replacement sash windows feature modern draught-proofing and insulation, helping to reduce energy bills and create a more comfortable indoor environment.
Improved security
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Fitted with advanced locking systems, for superior security and added peace of mind.
Customisable designs
Offering a variety of materials, finishes, and glazing options, allowing us to match the style of your original windows or to create a fresh new look.

A new lease of life for single glazed windows
Traditional single glazed units could be costing you more than you realise, and though the cost of a new installation may be off-putting, you'll soon see the return of your investment once the cold weather sets in. Our hardwood, double-glazed sash windows offer an additional thermal barrier, combined with draught proofing, to better insulate and protect your home. With these properties, you could see a huge reduction in your energy bills without compromising comfort.
The perfect balance between style and functionality
Many clients across London are drawn to the aesthetic appeal of sash windows, and we use high-quality timber, glass and operational components to ensure each sash window showcases the latest advancements in window technology. Combined with our precise fit installations, paying close attention to detail and function, you'll have a new feature that blends seamlessly with your home.

See what our happy clients are saying
Very happy with the work done by Joe. Quick, efficient, polite and very good value for the quality of the work. Thank you!
Tim W.
Yell Review
We recently had our sash windows replaced and couldn’t be happier with the results! Archie and Matty were fantastic—so friendly, helpful, and incredibly efficient. They made the whole process smooth and stress-free, and the quality of their work speaks for itself. We highly recommend them for any window work or similar projects. Thanks again, Archie and Matty!
R Pro.
Google Review
Our 5-star ratings reflect the care and expertise we bring to every project. Discover why so many homeowners trust us with their sash windows.
Your New, Advanced Sash Windows Await
Simply call our team in Islington to learn more about costs, manufacturing and our expert new sash window replacement service.