Window Calculator Get an estimate on a sash window in just a few seconds. Enter your requirements below. Dimensions Enter the internal dimensions of your window frame, in millimetres. For example, for a window that's one metre wide by two metres tall, enter a width of 1000 and a height of 2000. Minimum dimensions: 200mm (20cm) width x 400mm (40cm) height. Width Height Glazing Choose the level of glazing you require. Single GlazeDouble Glaze Configuration Sash windows come in various pane configurations. Choose one from the list below. One over OneTwo over TwoSix over Six Opacity Do you want your window to be transparent (clear), or translucent (obscure)? ClearObscure Safety Do you require safety glass that has been toughened by tempering? Choose one option. StandardToughened Finish Choose what level of finish you require. Full factory finish includes primer and multiple coats of paint, with colour to your specifications. UnpaintedPrimer OnlyFull Factory Ironmongery Choose which type of ironmongery you require for window locks and latches. WhiteBrassChromeSatin Chrome Delivery Which zone would you like your window delivered to? If you need delivery outside London, select outside Zone 6. Zone 1Zones 2-4Zones 5-6Outside Zone 6 Fitting Choose which type of fitting you require. Basic fit is for buildings under construction. For all other cases, choose full fit. Delivery OnlyBasic FitFull Fit