Construction of a new terminal at booming Bay of Islands airport near Kerikeri is expected to start in April.

The airport's owner and operator, council-owned company Far North Holdings, hopes the multi-million dollar project will be finished by December, in time for the next tourism season.

A bigger and more modern terminal has been in the pipeline for several years but a 30 per cent in passenger numbers since Air New Zealand started flying larger aircraft on the Auckland-Kerikeri route has given it more urgency.

In the past financial year, to June 30, 2017, a record 98,844 people flew in or out of Kerikeri.

Artist's impression of the new terminal at Bay of Islands Airport. Image / Supplied
Artist's impression of the new terminal at Bay of Islands Airport. Image / Supplied

The expanded terminal will have automated check-in, roomier departure and arrival areas, and a separate luggage collection area.

During construction, the check-in and departures area will be moved into a building currently used by the Bay of Islands Aero Club. Work to convert the building is due to be completed by the end of March.

Far North Holdings chief executive Andy Nock said the project was supposed to start last year but was pushed back to future-proof the design against the potential introduction of new airport security requirements.

The winning tender to build the new terminal would be announced in April.

Mr Nock said passengers using the temporary departure and arrival facilities were likely to experience some disruption.

Public meetings at the Kaikohe RSA on March 5 and the Turner Centre in Kerikeri on March 6 would brief airport users about what to expect during construction and what the finished terminal would look like. Both meetings would start at 5pm.

Air New Zealand's withdrawal from Kaitaia had generated extra passenger numbers at Kerikeri but most of the growth was because of increased tourism and business traffic between Auckland and the Bay of Islands, Mr Nock said.

The growth had been enabled by larger aircraft and boosted by effective marketing, including a close partnership between Air New Zealand and the Bay of Islands Marketing and Promotions Group.

The national carrier had been operating an extra three flights a week between Auckland and Kerikeri since November. In the second half of 2017, 6000 more passengers used the terminal than in the same period in 2016.