Loggan Rock, Heritage house in New South Wales, Australia

Loggan Rock is a two-storey log cabin with a stone tower at 111 Whale Beach Road, Avalon Beach. Alexander Stewart Jolly designed the Californian Bungalow cabin, completed in 1931, and added the stone tower in 1934; Max Collard designed a modern extension in 1953.

The land was part of John Joseph Therry's 1837 grant of 113.31 hectares. In 1928 Harold Kent bought Lots 179 and 180, and Alexander Stewart Jolly built the log cabin there for film censor Lionel Hurley, completing it in 1931; a stone tower followed in 1934. Hurley only gained legal title in 1937, and the property passed to sculptor John Bonar Dunlop in 1950.

The house is also known as Cabin Avalon and Log and Rock, names tied to its log-and-stone construction. Alexander Stewart Jolly built it from 1929 as a holiday cabin for his friend Lionel Hurley, a film censor, who only gained legal possession of the land in 1937 after consolidating Lots 176 to 180. The stone tower was added in 1934.

The building is a heritage site that can be viewed from the outside, with the facade and structure clearly visible. Visitors gain the best understanding by walking around the property to see all sides of the original construction.

The house is also known as Cabin Avalon and Log and Rock. Its stone tower, added in 1934, holds a laundry and bathroom on the lower level and two bedrooms above, while the 1950s kitchen, dining and lounge rooms were added by the sculptor John Bonar Dunlop and his wife Hilary, a dancer with the Bodenweiser Dance Company.