Three fire engines and four support vehicles attended the fire at 8.44pm on Tuesday after Singh called for aid.
The rural town of Kaihu is a 30-minute drive from Dargaville, and the only gas station for miles.
The building was old, and witnesses who saw the fire said it would have “gone up like a matchstick”.
The news will come as a bittersweet relief to the family whose home was also destroyed in the fire.
The community had speculated that the fire may have been arson after several robberies at the shop left the owners on edge and led to voluntary security being stationed outside the shop.
Bain said his team were “absolutely blown away” by the community support for the family.