Peterborough and Selwyn fire crews battled a fire at Robert Young Construction on Chemong Road on Thursday night.
Neighbours called 911 before 11 p.m. when they spotted smoke coming from the building.
The charred cab of a transport truck was pulled from the building.
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Investigators say someone had been working on the transport earlier in the day. There was significant smoke damage in the building and the truck is considered a write-off.
No injuries were reported.
Damage is estimated in excess of $100,000.
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