Leitch's reputation as an architect was damaged as a result of the Ibrox disaster of 1902, when 25 people were killed when a bank of wooden terracing collapsed due to substandard pine being used in the terraces. Leitch, in attendance at the disaster, convinced Rangers to hire him to build the replacement stand. Leitch patented a new form of strengthening terraces for the Ibrox rebuild. Over the next four decades he became Britain's foremost football architect. In total he was commissioned to design part or all of more than 20 stadiums in the UK and Ireland between 1899 and 1939, including: