Barbapapa is worried: the house built by Edmond and Jeanne is far too small now that Barbamama and the Barbabébé have arrived in his life. They need a new home! That's when François finds a charming mansion in the city, which will be perfect once it's repaired. The whole family gets to work and prepares to move in, but Mac Ravache, now an entrepreneur, decides to demolish it to build apartment buildings. Faced with this situation, the Barbapapa family leaves the city and discovers a wonderful corner of paradise in the middle of nature. An ideal place to build their new home together.