Firefighters are continuing to battle a blaze at a commercial building in Trentham, north of Wellington.
Emergency services were alerted to the fire on Alexander Road, just before 7pm.
Fire and Emergency said the shed was well alight when crews got there.
Twelve crews remained at the scene and the fire has been contained.
There were no reports of injuries.
Onlookers and residents posted on social media about the blaze and flames could earlier be seen edging closer to the road.
Thick grey plumes also covered the air.
The police were at the scene directing traffic, but have since left.