Sash Windows Kingston upon Thames

Optim sash windows specialise in manufacturing the highest quality timber sash windows and doors, without compromise. To this end we source only the best quality materials in everything we make. All our timber is FSC or PEFC certified (sustainably, responsibly procured from managed, renewable sources, with full chain of custody certification) and only superior durable timber is incorporated in all exposed and exterior elements.

Our original box sash window improved and enhanced over 40 years, suitable for most property styles, with traditionally profiled sashes hung in a 155mm box, with 16mm Argon glazing cavity, Soft coat low E glass and Warm-edge spacer bar. Offered in a choice of house colours, with a range of sash horn profiles, glazing styles, hardware, architraves and decorative mouldings.

Our original box sash window as described above, but a thinner box depth of 140mm and narrow profile ‘slim-seal’ Krypton filled glazing gives an even more ‘period’ appearance. In addition, the glazing cavity is slimmed down from 16mm to either 8, 6 or 4mm depending on requirements, with options for antique heritage glass. These windows may also be single glazed. This window is suitable for conservation areas, heritage work and listed buildings.

For applications demanding a greater degree of individuality we offer our bespoke range. You may choose from a wide range of timber profiles including sash horns, architraves and other feature mouldings that you wish to incorporate in order to retain or restore the original character of your period windows. If we do not hold an appropriate profile in our extensive catalogue of tooling, we will replicate your existing profiles as required. In addition, a wide variety of glazing configurations, tailored colour matching, and individual fittings colours matched to your own tastes are also available.