The Gros-Plan house, known as the Maison Pettolaz, is a large, square, two-storey masonry building in the style of the Gruyère region, with a folded roof (a break in the slope of the roof) and a walled garden extending from the main façade. The high eaves feature a large chimney, indicative of the social and economic status of its first owner, François Pettolaz, whose initials appear on the decoration of the catellated stove dating from 1798. The original interior woodwork is intact.

François Pettolaz, at the height of his economic power, had just been admitted to the patriciate of Fribourg when he had this superb seigneurial-style residence built outside the hamlet of Le Pra. It was an achievement worthy of a powerful dynasty of cheese barons, the Pettolaz brothers and nephews, with a capital of 600,000 ecus around 1780 - at least 10 million francs today. In 1835, François Pettolaz also acquired the Château de la Corbettaz at the entrance to Charmey.

In collaboration with the municipality of Val-de-Charmey