The Victorian Electoral Commission on Monday evening confirmed Lower house Speaker Maree Edwards issued a writ for the Mulgrave by-election to be held on November 18, after Mr Andrews quit politics last month following almost nine years as Victorian premier.
The date was flagged late last week, with electoral commissioner Sven Bluemmel on Monday urging tens of thousands of residents to make sure their details were correct before the poll.
Mr Bluemmel said prospective candidates should act quickly to avoid missing out on lodging their nominations.
The deadline for registered political parties to nominate their endorsed candidates is 12pm on November 1, while independent candidates have to lodge their nomination forms along with a $350 deposit by noon the following day.
The electoral commission was expected to hold an information session about the key requirements for nominating for a by-election on Wednesday.
The election manager would draw candidates' names to determine their position on the ballot paper on November 2, the commission said.
Opposition Leader John Pesutto on Friday confirmed the Liberal Party would run a candidate in the by-election, saying people "deserve a choice".
Dandenong mayor Eden Foster, who grew up within Mulgrave's suburbs of Noble Park and Springvale, has been confirmed as Labor's pick.
Ms Foster's fellow councillor Rhonda Garad has been pre-selected as the Victorian Greens' candidate.
Mulgrave will be the second Victorian state by-election this year after the Liberals retained the seat of Warrandyte in Melbourne's northeast following the retirement of veteran MP Ryan Smith.
Labor did not contest the Warrandyte by-election.
Mr Andrews was MP for Mulgrave since 2002, when the seat was re-created after being abolished in 1967.
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