Which cathedral took the longest to build
Cologne Cathedral is the usual answer. Building began in 1248 and the cathedral was completed on 15 October 1880 — a span of 632 years. Of the cathedrals usually compared, it covers the longest stretch from foundation to completion.
There is a catch, and it is the interesting part: for more than half of those 632 years, nobody was building it at all.
The longest cathedral builds, compared
Measured the usual way — foundation to completion, including any pauses:
| Building | Begun | Completed | Span |
|---|---|---|---|
| Cologne Cathedral, Germany | 1248 | 1880 | 632 years |
| St. Vitus Cathedral, Prague | 1344 | 1929 | 585 years |
| Milan Cathedral, Italy | 1386 | 1965 (final details) | about 579 years |
| Ulm Minster, Germany* | 1377 | 1890 | 513 years |
| Sagrada Família, Barcelona* | 1882 | Still under construction | 140+ years and counting |
* Ulm Minster is a church rather than a cathedral, and Sagrada Família is a basilica rather than a cathedral. Both turn up in “longest to build” lists, so they are included for comparison.
Does a 369-year pause count?
This is where Cologne’s record gets complicated. The build ran in two phases:
- 1248–1473 — the medieval phase, about 225 years.
- 1473–1842 — work stopped. The half-built cathedral stood unfinished, with a crane famously left on the south tower.
- 1842–1880 — the 19th-century completion, 38 years.
So Cologne holds the record for calendar span, but the years anyone was actually building add up to roughly 263. If you count only active construction, the question gets much harder to settle, because few of the other projects kept reliable records of every stoppage either.
For the full story of why work stopped and what restarted it, see the history of Cologne Cathedral.
Why Cologne is still the fair answer
Pauses happened on almost every medieval cathedral, so stripping them out for Cologne alone would not be a fair comparison. On the measure everyone else uses — first stone to finished building — Cologne is the longest of the finished cathedrals. It is also the one where the gap is most visible: the 19th-century builders worked from medieval plans, which is why the cathedral looks like a single design rather than a patchwork of styles.
You can still see the join in the stone. The medieval parts are mostly dark volcanic trachyte; the 19th-century parts use lighter sandstone. More in what Cologne Cathedral is made of.
Frequently asked questions
Which cathedral took 632 years to build?
Cologne Cathedral in Germany, begun in 1248 and completed in 1880.
Has Sagrada Família taken longer than Cologne Cathedral?
Not yet. It was begun in 1882 and is still under construction — and strictly it is a basilica, not a cathedral.
Which German cathedral took the longest to build?
Cologne, at 632 years. Ulm Minster comes next at 513 years, but it is a church rather than a cathedral.
Is Cologne Cathedral finished now?
The building was completed in 1880, but repair and restoration never stop. We cover that on the history page.
Keep reading
- History of Cologne Cathedral — why the build stopped for 369 years
- What is Cologne Cathedral made of? — the stone from each phase
- Cologne Cathedral architecture — the Gothic design
- Cologne Cathedral facts — height, age and the numbers