The Pittwater and Northern Beaches area was formerly inhabited by the Garigal or Caregal people in a region known as Guringai country.
European settlement Avalon was named after the mythical
Avalon, a legendary island in
Celtic languages mythology. According to legends, Avalon was an earthly paradise and the final resting place of
King Arthur. The first land grant in the area was to John Farrell in 1827. In 1833 a land grant was made to Australia's first Catholic priest,
John Joseph Therry, by
Governor Bourke. A further grant of 280 acres made in 1837 meant that Therry's holdings covered most of the peninsula from Newport to Whale Beach. He built a church in this area but his plans for a settlement never eventuated. After he died, the land was left to the Jesuit order and was then sold to help finance the rebuilding of
St Mary's Cathedral in Sydney. In the 1920s, the area was still known as 'Priest's Flat'. Arthur J Small handled a subdivision in 1921 and chose the name Avalon.
Careel House is a bungalow made of stone that was quarried in the area. Nowadays it is on the
Whale Beach side of the boundary. It is also heritage-listed.
Hy Brasil, located near
Clareville, was built in 1936, but was originally known as
The Gem. Later it was bought by Ted Herman, son of the painter
Sali Herman, who changed the name, using the name of a mythical island west of Ireland. It is heritage-listed. A sandstone cottage known as
Wickham, designed by
Walter Burley Griffin, was demolished with council approval in 1994. Another significant development was the creation of Ruskin Rowe in 1950. This street was designed as an estate by the architect Harry Ruskin Rowe, son of the architect
Thomas Rowe. Rowe created covenants to preserve the character of the estate, but they have been ignored to an extent over the years. Nevertheless, the estate is heritage-listed because of its historic significance, as well as its scientific significance in preserving the bushland environment of the area.
Early subdivision plans File:Avalon Beach Estate Plateau Rd, Park Reserve, 1921-1926.jpg|Avalon Beach Estate Plateau Rd, Park Reserve, 1921–1926 File:Avalon Beach Central Estate, Avalon Pde, Barrenjoey Rd, 1921-1926.jpg|Avalon Beach Central Estate, Avalon Pde, Barrenjoey Rd, 1921–1926 File:Avalon Beach Estates, Central Rd, Plateau Rd, 1921-1926.jpg|Avalon Beach Estates, Central Rd, Plateau Rd, 1921–1926 File:Avalon Sanctuary Estate, Park Ave, 1921-1926.jpg|Avalon Sanctuary Estate, Park Ave, 1921–1926 ==Heritage listings==