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Windmill Windows traditional sliding sash window is designed to offer customers the potential to perfectly match the existing timber product in their home. Offering the Spectus system to the Oxford, Thame and Bicester areas, we have in our opinion the best uPVC Box Sash system on the market.

Taking all the finest points of the traditional design, Windmill Windows uPVC version matches the aesthetic appeal while offering superior performance and maintenance benefits. Weights and pulleys are replaced by sophisticated spring and spiral balances, and a unique tilt facility enables cleaning of sashes safely from the inside.

With the traditional furniture, options of decorative or run through horns and choice of a wood grain finish, our vertical sliding sash windows offers both elegance and traditional design in one whilst providing the additional benefits of uPVC thermal performance and low maintenance.


  • Box-Sash-Technical
  • Central lock on a uPVC Box Sash Window
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    Sash lift on a uPVC Box Sash window
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    Shark Fin Restrictor
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    Ring pull on a uPVC box sash window
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    Central Lock Sash Lift Shark Fin Restrictor Ring Pull

  • We offer both smooth and wood grain finishes. The standard smooth finish is white but we do have the option to spray to match any RAL colour choice that you wish. There is a wide range of woodgrain colours available as shown below but please call the office or visit to enquire further.

    Sliding Sash Colours