The property of Essington was purchased in August 1980 with the vision to start a Christian school. 'Essington House,' a significant historical building to the local area, was built in 1860.  The building, which includes convict bricks displaying the heart motif, is set on 0.5 hectares. Originally it was built to be the site of an old toll-bar with the residence for the tollgate master. Toll-bars were barriers at which tolls were collected. They came into operation in NSW in 1810 and continued until 1896. 'Essington House' was built when the new road to Nepean River at Emu Plains was opened. 

'Essington House' was renovated in 1940 and used as a doctor's surgery before being purchased by Foursquare Gospel Church, Parramatta in 1980. It was restored and officially opened on 19th March 1983, with the launch of the school known formally as 'Essington Christian Academy', with 9 students. The name was changed to Westmead Christian Grammar School in 2010. Further renovations commenced in 1992, as the school expanded and again in 2012. Despite changes to name and building, the mission of the school remained strong, and continues into the future.