The long-awaited extension of Highway 404 north of Toronto will be delayed by at least another year.

The transportation ministry now says a 13-kilometre extension north of Newmarket that had been expected to open in early 2013 will not be open until sometime in 2014.

Mny overpasses have been built and work is underway, but the work is nowhere near finished.

A ministry spokesperson says wetter sub-surface soil, delays in acquiring property, and challenges in relocating utilities have all been factors in the delay.