Bob Budowniczy to serial dla najmłodszych. Fabuła skupia się na Bobie, pracowniku budowlanym, który wraz z przyjaciółmi wykonuje różne zlecenia, przy których potykają go różne przygody.
Bob puts Leo in charge of overseeing the building of a maze on the grounds of Fixham Castle while he and Wendy refurbish the interior. Scoop encourages Leo to make the maze more difficult and to add mirrors to it, but when the vehicles test it out they all get lost.
When Muck feels bad for collapsing Bob's first build - his old shed, Scoop tells him the story of how the young Bob built it and all the mistakes he made along the way.
Dizzy is fascinated by the way that the new traffic lights direct the movement of cars. But when she tries directing the team instead of doing her job, all the traffic-light poles fall down, causing the biggest traffic jam in Spring City history.
While the team are building an aviary at the zoo, Scoop mistakes a parrot's voice for Bob's and releases the whole flock. Can Bob figure out a way to lure them all back inside?
Scoop and Ace are put in charge of decorating two barns for Farmer Pickles. Ace's is very impressive, but Scoop will stop at nothing until his barn is the best...
Lofty is keen to impress newcomer Cherry and changes his behaviour, acting on Two-Tonne's advice. But his plans are ruined when Whizzer shows up on the build...