Most people know LEGO started in 1932 in a small Danish town called Billund, founded by a carpenter named Ole Kirk Christiansen who’d lost his joinery business in the Depression. Fewer know that for its first 17 years, LEGO didn’t make a single plastic brick. It made wooden ducks, yo-yos, pull-along toys, and ladders.
And in 1942, almost all of it burned down.
What happened
On the night of March 20, 1942, fire broke out in the Billund factory — by then a moderately-sized wooden-toy operation employing around 35 people. The cause was never definitively established but is widely believed to have been a faulty electrical installation in the workshop area where wood-treatment varnishes were stored. The combination of timber stock, varnish vapor, and a wooden building was catastrophic.
The factory burned to the ground. Lost in the fire:
- The vast majority of LEGO’s wooden-toy inventory at the time.
- Production tooling — handcrafted wooden patterns and metal forming dies.
- Design records — original drawings, prototypes, and accumulated design knowledge dating back a decade.
- Order books and accounts — much of the company’s business records.
What survived: the office building (separate structure), the family home (also separate), and the company itself. Nobody was killed.
The rebuild
Ole Kirk Christiansen, then 51 years old, rebuilt. The post-fire factory was constructed from concrete and brick rather than timber — partly to comply with updated Danish fire regulations, partly because the wartime economy made certain materials cheaper than others. The new factory opened in 1943.
What’s underappreciated is what the rebuild forced LEGO to do internally:
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Re-design the entire product line. Without the original patterns, every wooden toy had to be re-engineered from scratch. This was painful but produced a cleaner, more standardized product range than the original — the rebuilt LEGO was, by all accounts, better than the pre-fire LEGO.
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Document everything. The lost design records were the company’s institutional memory. The new LEGO maintained much more rigorous archives — a discipline that eventually grew into the Memory Lane archive that now holds every LEGO set ever made.
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Re-think material choices. Wood was vulnerable, expensive, and labor-intensive. By the mid-1940s the company was already exploring whether the new plastic injection-molding technology could be a cheaper, safer, more consistent alternative.
The plastic pivot (1947)
In 1947, LEGO became one of the first toy companies in Europe to acquire a plastic injection-molding machine — a Hoffman, imported from England at significant expense. The company didn’t initially abandon wooden toys; both lines ran in parallel for years. But the molding capacity opened new design possibilities.
In 1949, LEGO launched its first plastic interlocking bricks, called “Automatic Binding Bricks” — clear precursors to the modern brick, but with hollow undersides and weaker grip than the design that came later. The 1958 patent — the version of the brick that defines LEGO today — is still seven years away.
Without the 1942 fire, the timeline of LEGO’s plastic shift might have looked very different. The fire didn’t directly cause the move to plastic — global trends in toy manufacturing were heading there regardless — but it cleared the slate, ended the institutional inertia of “we’ve always done it this way with wood,” and made the rebuild a natural moment to reconsider the company’s core technology.
A second fire (1960)
There’s a less-well-known second fire — February 1960 — that destroyed most of LEGO’s remaining wooden-toy inventory. After this fire, LEGO formally exited the wooden-toy business entirely. From 1960 on, LEGO is a plastic-brick company.
If you collect vintage LEGO and you’ve ever seen a wooden-toy LEGO catalog or original wooden duck for sale at a Danish auction, you’re looking at survivors — pre-1942 stock that escaped both fires, or post-1942 stock that escaped the 1960 one. Authentic pre-1960 wooden LEGO is genuinely rare. Most “LEGO wooden toys” listings on auction sites are reproductions, replicas from the LEGO House gift shop, or simply unrelated wooden Danish toys mislabeled.
A documented original LEGO wooden duck — the iconic Andersand pull-along design — sells in Danish auctions for €1,000–4,000 depending on condition and provenance. There may be 200 of them in private hands worldwide. The wooden ones, paradoxically, are now rarer than almost any plastic LEGO set.
The lesson Billund kept
Ole Kirk Christiansen reportedly told his son after the 1942 fire: “We’ve lost everything. Now we have to make it twice as good.” The phrasing in Danish is more elegant; the sentiment carries.
Eighty years later, the LEGO Group has burned down twice, almost gone bankrupt once, and shipped 8,000+ unique sets across nearly a century. The Billund headquarters still occupies the same plot of land where the 1942 fire happened. The original family still owns the company. And the Memory Lane archive that holds a sealed copy of every LEGO set ever produced exists, in part, because the people who built it never wanted to lose institutional memory to a fire again.
