Vertical sliding units are the perfect choice to install inside draughty timber sliding sash windows for insulation and noise reduction. Balanced springs hold the window in any position.

• Various sizes available

• Standard colour is white with upgrades available to coloured frames - please ask for a quote

• How much is secondary glazing? Find out by using our online estimating package (costings include installation) - all prices are subject to survey

• For secondary glazed window sizes which are not available on line please ring for help

• Surveys available in Bedfordshire, Cambridgeshire, Buckinghamshire, Northamptonshire, Hertfordshire and selected areas of London