Check the timetable below for the key dates in the Hamilton West by-election, including when you needed to enrol by and when you could vote.
| Thursday 20 October | Hamilton West electorate by-election dates formally announced |
| Thursday 20 October | Regulated period for election expenses starts day after notice of vacancy published |
| Wednesday 2 November | Writ Day Governor General issues writ directing the Electoral Commission to hold the Hamilton West by-election Electoral Rolls close for printing Voters enrolled after this date cast a special declaration vote |
| Tuesday 8 November, noon | Nominations close for candidates in the Hamilton West by-election |
| Wednesday 9 November, 4pm target | Hamilton West by-election candidates announced by the Electoral Commission Ballot paper printing starts |
| Wednesday 23 November | Overseas voting starts |
| Monday 28 November | Advance voting starts |
| Friday 9 December | All political advertising ceases and election signs taken down by midnight Last day for overseas voters to enrol |
| Saturday 10 December | Election day for Hamilton West by-election Last day for voters in New Zealand to enrol Voting places open from 9am to 7pm |
| Saturday 10 December | Preliminary Results progressively available from 7pm on www.electionresults.govt.nz. Targets for release are: - by 9pm results from 50% of voting places - by 10.30pm results from 95% of voting places These are targets not guarantees. |
| Wednesday 21 December | Official Results declared (including special declaration and overseas votes) |
| Monday 16 January | Deadline for applications for judicial recount |
| Tuesday 17 January | Return of Writ by Electoral Commission naming successful candidate (presuming no recount) |
| Wednesday 12 April | Deadline for Returns of Candidate Election Expenses and Donations to Electoral Commission |