The Coromandel's State Highway 25A's fix has come in ahead of time and under cost.

The road between between Kōpū and Hikuai was cut in two by Cyclone Gabrielle in January, with numerous major slips blocking travel.

It'll reopen by December 20, a full three months earlier than anticipated.

Waka Kotahi's Jo Wilton says the team worked hard and planned ahead- but there were special circumstances behind this faster-than-expected repair.

"Because it was emergency work, the consenting process is retrospective. As long as we built to the standard, we could do the consenting retrospectively. Plus, we didn't need to purchase any land."

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