^ abOn 21 March 2016, the member for East Hills, Glenn Brookes, resigned from the Liberal Party to sit as an independent on the crossbench. He rejoined the Liberal Party in 2017.
^ abcOn 23 January 2017, the Premier and Liberal member for Manly, Mike Baird, resigned. Liberal candidate James Griffin was elected to replace him at a by-election held on 8 April 2017.
^ abcOn 14 February 2017, the Labor member for Gosford, Kathy Smith, resigned due to ill health. Labor candidate Liesl Tesch was elected to replace her at a by-election held on 8 April 2017.
^ abcOn 15 September 2017, the Nationals member for Murray, Adrian Piccoli, resigned. Nationals candidate Austin Evans was elected to replace him at a by-election held on 14 October 2017.
^ abOn 17 December 2018, the member for Wollondilly, Jai Rowell, resigned. No by-election was held
^The changes to the composition of the house, in chronological order, were
Brookes resigned from Liberals,[a]
Burney resigned,[b]
Gee resigned,[c]
Hay resigned,[d]
Baird resigned,[e]
Smith resigned,[f]
Skinner resigned,[g]
Robertson resigned,[h]
Hidgjinson resigned,[i]
Piccoli resigned,[j]
Maguire resigned,[k] and
Rowell resigned.[l]