But six months on, work has barely begun to restore the charred building, despite French President Emmanuel Macron’s tight five-year deadline to rebuild it.
As Associated Press reports, there have been months of delays in the pledged millions materialising, leaving officials reliant on small charity donations to fund early repairs.
The Notre Dame Foundation has received just €36 million ($A59 million) from 46,000 individuals, 60 businesses and 29 municipalities between April 15 and the end of September, with some donations as small as one euro, AP reported.
Salaries of workers who have still been cleaning the site of the fire have been paid through smaller, individual donations from people in France and the United States.
Finally, though, the massive donation cheques are starting to roll in.
On Tuesday in Paris, French billionaire Francois Pinault and son Francois-Henri Pinault officially signed documents to hand over €100 million ($163 million) toward rebuilding the cathedral.
Francois-Henri Pinault is the husband of Hollywood star Salma Hayek and owner of Parisian luxury group Kering, which owns Gucci and Saint Laurent.
His was the first major pledge when he promised €100 million within hours of the tragedy.
“Faced with this tragedy, my father and I have decided to contribute to the funds needed to fully rebuild Notre Dame de Paris, in order to bring this jewel of our heritage back to life as soon as possible,” he said at the time.
Minutes later, Pinault’s rival, Bernard Arnault, who is one of the world’s richest men, doubled Mr Pinault’s offer and pledged €200 million ($A326 million).
Mr Arnault is the CEO of LVMH, which encompasses luxury brands like Louis Vuitton, Sephora and Marc Jacobs. He finalised his donation last week, AP reported.
The Bettencourt Schueller Foundation of the L’Oreal fortune also promised €200 million.
Francois Pinault said he was announcing the donation publicly in the hope others would chip in, too.
“It is certainly vulgar to make a gesture and then promote it, but the idea was to generate others,” he said.
A spokesman for the family pointed out it had donated more than €10 million ($A16 million) in emergency funds in June.
The donation from the Pinaults is expected to boost the massive repair and restoration project for Notre Dame, which has so far been focused on cleaning and safety work.
It costs €31 million ($A50 million) to simply preserve the building in its current state.
Archbishop of Paris, Michel Aupetit, said the Pinaults’ donation pledge, within hours of the fire, spurred a movement.
“It came spontaneously during that evening, when we didn’t yet know whether the cathedral could be saved,” he said.
“It launched a movement that is still ongoing, because we still have 140 donations a week.”
The archbishop said authorities wouldn’t know the total cost or duration of the repair project until next year.