Roxy hopes to see a passing comet as she heads to the observatory, but she must get around a long stairway which is too hard as she is a wheeled dog. The builder pups make a treehouse for a bunny who wants them to spend more time with him.
The Pupstruction pups assist a scientist whose laboratory keeps exploding. A silence-loving crustacean wants to keep an extroverted fish neighbor at bay, thus he seeks the service of Pupstruction.
Luna's hair has grown so long that it obstructs her sight. Phinny wants to make a Mother's Day gift for his Mom, but his colleagues need his help with their gifts.
Because the rollercoaster they built proved very popular, Pupstruction has to expand the parking places. While testing a machine, Professor Frazzle finds a dinosaur bone at the site, thus she calls Pupstruction to further the dig.
The Pupstruction crew must build a larger home for a canine family, but they must not disturb a next-door neighbor who's trying to sleep. A wannabe construction worker pits his team against the Pupstruction crew in a sand castle contest.
Phinny tries to impress Bailey on her birthday by building a roller coaster. Tank spends the rest of the night reading a cook book, thus he becomes out of focus when he and his fellow builders construct a restaurant.
The Pupstruction pups find themselves in a mission where they must stop a runaway ball with a hamster in it. Luna is addicted to digging, thus she keeps making holes in the ground in tasks that do not call for the action.
Bailey gets a splinter in her paw, and is afraid to have the doctor extract it. When Pupstruction receives an order to build a water park, a jealous Bobby disguises himself as a dog to enter the pups' HQ, and steal their blueprint.
Roxy teaches some demolition to Bailey who then takes a modified kick scooter on a wrecking rampage in the city. Harry is so conscious of the Pupstruction pups' safety, that his methods start affecting their work.
The smell of a dish kept too long inside Pupstruction headquarters is so strong that the construction pups have to demolish and rebuild the place. Phinny accidentally does some damage to his granny's dump truck, thus he tries to mend it.