[1][2][3] The first building on the site was a medieval house built by the Gren family in the fifteenth century.

[4][5] The present castle at Tidö was built by the influential statesman and Lord High Chancellor Axel Oxenstierna in 1625–1645.

The castle was built around a rectangular courtyard with the main building to the north and the three linked wings to the east, west and south.

Tidö is one of Sweden's best preserved Baroque palaces, in the Dutch Renaissance style.

Following the 2022 Swedish general election the leaders of the 4 right wing parties, Ebba Busch from the Christian Democrats, Johan Pehrson from the Liberals, Ulf Kristersson from the Moderate Party, and Jimmie Åkesson from the Sweden Democrats gathered at the castle to negotiate the Tidö Agreement.