The linkway between Bowen House and the Beehive has also been closed until further notice.
A Treasury spokesperson said staff were evacuated as per emergency procedures after the fire alarm was triggered.
“We have been advised that a number of checks are required before staff can return to the building so all staff have been advised to go home if possible.”
Firefighters are at the scene on the Terrace. Photo / Thomas Coughlan
Georgina Campbell is a Wellington-based reporter who has a particular interest in local government, transport and seismic issues. She joined the Herald in 2019 after working as a broadcast journalist.