Immediate Cause of the Fire
The fire that damaged Notre Dame on April 15, 2019, was caused by a short circuit in the electrical system. Investigators concluded that the blaze started beneath the roof near the transept, where aging wiring sparked and ignited flammable materials.
How the Fire Spread So Quickly
Strong draft effects inside the stone structure pulled flames up through the roof space. The wooden attic, known as the "forest," burned rapidly, and the collapse of the spire and roof spread hot embers across the interior, accelerating damage to the vaults.
Investigation Findings and Official Conclusions
French prosecutors ruled out deliberate arson and a criminal origin. The official report pointed to a combination of electrical failure, ongoing renovation work, and gaps in fire detection and response systems.
What This Means for Notre Dame's Future
The findings have shaped stricter safety rules for historic buildings worldwide. Restoration efforts now focus on updated wiring, fireproofing, and monitoring systems to protect the cathedral during and after reconstruction.
