The fourth season premiered in the UK between September 12th to December 5th, 2000 on BBC. In the US, the fourth season premiered between March 12th to March 28th, 2002 on Nick Jr. and was also later re-shown on Noggin, PBS and PBS Kids Sprout.
| || Episode|
US title (bottom)
|"Roley and the Rock Star"|
|Roley gets excited when Bob builds a pond in his favorite rock star's garden.
|Bob and Scoop discover some old bones in a ditch at Farmer Pickles' field. While Bob is out at the museum, Spud persuades Scoop to see some bigger bones that he found. Mr. Ellis thinks that a stegosaurus skeleton was found, but some of its bones are missing.
|While some tires are being dropped off for Farmer Pickles, Scoop starts sneezing, which prompts Bob he has hay fever. He sends Scoop back to the yard, but he still sneezes. Bob lets Spud figure out what is causing Scoop to sneeze.
|"Roley's Animal Rescue"|
|Bob discovers a porcupine asleep in Farmer Pickles' cottage and Scoop takes it back to the yard, while Roley looks after it.
|Bob and Wendy are working on painting Farmer Pickles' farmhouse with Dizzy guarding the wet cement. But when Spud tries to paint it, he makes a big mess.
|"One Shot Wendy"|
"Wendy Plays Golf"
|Bob and the gang are building a crazy golf course. Wendy discovers that she has the instructions for the windmill, that Bob is preparing, yet when she phones him, he says he doesn't need them.
|"Spud Lends A Hand"|
|A rainwater tank is being put up next to Farmer Pickles' barn. While Bob is not around, Spud makes Lofty lift the tank into place. But instead of landing properly, it rolls down a hill and smashes a wooden boat for Wendy's nephew.
|"Bob and the Bandstand"|
|Bob's gang are preparing Farmer Pickles' bandstand. But then the sheet music falls out of Travis' trailer and Spud starts making paper airplanes with it.
|"Farmer Pickles' Pigpen"|
|Farmer Pickles is phoning Bob to build a doghouse for Scruffty, but he accidentally drops the phone. At the same time, Mrs. Percival phones Farmer Pickles to look after the guinea pigs over the school holiday.
|"Bob on the Run"|
|Mrs. Percival is raising money for a new clubhouse. Bob sponsors it with a Runathon and the machines sponsor it by demolishing the old pavilion.
|Bob's personal organizer (which gives details of all of his jobs) breaks down. He tries to remind himself by tying knots in his handkerchief, but gets them mixed up.
|"Scruffty The Detective"|
|A time capsule is being built for Mr. Ellis and will be buried outside the museum. However, Spud thinks it is a treasure chest and he empties the contents of it and almost buries it.
|Wendy is on her day off doing some watercolor painting, but Scruffty buries her phone.|
- Farmer Pickles
- Mrs. Potts
- Mrs. Broadbent
- Mrs. Percival
- Mr. Bernard Bentley
- Mr. Dixon
- Mavis (mentioned)
- Lennie Lazenby (Roley and the Rock Star)
- Mr. Ellis (Scoop's Stegosaurus)
- Scruffty (Roley's Animal Rescue)
- Mr. Beasley (Forget-Me-Knot Bob) (In physical appearance)
- This was the first season to show Mr. Beasley in physical appearance as before he was just mentioned.
- This season marks the first appearances of Lennie Lazenby, Mr. Ellis and Scruffty
|Project: Build It|