Construction of the Ōhakea Air Base's newest building has been progressing quicker than expected, the Ministry of Defence says.
Te Whare Toroa, is a two-hangar site costing $250 million and being constructed to house the air force's four Boeing P-8A Poseidons.
The first of two 500-tonne hangar roofs was lifted into place in early May.
A Ministry of Defence spokesperson said the second roof was lifted into place on July 26.
Originally the roof for hangar two was scheduled to be lifted on August 10-11 but was put in place two weeks ahead of schedule.