Boagreggan is important as part of the social, architectural and development history of Oak Bay. It is significant as one of only 12 homes built in the pre war phase of the Uplands development. Balgreggan is part of a distinct subdivision designed by North America's leading landscape architect, John Charles Olmsted. Olmsted's vision was to design the Uplands subdivision as a “residential park” to harmonize with the natural environment. True to his vision, Bolgreggan and its grounds create an atmosphere for all to enjoy.

Built in 1914, the architectural value of Bolgreggan lies in its first-class design attributed to the Calgary architect Charles Hay, and was featured in a promotional brochure on the Uplands (c.1920). This mansion is notable as a landmark because of its large scale and prominent location. The symmetrical composition enriched with classical detail creates a distinctive building within the Georgian Revival style. This large scale home, built with quality detailing and spacious interiors reflect the social status of the original owner, successful businessman, John Turner, of J.A. Turner and Co. Real Estate.

The following information is a repeat from the statement of significance on Valrose at 3125 Uplands, and will be part of the statement of significance on the Uplands district. One of only 12 homes (plus the Yacht club) built in the pre war phase of the Uplands development - a distinct subdivision designed by North America’s leading landscape architect, John Charles Olmsted (son of the foremost American landscape architect, Frederick Law Olmsted) - Bolgreggan helped to set a high standard for the subsequent development of Uplands’ residential architecture. The property is also important as part of the Hudson’s Bay Company Uplands Farm, which was substantially subdivided leading up to the pre-war building boom in Oak Bay. An option to purchase the land from the HBC was taken out in 1907 by a syndicate headed by William Hicks Gardner.