First of all, it is worth remembering that the village was for a long time the border of the Duchy of Savoy. The Canal de Savière was one of the main communication routes between Lake Bourget and the Rhône. Chanaz, the little Savoyard Venice is crossed by the canal on which many foodstuffs such as wine, spices, fabrics, etc. were transported.

In addition, some buildings still bear witness to this era today with mullioned windows. We can still see them on some facades. In addition, the Maison de Boigne, which currently houses the town hall, is an old fortified house dating from the 13th century. Also, it owes its name thanks to one of the former owners: the Lord of Boigne.

In an old Gothic chapel from the 15th century, is the Gallo-Roman museum of Chanaz. It brings together the remains of pottery made in Portout. Indeed, in the first half of the 5th century, the area was a high place of production of shiny ceramics. It is therefore a place where utilitarian crockery, jewellery, coins and other amphoras have been discovered. Ultimately, these productions were broadcast as far as Switzerland and the Mediterranean basin.