Introduction In the domestic and commercial properties of Ayrshire, a region defined by its proximity to the Firth of Clyde and the prevailing south-westerly winds from the Atlantic, the issue of draughty windows is not merely a minor inconvenience—it is a persistent challenge to thermal efficiency, occupant comfort, and building preservation. From Victorian tenements in Kilmarnock and Ayr’s New Town to post-war council houses in Irvine and Cumnock, countless buildings suffer from air leakage around window frames. Repairing draughty windows in Ayrshire requires a nuanced understanding of local housing stock, climate conditions, and the balance between traditional conservation techniques and modern energy-efficiency standards. This essay provides a complete overview of the causes, diagnostic methods, repair strategies, and regional considerations specific to draughty window repair in Ayrshire. 1. The Ayrshire Context: Climate and Building Stock Ayrshire experiences a temperate maritime climate characterised by high annual rainfall, humidity, and persistent winds. Average wind speeds often exceed 10–15 mph, and exposed coastal locations like Troon, Prestwick, and Largs face even harsher conditions. Consequently, window seals degrade faster, timber frames warp, and sash cords slacken more rapidly than in sheltered inland areas.