not realy unless you know who supplied the windows in first place,they might make you a sash to fit yourself,but they would have to mesure windo for this to be done,also if your window is internaly beaded you would have to take window out and turn it round for this to work,your best option is to buy a new 1.hope this helps
shaun www.sdwupvcrepair.co.uk, May 2008