Much of the cathedral’s new wooden roofing was dry-fitted... “But everyone involved on the project, without exception, was passionate above all.”

 “The space was small, the deadline was tight, and there were exceptional security requirements,” said Mr. Le Bras, whose company also handled most of the scaffolding and, with three others — Cruard Charpente, Métiers du Bois and Asselin — worked on the spire. “But everyone involved on the project, without exception, was passionate above all.”

“It’s almost more of a mission than a construction project,” he said.

Much of the cathedral’s new wooden roofing was dry-fitted — in Lorraine for the spire, in Normandy for the nave, and in the Loire Valley for the choir — then brought to Paris, reassembled section by section on giant platforms, and hoisted up by crane.