In early the 19th century the castle came into the hands of Louis Napoleon who filled up the moat.

After the return of the house of Orange-Nassau to the Netherlands in 1813 Het Oude Loo became the property of king William I.

Queen Wilhelmina of the Netherlands had the castle and the moat restored by architect Pierre Cuypers.

[4] On 21 March 2022, it was announced that the property would be used to house 20-30 refugees fleeing the 2022 Russian invasion of Ukraine.

[5][6] The gardens of the castle have a statue pond, a maze made out of beech trees, and an outdoor bowling alley.