In 1344 the canal 'Haagse Trekvliet' was dug from The Hague city moats to the Vliet, which runs between Leiden and Delft.

[1] In 1936 and 1937 archaeological excavations took place at the site, probably in relation to making new foundations for the castle.

In a 1619 overview of Jacob II's accounts there is a reference to paying a mason for repairing the hill on which the house stood.

[2] Current knowledge about Binckhorst Castle still heavily relies on the work that Jaap Renaud did in the 1930s.

For Binckhorst to be a medieval building, the format of its bricks was too small, and the walls were too thin.

It depicts Binckhorst Castle as a simple construction consisting of a small house and a stair tower.

He concluded this was not a depiction of the medieval situation, which would be proven correct in subsequent excavations, but the predecessor of the core of the current building.

This depicted the long façade of the house, and the stair tower both facing the Trekvliet as they do today.

The house had a vaulted basement which reached to about 90 cm above the current ground level.

The simple foundations consisted of some rows of re-used kloostermoppen (medieval brick), upon which the new two-stone thick walls were erected.

On superficial inspection, these seemed to consist of a shallow layer of reused kloostermoppen (medieval brick).

The wall between III and IV had the same foundation, and was also made of red brick, this time of 19-20 * 9-10 * 4.5 cm.

[7] The 1614 picture by J. Londerseel is a bit off, but depicts the situation that part V has not yet been built, and that II and III had separate roofs[7] A sundial probably dated to 1616, and some archives allowed to date the construction of part IV to that year.

The brick in part IV was red with yellow veins, or sometimes vice versa., size 18 * 9 * 4 cm.

The rear wall of part IV was renovated later, and also showed a small brick of 16 * 7 * 3.5 cm.

A drawing by Roelant Roghman shows a building with three stepped gables, and part V still being lower.

[6] The windows in V and the tower were still later changes, probably by Marens de Jong in the late 19th century.

)[3] In 1308 the huys Binchorst was transferred to Count William III of Holland by Simon van Benthem.

In 1351, at the beginning of the Hook and Cod Wars, Binckhorst Castle was taken after a short siege.

[13] While Count William V was besieging the Binckhorst, his chamberlain bought 50 pieces of wooden plates.

[9] Joost Poes' only child Johanna married Knight Willem Snouckaert.

[16] In 1613 his friend Philibert van Borsselen the first Dutch poem dedicated to the owner of a landed estate.

In 1678 Willem van Nobelaer lord of Wissekerke married to Wilhelmina Snouckaert acquired the castle.

During the French period Binckhorst was bought by a Mr. Sanders, a shipping line owner.

[24] In November 1929 South Holland did not want to subsidize restoration, because the surroundings of the building no longer justified its preservation.

[25] In 1932 the very small National Socialist Dutch Workers Party had its headquarters at Binckhorst Castle, but this brought almost no activity.

By February 1935 it had been agreed to restore the castle as part of a youth employment program.

During the May 1940 Battle for The Hague three soldiers volunteered to try to reach the search light near Ypenburg airport from Binckhorst Castle.

[31] By 1958 the orphanage had left, and the foundation Vakopleiding Bouwbedrijf decided to take up residence in the castle.