Normanhurst was first settled in 1838, when the first land grant was made. It was then known as Hornsby, while the suburb that is now known as Hornsby was called Jack's Island. Growth was minimal until the 1880s, when the railway line was opened. The main Northern and North Shore railway lines joined at a station called Hornsby Junction, whereas the station one stop south on the Northern line kept the name Hornsby. Due to confusion around the similarly named stops, the postmaster demanded that Hornsby station change its name. The railway station changed to Normanhurst in 1900, and the suburb changed name at the same time. The name was derived from the name of a prominent resident, civil engineer Norman Selfe (1839–1911), with hurst being the English word for a wooded hill. Ironically, Selfe protested against the name change.
Significant development occurred in the post-war period, particularly during the 1960s, with a slight population increase over the following decades as new houses were built. The current population of the suburb is about 5,100.
The container is a standard Sistema (tm) box, with a bit of camo to help it blend in.