The Sydney Opera House is 183 metres long. This is the building's approximate overall length along Bennelong Point, measured from its southern approach toward the northern end of the complex.
That length is part of a striking overall scale: the building is about 120 metres wide at its widest point and covers roughly 1.8 hectares of land. Its dramatic roof forms make the structure look even larger, although the “shells” are precast concrete panels supported by ribs rather than thin seashell-like structures.
The dimensions belong to Jørn Utzon's iconic performing-arts complex, which was built at Bennelong Point in Sydney Harbour. Construction began in 1959, and the building officially opened on 20 October 1973—about a decade later than the original target date.
A common mix-up is confusing the Opera House's 183-metre length with its height. The highest roof point reaches about 67 metres above sea level, while the building's listed height is often given as roughly 65 metres.