The eleventh season premiered in the UK in between June 1 to June 24, 2005 on Cbeebies. In the US, the eleventh season premiered between October 29 to December 3, 2005 on PBS and debuted on Sprout in early 2007.
| || Episode|
US title (bottom)
|"Scrambler in the Doghouse"|
|Bob makes Scruffty a unique kennel using recycled scrap after Scrambler smashes all of the building materials.
|"Benny's Important Job"|
|Bob builds the Bentleys' new home into the side of a hill, and Benny is determined to help, but keeping up with the big diggers is harder than expected.
(Storyline by Marc Seal)
|Spud helps Bob put together the machinery for Farmer Pickles' sunflower oil factory.
|Roley finds a way to keep the Birdie and her chicks cool in the storeroom.
|"Dizzy the Detective"|
|A millstone goes missing, so Dizzy and Spud try to track it down by following a trail of clues.
|Travis has a lot of work on his hands when he tries to do two jobs at once.
|"Scrambler and the Colorful Cave"|
|Scrambler stumbles across a strange cave while helping an expert on the Stone Age to decorate his house.
|"Spud's Bumper Harvest"|
|Spud causes chaos when he stores a bumper crop of sunflowers in Bob's mobile home.
|Muck is told to lead a convoy to the mill, but he cannot remember Bob's directions to get there.
|"While Bob's Away, Robert Will Play"|
|Robert turns Bob's old rubble chute into a children's playground, with a little help from some squirrels.
|"Bob's Three Jobs"|
|Bob plans to go bird-watching with his dad, but has three very important jobs to finish first; which take longer than expected.
|"Scoop Knows It All"|
|Farmer Pickles is ready to open his sunflower oil business, but needs a storage depot. A new forklift truck joins the team, and Scoop shows her round the valley.|
| || Special|
US title (bottom)
|"When Bob Became A Builder"|
|While building a new parking lot, picnic area, and play area at the Beach, Bob and the machines tell Benny and Scrambler the story of how Bob and his dad Robert built the building yard in Bobsville, and how the machine crew we all know and love got together.|
- Farmer Pickles
- Mr. Beasley
- Mr. Bernard Bentley
- Mrs. Barbara Bentley
- Mr. Ellis
- J.J. (mentioned)
- Sumsy (Scoop Knows It All)
- Sandy Beach (Scrambler and the Colorful Cave)
- Sunny (While Bob's Away, Robert Will Play)
- Saffron (While Bob's Away, Robert Will Play)
|Project: Build It|