Why Do Contractors Put Trees on Top of New Buildings? (Video)

“Hi, my name is Greg Batista here to answer another question from the internet.

CuriousCranes asks: Why do I see little trees or flags on top of unfinished buildings?

That’s a tradition called “topping out.” When a building’s highest point is completed, contractors place a tree, flag, or both to celebrate the milestone. The tradition goes back centuries in Europe and symbolizes growth, luck, and safety for workers. In modern times, it’s also a morale booster for crews and a signal to owners that major progress is made. Some companies even host topping-out ceremonies. While it may seem quirky, it’s a reminder that construction isn’t just engineering — it’s also culture and tradition.

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Authoritative references: American Institute of Steel Construction (AISC) – Topping Out Ceremonies; historical construction traditions research.

The author, Greg Batista, PE, CGC, SI is owner of G. Batista Engineering & Construction and is a nationally-recognized engineer and contractor with more than 35 years of experience and offices in Fort Lauderdale, Florida.