The company opened a Levin branch earlier this year and completed a new facility at Tauranga.
Projects for Gore, Spring Creek and Whakatane are in the design and build phase.
In warehousing, there had been increased levels of sourcing enquiry.
Three new warehouses had opened since March– two in Auckland and one in Hamilton.
In its ocean and air transport division, Mainfreight had made a "courageous effort" in transporting personal protection equipment needed for the Covid-19 pandemic.
The company said there had been ongoing trading improvements from established customers, and increasing market shares across all three divisions.
Seasonal increases in trading, pre-Christmas, were expected and the company remained "cautiously optimistic".
In the year to March 31, Mainfreight's profit came to $147.98m, up $6.89m or 4.9 per cent on the previous year's.
Mainfreight's first half result is due on November 11.
The stock last traded at $51.01, having gained 23 per cent over the last 12 months.