[2] The 18th-century Adam style interior of the stone building was devastated by fire in 1929, but has now been restored and serves as a museum.

In 1607 Viscount Bindon wrote to Robert Cecil, 1st Earl of Salisbury, crediting him with the origins of the design:"If this little pile in Lulworth Park shall prove pretty or worth the labour bestowed in the erecting of it, I will acknowledge, as the truth is, that your powerful speech to me at Bindon laid the first foundation of the pile in my mind, which ever since has laboured for a speedy finishing for the contentment of those for whose further liking of that place the care is taken".

William struggled with near insolvency, but partially rescued the estate finances by ensuring his son, Humphrey III (died 1722), married well into the Simeons family.

Humphrey was succeeded by their son, Edward Weld (Senior) who had the means to decorate the interiors of the castle, build extensions and lay out the grounds, despite personal legal difficulties he managed to overcome.

Thomas and his wife Mary produced fifteen children, most of whom survived, and together with their descendants were able to retain Lulworth as the family seat into the 21st century.

[9] Thomas Weld built a Roman Catholic church dedicated to St. Mary to serve as the family chapel in the grounds of the castle in 1786.

[11] The next episcopal consecration took place there on 19 December of the same year when John Douglass was consecrated bishop of The London District (which included the home counties, the West Indies with the exception of Trinidad, and the Channel Islands of Jersey and Guernsey) by William Gibson, titular bishop of Acanthus, and Vicar Apostolic of the Northern District.

[12] The castle was gutted by fire on 29 August 1929[13] and was left as a roofless ruin, the family building a new residence for themselves nearby.