Building Engineer is a manager and delivery man ("Candace's Big Day"). He was the first person to ask the "Too Young" line. He also sang a song about this gag. He also appeared in "Phineas and Ferb Christmas Vacation", working at the local radio station in Danville.
Appearances
- "Rollercoaster" (First appearance)
- "Run Away Runway"
- "Phineas and Ferb Christmas Vacation!"
- "Candace's Big Day"
- "Suddenly Suzy"
- "Rollercoaster: The Musical!"
- "Imperfect Storm"(Non-speaking cameo in song)