Millions in renovations to Great Lakes Secondary School and demolition plans at Imperial boosted Sarnia's construction activity last month.
City hall issued 66 permits worth just over $30-million in October.
A $21.7-million permit was issued for an addition to the high school at 340 Murphy Rd.
Great Lakes Secondary will have a new auditorium, indigenous community room, updated classrooms and accessibility improvements.
Students are expected to return to the building in September of 2018.
13 demolition permits were issued to Imperial's Sarnia Manufacturing Site at 602 Christina St. south, the largest for $1.6-million.
There were six building permits issued for single family homes in October for a ten-month total of 88.