A sub-contractor was working at an address in Puslinch Township when a slab of quartz fell on him.
It happened Tuesday around 10:40 a.m. at a residence under construction on Concession 1.
The quartz was being installed when the incident occurred.
The 24-year-old male from Hamilton was transported to Cambridge Memorial Hospital.
Wellington County OPP, Guelph-Wellington Emergency Medical Services and Puslinch Fire and Rescue Services responded.
The Ministry of Labour has been notified and will attend.
