Near the beginning, Vincent Price's character mentions that his companion at the hunting lodge had the house built. Later in the film this fact is mentioned again. That means the house was nearly new--built in the 1950s or 1940s at the earliest. Yet it appears to have been built in the 19th century.
shareVincent Price (1911-1993) who played Dr. Wells should have been about 48 when his scenes were filmed.
Was Well's companion at the Hunting Lodge seen during the filme? If the companion was only talked about, he could have been someone who died of old age decades ago.
Was the date mentioned or seen in the film? Possibly the visual aspects were consistent with it happening a few years earlier than 1959.
Possibly Dr. Wells was older than he looked. Possibly when Dr. Wells was at the hunting lodge age 20, his companion was aged 70 and had built the house 40 years earlier. That would make the house built about 70 years before about 1959 or earlier, in the 1880s or 1890s.
If Dr. Wells' companion is seen in the film or mentioned as being alive during the film, he should have built the house in the 1950s or 1940s or possibly the 1930s.
Here is a link to an article about Mystery Castle built in the 1930s:
https://en.wikipedia.org/wiki/Mystery_Castle
Here is a link to an article about the castle like mansion Glencairn completed in 1938:
https://en.wikipedia.org/wiki/Glencairn_Museum
Here is a link to an article about Bishop Castle, built over decades beginning in the 1960s:
https://en.wikipedia.org/wiki/Bishop_Castle
Here is a link to an article about Rubel Castle built 1n 1959 to 1986:
https://en.wikipedia.org/wiki/Rubel_Castle
Here is a link to an article about Bull Run Castle built 1986-1996:
https://www.onlyinyourstate.com/virginia/bull-run-castle-hidden-va/
Here are links to an article about Pensmore, a chateau like mansion completed in 2016.
https://en.wikipedia.org/wiki/Pensmore