Auckland moves to alert level 3 from 11:59pm today for at least two weeks, to be reviewed on 4 October.
The area around Mangatangi, in northern Waikato, is under a section 70 order requiring people who live or work there to stay at home.
The rest of the country will stay at level 2, though with 100 people now allowed in indoor settings instead of 50. Read more on the updated alert levels.
There were 22 new community cases of Covid-19 reported on Monday.
Sixteen people are in hospital, four of them in ICU or HDU.
Aucklanders aged 65 and over are urged to stay home until they are vaccinated.
If you have symptoms of Covid-19 or a cold or flu, stay home and call Healthline on 0800 611 116.