In order to create space for the expansion project, the rental cars parking area to the north of the airport will be relocated to the main carpark.
Ms Pierre said this would put additional pressure on the capacity of the main carpark which was already tested during peak times.
"We want to reassure the public that by moving to a common pricing structure across our car parking infrastructure there will be sufficient capacity enabling visitors to find a parking space."
The short-term imperative for the airport was to optimise the existing infrastructure and minimise disruption during the expansion project, she said.
The airport's carpark underwent significant upgrades last year that introduced an additional 140 spaces in the secure parking section.
Along with the common pricing structure of $15 per day, cars parked for longer periods of time would have to pay $15 per day for the first five days and then $10 per day thereafter.