About Us We also specialise in all other period windows and doors and any replacements are custom made to fit in with the character of your property. With over 15 years experience within the industry, Oxford Sash Window Co have specialised in renovating and draught proofing traditional sash windows to the highest quality and specifications and for maximum energy conservation. Our Services Renovation and replacement, sash and traditional timber windows, full draught proofing service, custom made traditional box frames, single or double glazed. Call for advice and a free survey. Oxford Sash Window Company Ltd 'Opening Your Windows To The World'