Plumber Registration NZ - How to be certified ? (Auckland)

Hello,

My partner is currently holding a Working Holiday visa till November Protected content NZ.

He is a 8 year experienced plumber and was running his own business for three years in France. He would like to get his registration in order to be a registered plumber in NZ.

Could you please let us know how we can proceed to get this registration?

I thank you very much in advance for your answer.

Best regards.

Celine