In the Paw Patrol series, Ryder often calls on the help of specific pups based on the needs of the mission at hand. If Ryder asked Marshall for Rubble and the builder pups to construct a fire station, it would likely be because the existing station needed an upgrade or repair to better serve their rescue missions.
The new fire station would provide better facilities for Marshall, the fire pup, and ensure that the Paw Patrol is equipped to handle emergencies efficiently. With Rubble's construction skills and the builder pups' teamwork, they could design a station that meets all the requirements for the Paw Patrol's operations while being safe and functional for fire rescues. This scenario emphasizes teamwork, problem-solving, and the importance of being prepared for rescue missions.