The Great Fire of London 1666: Four Days That Reshaped a City

In September 1666, London experienced its most catastrophic disaster: a conflagration that destroyed the medieval city and inadvertently created the modern metropolis.

The Fire's Progress

Start: Sunday, September 2, ~1:00 AM, Thomas Farriner's bakery on Pudding Lane.
Spread: Tinder-dry summer, gale-force easterly winds, densely packed timber-framed buildings with overhanging upper floors (jetties) creating fire tunnels.
Duration: Four days (Sept 2-6), finally checked when winds died and gunpowder demolitions created firebreaks.
Area Destroyed: 436 acres (1.76 km²)—80% of intramural City of London.

Losses

• Buildings: 13,200 houses, 87 parish churches, 44 company halls, St. Paul's Cathedral (old), Royal Exchange, Guildhall, Bridewell Palace, 3 city gates
• Human: ~100,000 homeless (1/6 of London's population). Official deaths: 6 (vastly undercounted; poor/undocumented unrecorded)
• Economic: £10M+ (equivalent to ~£2B today)

Response and Aftermath

Firefighting: Primitive—hooks, buckets, primitive engines, demolition. No fire brigade existed (insurance company brigades formed after).

Rebuilding: Rebuilding Act 1667 mandated brick/stone construction, wider streets, party walls, Thames water access. Christopher Wren's masterplan (grand boulevards, piazzas) rejected—property owners rebuilt on medieval plots. Wren rebuilt 51 churches + St. Paul's.

Insurance Birth: Nicholas Barbon's "Fire Office" (1667) = first fire insurance, spawning modern industry.

Monument: Wren's 202-ft Doric column at Pudding Lane/Fish Street Hill—height = distance from fire's origin.

Legacy

The fire purged plague-ridden slums, forced building modernization, and catalyzed financial innovation. London emerged safer, more spacious, and architecturally unified—the city we recognize today born from ashes.