It now serves as a residence for Vallø stift, a home for unmarried, widowed and divorced women of noble descent.

In 1708 Vallø was acquired by King Frederick IV who passed it on to Anne Sophie Reventlow.

In 1731 King Christian VI passed the property on to Queen Sophia Magdalene who in 1737 founded the Noble Vallø Foundation for Unmarried Daughters (da.

In Christen Skeel's time of ownership, from 1638 to 1659, the castle was expanded to three storeys and the west wing extended.

The castle was devastated by fire in 1893 but restored largely to its old design by Hans Jørgen Holm between 1893 and 1904.