In what houses did the aristocrats of the 19th century live?

The 19th century is a century when wood was already out of use, stone buildings were already the norm, iron was slowly being introduced. The aristocrats in different countries were different. Depending on the country, the condition of the aristocrats was different, which influenced their lives. Basically, the aristocrats of the 19th century had stone houses, but in some countries, for example, stone was not traditionally used, respectively, and their houses were not made of stone, but of some traditional material (for example, in Japan, traditional paper houses).