The photos below show a 3-in-one sash window I have been working on. The client asked for a double glazed sash window to match the original style of the windows in the neighbouring properties. The glazing bars and rails are machined slightly larger than traditional ones to accommodate the double glazed units. Low-e units and a draught-proofing system are used for improved thermal efficiency.
I will add further photographs once the window has been glazed and installed.