When was the Notre-Dame fire: verified timeline and key facts

Why this date matters: an overview of the Notre-Dame fire

On 15 April 2019, a major fire broke out in Notre-Dame de Paris, drawing global attention to the Gothic cathedral’s fragile condition. The fire began in the roof space during restoration work and rapidly damaged the spire, most of the roof, and portions of the stone vault above the nave. This verified explainer outlines the precise timeline, ignition sources under investigation, structural consequences, human factors, and the ongoing restoration and conservation strategy that followed. Understanding these facts clarifies what happened, what changed, and what remains uncertain.

Confirmed timeline: key moments on 15 April 2019

Early warnings and first alerts

At 18:18 Central European Summer Time (CEST), the first fire alarm triggered in the cathedral’s attic. Initial inspections by the on-site security team did not locate an active fire; by 18:28 CET, a second alarm sounded. Church employees and later visiting contractors briefly searched the attic, reported no visible flames, and concluded the situation was under control before leaving for the evening.

Rapid escalation and structural failure

By 18:50 CET, smoke was clearly visible from the exterior. Around 18:55 CET, the iconic 93-meter spire collapsed. Between 19:00 and 20:00 CET, the fire intensified, destroying two-thirds of the oak timber roof and causing the rib vaults above the nave to weaken and partially collapse. Firefighters reached the site within minutes but faced challenges accessing fragile medieval structures and limited water pressure from on-site hydrants.

Containment and extinguishment

The main front structures and towers were largely preserved, but the attic and roof were nearly fully engulfed. By 01:20 CEST on 16 April, firefighters declared the main fire extinguished. A second, smaller flare-up occurred at around 09:30 CEST, which crews quickly suppressed. The fire was officially under control by mid-morning on 16 April.

Probable cause and ignition theories

Multiple hypotheses have been examined. French authorities concluded the most likely source was an electrical short in the wiring associated with the restoration work underway since 2018; investigators also reviewed other potential causes including discarded cigarette butts and a possible scaffold-related ignition. In April 2023, investigators reported they had identified a short circuit in the electrical system used for the renovation as the probable origin. As of 2024, the official technical report has not been fully published in detail, though judicial inquiries into workplace safety and compliance with restoration permits remain ongoing.

Immediate impact on structure and artworks

Roof and spire losses

The oak attics, collectively termed "the forest," largely vanished. The lead spire, installed in the mid-19th century, collapsed into the nave. Much of the lead roofing melted, releasing hazardous lead particles into the surroundings and complicating initial firefighting efforts.

Vaults and crossing stability

Parts of the rib vaulting above the nave collapsed, while the south tower’s structural system remained largely intact. Engineers concluded the piers and flying buttresses largely held, preventing collapse of the west front and southern walls, but the upper crossing and nave required temporary shoring and extensive stabilization.

Art and artifacts

The majority of movable artworks had been evacuated prior to the fire. The choir organ, several stained-glass windows (some restored), and many liturgical objects were damaged or lost. Notably, the Crown of Thorns and other relics were moved to safety earlier the same day, a decision credited with preserving key treasures.

Restoration and conservation since the fire

Stabilization 2019–2020

After the fire, crews installed protective hoardings and temporary roofing to shield the fragile stonework from weather. By late 2020, the structure was weathertight, and detailed surveys informed long-term conservation planning.

Long-term restoration strategy

In November 2021, a major consolidation and cleaning campaign began, focusing on masonry, stained glass, and the damaged vaults. As of 2024, the cathedral remains closed to visitors; services continue at nearby locations. The restoration aims to preserve the historic fabric while integrating discreet modern interventions. Completion of the main structural and artistic restoration is projected for 2025–2026, subject to approvals and funding, with the full reopening timeline remaining under active assessment.

Frequently asked questions

• When was the fire first reported? The first fire alarm was triggered at 18:18 CEST on 15 April 2019.
• What part of the structure was most affected? The oak timber roof (the attic), the spire, and portions of the rib vaults above the nave sustained the most damage.
• Were any major artworks destroyed? The most important movable objects had been removed earlier that day; some stained glass and the choir organ were damaged.
• What is the current status of restoration? Stabilization is complete; major masonry and stained-glass conservation is underway, with projected completion of primary restoration in 2025–2026 and full reopening under review.
• What caused the fire? Investigators identified a probable electrical short in temporary restoration wiring as the most likely cause; judicial inquiries are ongoing.

Key reference table: dates, structural elements, and status indicators