The cost of expanding a terminal at Hong Kong's Chek Lap Kok airport is likely to increase by 47% from the original estimate by the time the construction starts in 2019.
The new estimated cost of HK$14bn ($1.8bn) was suggested by a former president of the Hong Kong Institution of Engineers Greg Wong Chak-yan, based on 5 to 6% annual increase of construction costs, reported The South China Morning Post.
The Airport Authority Hong Kong had originally estimated the expansion to cost HK$9.5bn ($1.22bn) in 2010.
Chek Lap Kok airport intends to expand the terminal to support the construction of a third runway.
The new runway will enable the airport to handle 102 flights an hour as against the current 68.
The airport's existing runway capacity is anticipated to reach its limit between 2019 and 2022.
The terminal, opened in 2007, will be closed for the construction work until 2023.
The building has 56 passenger check-in counters, restaurants and shops, but lacks an arrival hall.
The proposal for new runway is being criticised as it would increase traffic at the airport, putting pressure on the local authorities to coordinate airspace with mainland authorities.
In addition, the project is likely to face legal and constitutional issues regarding immigration checks.
Image: The new runway will increase the airport's capacity to 102 flights per hour from 68. Photo: courtesy of Toyotaboy95.