What is significant? Haddon Hall, 405 Toorak Road, Toorak as designed by Robert B. Hamilton and constructed in 1931-2, is significant. The significant attributes are the Old English style form, materials and detailing of the flats, front and side brick fences, the garden setback to Toorak Road with semi-circular driveway. The high level of external intactness and wide range of decorative and quirky detailing that is typical of Hamilton including uniquely designed screen doors with inset panels, the bracket with name plate and light fittings etc. are integral to the significance of the place.
Later alterations and additions and the paving to the drivewayare not significant.
How is it significant? Haddon Hall is of local historic and architectural significance to the City of Stonnington.
Why is it significant? Historically, it is significant as one of the first examples of the Luxury flat type designed by Robert Hamilton and represents his prototype of maisonettes designed to resemble a large single-family home that he would use in his subsequent developments. Hamilton was a pioneer of maisonette developments, which were promoted as a practical alternative to a detached house and was the forerunner of the post-war townhouse. (Criteria A, D & H)
Architecturally, Haddon Hall is significant as a highly accomplished and externally intact example of inter-war flats designed in the Old English style. Details such as the fine brickwork and fachwerk, massive corbelled chimneys, and entrance gates with silhouette panels and lanterns, as well as its setting with a curved drive and original brick fence all contribute to its significance. Also for its association with Robert Hamilton, Victoria's foremost practitioner of the inter-war Old English style. (Criteria E, F & H)