The Great Fire of London Destroyed 13,200 Houses — But Killed Almost Nobody

For four days in September 1666, London burned. The fire started in a bakehouse on Pudding Lane in the early hours of September 2 and spread westward through the tightly packed timber buildings of the medieval city, driven by a dry summer and strong winds, until it had consumed roughly 80 percent of the City of London within its ancient Roman walls. When it was finally brought under control on September 6, the scale of destruction was staggering: 13,200 houses, 87 churches (including the original St. Paul's Cathedral), 44 livery company halls, the Royal Exchange, the Custom House, and most of the civic infrastructure of England's greatest city. And yet only six deaths were officially recorded.

The Spread of the Fire

The conditions in London in the summer of 1666 were almost ideal for catastrophic fire. A prolonged drought had dried out the timber-framed, closely packed medieval buildings that made up most of the city. The streets were narrow — many just a few meters wide — and buildings on opposite sides were often close enough to touch at upper-story level. Thatched roofs, a fuel source that fire could spread across without contact, were common. The bakery on Pudding Lane had an oven that had been burning for days without adequate cooling.

The fire moved westward with the east wind. Firefighting in 1666 depended primarily on creating firebreaks — pulling down buildings ahead of the fire to deny it fuel — but the initial response was slow. The Lord Mayor of London, Thomas Bloodworth, famously dismissed the first reports as trivial, reportedly saying that "a woman might piss it out." By the time the scale of the disaster was recognized, the fire had established too wide a front to be easily stopped.

Over four days, it consumed the equivalent of roughly one square mile of the city. The heat was intense enough that buildings not yet reached by the fire were destroyed by radiated heat alone. The fire could be seen from Oxford, 60 miles away.

Why So Few Died

The officially recorded death toll of six is almost certainly an undercount, and historians have debated the true mortality for centuries. Several factors explain both why the death toll was low and why it may have been even lower than casual observation would suggest.

The fire moved relatively slowly by modern disaster standards. It burned for four days, and the direction of its advance was broadly predictable — driven by the east wind, moving westward through the city. Most residents had time to flee ahead of it, taking what they could carry. Contemporary accounts describe hundreds of thousands of people evacuating into the surrounding fields and open areas outside the city walls, their possessions piled around them. Samuel Pepys, whose diary provides the most vivid contemporary account of the fire, describes the chaos and the crowds but not mass casualties.

The medieval city was also, despite its population, less densely inhabited than a modern urban area by nighttime. Many residents would have been awake and able to respond. The fire's progression through specific neighborhoods gave local warning before it arrived.

The six recorded deaths are the known, documented cases. The true toll was likely higher — particularly among the elderly, sick, and destitute who could not flee easily, and among those whose deaths in the chaos went unrecorded — but the extraordinary scale of physical destruction without proportional mortality remains one of the most striking features of the event.

A City Remade

The Great Fire, whatever its true death toll, transformed London. The medieval city it destroyed was replaced over the following decades by a brick-built, somewhat more fire-resistant city designed in part by Christopher Wren, whose rebuilt St. Paul's Cathedral remains a defining feature of the London skyline. Wren proposed a comprehensive replanning of the entire city, but property disputes and the urgency of rebuilding prevented wholesale redevelopment. London rebuilt roughly on its old street plan, but in more durable materials, with wider streets and regulations that would not be fully effective until the Victorian era.