Mainfreight implemented a surcharge on November 21 to all inter-island freight movements and to trips between Marlborough and the mid to lower South Island.
"Due to these unforeseen forced operational changes and extended transit times required to service freight ... we regretfully must look to our customers to make a contribution to allow us to sustain these services," the company said on its website.
Freight company Toll NZ has also increased its prices due to the "considerable additional costs" it has incurred following the quake.
"We seek your understanding with the resulting surcharge we have to apply to all inter-island and also intra-Island for Marlborough freight forwarding consignments ... to cover these costs," business development and sales general manager Roberto Brad said.
For north-bound South Island freight, Toll NZ has added a 10 per cent surcharge.
South-bound freight from Auckland and Northland has a 19 per cent surcharge, while 25 per cent is being charged to south-bound freight from Waikato, Bay of Plenty, Taranaki, Hawke's Bay, Manawatu, Wairarapa, Wellington and Marlborough.
- additional reporting Otago Daily Times.