A man working at a New Plymouth school suffered serious injuries after being shot in the head with a nail gun.

WorkSafe is investigating an incident which happened two weeks ago where a nail from a nail gun was found in a worker's head. The worker had been working at Woodleigh Primary School, a WorkSafe spokesperson confirmed.

The investigation into the May 16 incident is underway and could take up to a year to complete.

The man, understood to be a building contractor, was treated at Taranaki Base Hospital with serious injuries before being transferred to Wellington Hospital, according to Stuff. The man has since been discharged.

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Ministry of Education head of education infrastructure service Kim Shannon said the ministry was aware of the incident and had offered support to the school

"As the incident is being investigated it would be inappropriate to comment further."

Woodleigh School is a decile 7 school based in Frankleigh Park with a roll of 400 students, according to the school's website.