Moving House is the twelfth episode of the twentieth season. It was written by Helan Farrall.
When Mayor Madison wants to save an old historic house that is dangerously close to a crumbling cliff, Bob and the team lift it onto Two-Tonne’s flatbed to take it to a new site. Mr. Bentley accompanies the convoy and, being a keen bird watcher, he spots a nest of very rare eggs by the side of the road. To avoid disturbing it, Two-Tonne decides to take a different route through the city, but he misjudges the height of the bridge and the house gets stuck. Luckily Bob has a solution! He lets the air out of Two Tonne’s tires so the vehicle becomes low enough to squeeze under the bridge and move to the new site.