Established over 35 years ago, John Williams is one of the largest home improvement companies in North Wales and the North West of England.

We are specialists in the design manufacture and installation of high quality double glazed products. Including Windows, Doors and Conservatories.

We not only aim to provide top quality products and service, but safety and security are very important features we incorporate into our designs.

Sash Window security features: All our Sash windows are supplied with a purpose-built shoot bolt, 4 point locking mechanism with key locking handles. All glazing is internal so no worries there, the units cannot be removed from outside. High security friction stays keep the Sash windows in the position you choose, so you can select the degree of ventilation you want, without fuss.