"We remind people [of] the dangers of using multi-boxes and extension chords and leaving stuff charging overnight.
"It's really important to make sure that they are monitored, and they are checked, turned off and not in use," said Hamilton.
He said to also make sure multi-boxes are not overloaded.
The owner said on Friday the shed and house were insured, but the fire "was devastating".
His partner and teenage son were in the house when the fire started. They escaped unscathed, but the shed was completely destroyed and the house had "extensive smoke damage".
He said the shed was a "man cave" and had items like couches inside.
A neighbour said she called 111 after she smelled smoke and then saw the fire. She said the flames were as high as the trees on the property.
- starnews.co.nz
