Waka Kotahi said time had been lost due to extra work being required, and it was now expected to be completed in mid-November.
The different stages and locations required different on and off-ramp closures. People were asked to take extra care when travelling through the interchanges by following any temporary speed limits, traffic management and signs.
When the current works were complete, a speed restriction would remain for a settling period, ahead of final surfacing.
Waka Kotahi encouraged people to allow extra time if travelling on that section of the Waikato Expressway, recommending they merge early into a single lane to help lessen congestion.
Stay up to date with the Waikato Herald
Get the latest Waikato headlines straight to your inbox Monday to Saturday. Register for free today - click here and choose Local News.