Campbell House is the oldest remaining house from the original site of the Town of York. Built in 1822 by Judge William Campbell and his wife Hannah, the home was designed for entertaining and comfort, and constructed at a time when the Campbells were socially and economically established and their children had grown to adulthood.

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The house is one of the few surviving examples of Georgian architecture left in Toronto. Campbell House is constructed in a style in vogue during the late Georgian era known as Palladian architecture. This style was Italian in origin, and based upon elements of classical Greek and Roman architecture, which emphasized symmetry of features (windows, fireplaces, doors etc.) and grandiose proportions to exhibit wealth.