| ...Because the worst part of the party is the cleanup, am I right?
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Building Engineer is a manager and delivery man. He was the first person to ask the "Too Young" line, and he also sang a song about it. He also appeared in "Phineas and Ferb Christmas Vacation", working at the local radio station in Danville.
- "Rollercoaster" (First appearance)
- "Run Away Runway"
- "Phineas and Ferb Christmas Vacation!"
- "Candace's Big Day"
- "Suddenly Suzy"
- "Rollercoaster: The Musical!"
- "Norm Unleashed"(Non-speaking cameo in song)
- "Imperfect Storm"(Non-speaking cameo in song)