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Sash Window Restoration

Welcome to Fortis & Hooke, the UK’s premier sash window restoration company. If you’re searching for sash window repair and restoration services then you’ve come to the right place. From wooden door restoration to sash window draught proofing, rest assured our team of dedicated specialists have got it covered.

Our unique and time-tested approach is cost effective, environment friendly and comes complete with an ironclad 10-year guarantee. Put us to the test and book your free survey now to find out why we’re regarded as the best sash window company in London and the South East.

Our Services

Sash Window Restoration

Our full restoration service combines repair, repainting and renovation to give you the best results. Your sash windows will be fully restored and draught-proofed without any disruption to your property.

Sash Window Repair

Whether it’s minor damage or extensive decay fear not because we can help. Fortis & Hooke’s expert carpenters, joiners and glazers combine modern techniques and long-established know-how to tackle even the most complex repairs.

Replacement Sash Windows

If your windows are beyond repair, our specialist joiners can produce bespoke hardwood replacements. Produced to your exact requirements, our replacement sash windows can even be fitted to the existing frames, removing the need for drawn-out planning procedures.

Sash Window Draught Proofing

The tried and tested Fortis Perimeter Sealing System ensures your windows are fully draught-proofed without damaging their appearance. Draughts, rattles and external noise are eliminated, giving you better insulation and improved energy efficiency.

Sash Window Painting

Our skilled painters can give your sash windows the protection they need, by carefully hand-stripping and hand-painting the original timber frames with the highest quality materials. We ensure your windows have optimal protection for years to come.

Glass Replacement

The expert glazers at Fortis & Hooke are experienced in all kinds of glass replacement. We can install single, double or specially functioning glass to original frames, giving you the beauty of heritage windows with the benefits of modern glazing technology.

Wooden Door Restoration

Our bespoke wooden door restoration service covers all aspects of wooden door repair. Your doors will be given a completely new lease of life with repairs and repainting, leaving them looking beautiful and functioning perfectly long into the future.

French Door Restoration

Fortis & Hooke’s French Door Restoration service offers a cost-efficient alternative to needless French door replacements. Whether it’s general wear and tear, unsightly wood decay or simply repainting, we will do everything required to restore your doors’ functionality and appearance.

French Window Restoration

If your French windows have become damaged or simply look neglected, we can help. Our team of wooden window specialists cover everything from repairs and repainting to glass replacement to ensure your French windows are function perfectly and look flawless.

Our Approach

Fortis & Hooke was established in 2010 with one goal in mind- to provide a long-lasting alternative to needless period window and door replacements. Over the years, we’ve transformed thousands of sash windows and French doors- there really isn’t much our restoration specialists can’t do. For every project, either big or small, these are the steps we take:

Free Survey

Get in touch and you will receive a comprehensive survey and detailed quotation upfront. It’s 100% free and there is no obligation to continue. Everything is included, helping you make an informed decision.

Offsite Service

We won’t turn your property into a worksite. At Fortis & Hooke, we remove the sash windows sympathetically and work on them offsite in our workshop. It’s quicker, cleaner, less disruptive to you and delivers better results.


Expect fully repaired windows in keeping with the heritage of your property. Say goodbye to rot or cracked glass panels. Zero draughts and peeling paint. Just a snug and comfortable property for years to come.

Our Customers

Join the growing list of Fortis & Hooke customers and we guarantee that you’ll be in good company. Our window and door restoration specialists have worked in partnership with some of the world’s best-known brands and we’ve completed work on some of the most iconic properties in London and the south-east of England. But don’t take our word for it, find out what our valued customers have to say!


Are sash windows energy efficient

If your property is fitted with sash windows, you might be wondering whether they are energy efficient. Doors and windows are an essential part of any building’s insulation. You need them to keep heat inside and cold outside, and ensure your energy bills are as low as possible. So how do sash windows fare when it comes to energy efficiency? Read More >

Your sash window era

Sash windows are named after their main feature – the sliding sash. While they all have this in common, they can differ in their size, colour and of course the era they’re from. With the first sash window installation dating back to the 17th century, they have been used in a number of historic periods. Read on to find out which era your sash windows are from. Read More >

Victorian Architecture in England

The Victorian period refers to the time when Queen Victoria ruled Britain. With the coming of railways and new manufacturing processes, locally produced building materials became available all over Britain. Hence houses in the local area were now built using the same building materials. Houses made of local stone, timber and straw were now replaced and built of bricks from other countries. Read More >

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