Old St Paul's Cathedral in length including the portico, and across the transepts, and Winchester Cathedral, the longest remaining medieval church, is long and across the transepts. The cathedral had one of Europe's tallest church spires, the height of which is traditionally given as , surpassing all but Lincoln Cathedral. The King's Surveyor, Christopher Wren (1632–1723), judged that an overestimate and gave . William Benham noted that the cathedral probably "resembled in general outline that of Salisbury, but it was a hundred feet longer, and the spire was sixty or eighty feet higher. The tower was open internally as far as the base of
Salisbury Cathedral spire, which at dominated the Wiltshire skyline from 1320. Because most of the cathedral was built in only 38 years, it has a single consistent architectural style, Early English Gothic. Although the spire is the cathedral's most impressive feature, it has proved to be troublesome. Together with the tower, it added 6,397 tons (6,500 tonnes) to the weight of the building. Without the addition of buttresses, bracing arches and anchor irons over the succeeding centuries, it would have suffered the fate of spires on other great ecclesiastical buildings (such as Malmesbury Abbey, 1180 to 1500; Lincoln Cathedral, 1311 to 1549;