About Us

About Us


Traditional timber sash windows are an essential feature of a period building’s character. It is, therefore, vital to retain them; not only because of the aesthetic appeal but also because sash windows make your property much more valuable financially.

Maintaining the traditional features of your timber sash windows used to mean compromising on comfort. But not with Ventrolla! Our unique sash window renovation and performance upgrade service makes problems associated with old sash windows, such as draughts, rattles, rot and operational issues, a thing of the past, allowing you to enjoy your traditional wooden sash windows, regardless of the weather outside, and reduce your energy costs at the same time!

Renovating your timber sash or casement windows requires considerably less money and resources than replacing them with new ones. This minimises your costs and the harmful impact on the environment, making the process of your sash windows’ restoration mutually beneficial for everyone involved.


Ventrolla was founded in 1983 by Robert Tunnicliffe who previously worked at Ford Motors developing specialised high performance gaskets and seals. The name ‘Ventrolla’ is a slightly warped portmanteau of ‘Ventilation Control’.

Robert turned his hand to draught proofing sash windows after his wife noticed it becoming increasingly difficult to keep their home warm during the colder months and so Bob, using his expertise at Ford developed the first perimeter sealing system and installed it himself.

Immediately the draughts, rattles and dust ingress were banished! After the initial success of the hand-made prototype Bob went on to found Ventrolla and patented both the perimeter sealing system and the sash removal system, both of which, 30 years on are still core products in the Ventrolla service and make our offering unique.

In 1986 the Ventrolla Perimeter Sealing System was awarded the prestigious Design Council Award.

Our first branch opened in the beautiful North Yorkshire British town of Harrogate and now over 30 years and 50,000 sash windows later we operate internationally and have established ourselves as the market leader in the repair, restoration and replacement of wooden sash windows.


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