The original, still wooden chapel of St. Nicholas was built in the early twenties of the thirteenth century, but was destroyed during the uprising of the Ests. It is possible that it was built on a pagan place of worship. The present building dates back to the beginning of the 15th century. Its creation may be related to the monastery of Saint Bridget in Tallinn, because the Saha chapel seems to be a smaller version of that convent. The chapel was damaged during the Great Northern War in the early 18th century. A thorough renovation was carried out in the years 1962-1969.
The shape of the chapel is unusual, because it was not erected on the plan of a rectangle, but a rhomboid. All the walls are reinforced with small buttresses, both south and north with two ogival windows. Single windows and small openings in the attic are also located from the east and west. In the north – west corner there is a turret, which stairs leading to the attic. This gives the chapel a defensive character. The interior has groin vaults.