The two great wings of the castle were built around the middle of the 17th century following the traditional U-shaped French plan, featuring a central building behind the courtyard, which was enclosed with two wings, and surrounded by a moat.
The main building includes a gallery, probably built between 1598 and 1609, providing communication between the two wings, an unusual arrangement - where the central body serves as a link - reminiscent of the Château d'Écouen, and is probably the result of successive stages of construction.
This central body was rebuilt in 1738 and remodeled in the late 19th century by Boeswillwald, who has doubled in depth the garden side.
The axial pavilion was pierced in 1940 by a vaulted passage, somewhat anachronistic.

The wings are composed of three pavilions connected by an elongated body.
They are built of brick and stone, brick being used as a material following an approach that is also found in Château de Grosbois and the Château des Mesnuls.

It is possible that the main apartments were in the left wing and the servants or commons in the right wing.

In front of the central pavilion of the right wing, a bridge spanned the gap to provide access to the backyard.

The stables and important outbuildings were built in the early 18th  century, probably by brother Romain.

The chapel was in the left wing, accessible by a gallery on the ground floor in the alignment of the main building.

In 1703 it was replaced by an octagonal room, probably by brother Romain, but the Dreyfuses used another chapel according to Pringué.

The gallery that leads to the chapel dates to 1653.

This gallery-salon arrangement was repeated symmetrically in the right wing by Boeswillwald.

The building and its outbuildings were listed on the Inventory of Historical Monuments by order of 14 December 1979.
The two great wings of the castle were built around the middle of the 17th century following the traditional U-shaped French plan, featuring a central building behind the courtyard, which was enclosed with two wings, and surrounded by a moat. The main building includes a gallery, probably built between 1598 and 1609, providing communication between the two wings, an unusual arrangement - where the central body serves as a link - reminiscent of the Château d'Écouen, and is probably the result of successive stages of construction. This central body was rebuilt in 1738 and remodeled in the late 19th century by Boeswillwald, who has doubled in depth the garden side. The axial pavilion was pierced in 1940 by a vaulted passage, somewhat anachronistic.
The wings are composed of three pavilions connected by an elongated body. They are built of brick and stone, brick being used as a material following an approach that is also found in Château de Grosbois and the Château des Mesnuls.
It is possible that the main apartments were in the left wing and the servants or commons in the right wing.
In front of the central pavilion of the right wing, a bridge spanned the gap to provide access to the backyard.
The stables and important outbuildings were built in the early 18th  century, probably by brother Romain.
The chapel was in the left wing, accessible by a gallery on the ground floor in the alignment of the main building.
In 1703 it was replaced by an octagonal room, probably by brother Romain, but the Dreyfuses used another chapel according to Pringué.
The gallery that leads to the chapel dates to 1653.
This gallery-salon arrangement was repeated symmetrically in the right wing by Boeswillwald.
The building and its outbuildings were listed on the Inventory of Historical Monuments by order of 14 December 1979.
Château de Pontchartrain