Something that's Victorian existed during the time that Queen Victoria ruled Great Britain. If your house is Victorian, it was built in the 19th century.
Queen Victoria was the reigning monarch of Britain from 1837 until 1901, and things that were created, designed, or written then can be described as Victorian, especially if they're related to the popular style or standards of the time. There is Victorian art, architecture, and literature, and there are also typically uptight Victorian values and attitudes. To describe someone as Victorian these days means to criticize them as prudish or old fashioned.