Ahead of the anniversary of the blaze on Friday, the mammoth cleaning job of the walls, vaults and floor is almost completed, restoring the cathedral to its original whiteness.
The inferno that engulfed the 12th century Gothic landmark on April 15, 2019 caused its central frame to collapse and ravaged the famous spire, clock and part of the vault -- shocking millions around the world.
The cathedral typically welcomed nearly 12 million visitors a year, as well as hosting 2,400 services and 150 concerts.
As an icon of the globally beloved city, the fire triggered an outpouring of generosity with nearly 844 million euros in donations collected from 340,000 donors in 150 countries to date, according to the public body overseeing the restoration.
The gaping hole left in the building is now filled by a forest of scaffolding.
The first stage of the titanic project involved clearing the rubble and burnt beams, reinforcing the flying buttresses, and removing the deadly dust unleashed from 450 tonnes of lead in the structure.
A temporary metal scaffolding had to be built for the task, which was completed last summer at a cost of 151 million euros, largely on schedule despite a three-month pause in 2020 at the start of the Covid-19 pandemic.