The château was built in the 18th century on older foundations that cannot be precisely dated due to the current state of knowledge, and no visible elevations of the original structure remain.

The château changed owners at the beginning of the 19th century but experienced a period of stability and local prominence.

[1] Transformed into a textile factory for a quarter of a century and then abandoned starting in the 1970s, it was partially destroyed by two successive fires in March 2016.

At the end of the first quarter of the 21st century, the preservation of the building is uncertain, but the establishment of an active association offers hope that restoration work will take place.

[2] In the 19th century, the site of the château yielded polished stone axes dated to 4000 BC, which are preserved at the Baron-Gérard Museum in Bayeux.

[3] Opposite the château, Roman-era artifacts were found by Arcisse de Caumont, as well as remnants of buildings with painted frescos.

[8] The Saint-Ouen family sold the fief by auction in 1673; the buyer was Guy Chamillart, the intendant of the Caen generality.

[9] His son, Michel Chamillart, became a counselor in the Parliament of Paris in 1676, then the Controller-General of Finances in 1699, and Secretary of state for War in 1701.

[10] Michel Chamillart expanded the Magny estate through purchases in Ryes and exchanges with the King in Arromanches and Tracy.

[12] Nicolas-Joseph Foucault rarely visited Magny; the estate served as a repository for the results of excavations carried out in Vieux and Coutances.

In a legal battle against her husband over financial issues, the marquise obtained full ownership of the Magny land in 1719, although she never visited it.

[19] From 1731, the marquis was one of the "lieutenants of the king’s great venery," spending winters in Paris, particularly at the Hôtel de Magny acquired in 1758.

[23] On 17 January 1773, the château was sold to the lord of Courseulles, Marquis Pierre Charles de La Rivière, born in 1749 in Rouen and a soldier,[23] who probably commissioned a new interior decoration.

The estate passed into the hands of René Louis Gilles Hervé Clément Dubois de Littry on 22 January 1780, and he had only one child, a daughter, who died in childbirth in 1787.

[28] On 20 Messidor an II, the marquis's tombstone was damaged in the church, and the château's coat-of-arms decoration was removed.

[13] To the south of the château, the forecourt, moat, and main courtyard disappeared, as did the French garden to the north.

[38] Magny was liberated on the evening of 6 June 1944, by the 2nd Battalion of the Gloucestershire Regiment, the German troops having previously evacuated the building "as a matter of urgency".

[40][41]Following a report, a classification procedure was initiated on 16 November 1945, resulting in the chateau and grounds being listed on the supplementary inventory of historic monuments by decree on 31 May 1946.

[40] On 26 August 1949, a Belgian industrialist, Josef van Pamel, bought the estate and founded the Société linière de Magny.

[42] The château was transformed into a spinning mill, or more precisely a scutching plant (separating flax and hemp fibers).

[41][46] The couple seems intent on bringing the estate back to life by opening a museum dedicated to contemporary art.

[45] In 1989, the trees on the allée des évêques leading to Bayeux Cathedral were felled, "a gesture seen as a tragedy by many villagers" (Ouest-France, 18 March 2016).

[45]On the night of 16–17 March 2016, around midnight, a fire broke out in the north wing, destroying the roof structure and floors.

[13][48][49] The fire broke out in the south wing of the building, on the 1st floor or in the attic, possibly as a result of electrical shorts.

[45] The château was entered as a candidate for the Bern mission of the Heritage Lotto and selected in May 2018 from 269 buildings out of 2,000 applications nationwide.

[55] At the end of 2020, a first project costing €60,000 took place, subsidized by the Heritage Lottery, the DRAC, and the Departmental Council of Calvados.

Château de Magny once had "important buildings", as evidenced by traces of reused walls in the current construction.

[58] According to Hervé Baptiste, who questions this dating, the present château was built around 1728, and no texts have been preserved that mention the work.

Some of the walls of the old building have been preserved, as the client wished to correct the axis to make it coincide more closely with that of Bayeux Cathedral.