Local Government Act 2019

(1) A council for a municipality may decide that the only way to vote in a by‑election (a mandatory postal vote election) is by postal vote.

(2) If the council does so, the council must, within 2 months after the Electoral Commissioner is notified of a casual vacancy under section 51(3) or (4), 53(2), 56(7) or 133(6) or confirms the casual vacancy under section 52(3), pass a resolution declaring the by‑election to be a mandatory postal vote election.

(3) As soon as practicable after the council passes the resolution, and in any event not later than 5 days after the passage of the resolution, the council must notify the following persons that the resolution has been passed:

Electoral Commissioner;