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How Long Did It Take to Build Chartres Cathedral?

Short answer: about 26 years, from 1194 to 1220.

Its great relic is the tunic of the Virgin Mary, said to be a gift from Charlemagne. Historians doubt it.

Chartres Cathedral
Chartres Cathedral. Photo: Gzen92 · CC BY-SA 4.0 · Wikimedia Commons · resized

What the sources say about the building period

Partly built from 1145; reconstructed over 26 years after the fire of 1194. UNESCO World Heritage Centre Official source

Stone and crew in numbers

Country and type
France, cathedral
Stone in the walls
55,000 to 90,000 m³ Estimate
For comparison
about 29 Olympic pools of stone, or 7,250 truckloads
Average crew
about 333 workers (model value: the crew that would need exactly this long, working without a break)

Volume basis: 130 m long; nave 16.4 m wide, 37 m high; transept 64 m. Checked against measurements. Our estimates come from published dimensions and are shown as a range. The result is a simple model, not a measured fact.

Where the stone came from

Berchères limestone from quarries in Berchères-les-Pierres, about 5 km south of Chartres, according to this source. Some stone may come from the Paris area. EarthCache Chartres (geocaching.com) Secondary, provisional

Plan

Chartres Cathedral: floor plan with stained-glass windows
Chartres Cathedral: floor plan with stained-glass windows. Plan: Eusebius (derivative work) · CC BY-SA 3.0 · Wikimedia Commons · resized

Legend: tradition, not evidence

The tunic of the Virgin Mary kept at Chartres, the Sancta Camisia, is said to be a gift from Charlemagne.

What we know: Historians doubt it, since Charlemagne never went to the Holy Land. The relic still made Chartres a pilgrimage town.

Wikipedia: Chartres Cathedral Tradition, not evidence

Build it yourself

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