Sash Windows Expert is a reputation led manufacturer and installer of traditional timber windows and doors. We are based in Reading, Berkshire and our operational area includes London, the home counties and M4 Corridor.
We provide a complete window service, from draught sealing and double glazing conversions to the manufacture and installation of secondary double glazing, complete new windows and doors, including mechanical parts and accessories.
Our superb team of surveyors and installers ensure you are provided with a solution that fully meets your needs and we have a wealth of example properties and satisfied customers prepared to stand testimony to the commitment and expertise of our work.


We provide a mobile glazing and renovation service, specialising in converting single glazed windows and doors into sealed double glazed units. How it works. Ours is a simple and cost effective solution to draught proofing and double glazing. Our service represents a saving of up to 40% on the cost of full replacement windows and doors and is suitable in almost all circumstances with timber window frames, doors and sills.

We provide a FREE, no obligation survey and will let you know immediately the suitability of your windows and doors for ‘Expert’ treatment.

Your windows should be: Timber framed, free of rot (or economically repairable) and suitable depth to take a wider double glazed unit.