Sash Solutions are true experts. They identified the best solution for our old sash windows - which in our case meant replacing the old single-glaze sashes with new double-glazed sashes made from Accoya, while retaining the original box frames. The new windows are beautifully made, the installation was completed within one day, and Sean and his team are a pleasure to work with. This quality of work does not come cheap, but it was worth it.