Opposition leader Judith Collins urged tougher penalties for those who do not follow advice on isolation. "No one wants to be yo-yoing in and out lockdown," Collins said in a statement.
The new lockdown, part of Level 3 curbs, lets people leave home only for essential shopping and work, while public venues will stay shut. Curbs elsewhere in New Zealand are to be tightened to Level 2, setting limits on public gatherings.
Since the outbreak, New Zealand has recorded 2,000 infections and 26 deaths.