;Context: The headland projects out into Broken Bay forming its southern entrance. To the north is
Bouddi National Park along the Central Coast.
Lion Island and the northern shore of Broken Bay present a natural backdrop.
Ku-ring-gai Chase National Park defines the western side of Pittwater, with West Head as the most prominent topographical feature. In Broken Bay are three island nature reserves;
Lion Island, located just inside the entrance to Broken Bay and visible from Barrenjoey, was classified as a nature reserve under the National Parks and Wildlife Act 1967;
Long Island and
Spectacle Island reserves, dedicated in 1972, are located further inland and are important for their natural and cultural values. Palm Beach sweeps south of the Barrenjoey Headland. Further south, stretches of beach are framed by the various points and headlands. ;Aboriginal values: Barrenjoey Headland (part of Ku-ring-gai Chase National Park) occurs in the country of the Guringai people (Garigal Clan) who utilised the bushland, headland and shoreline for different purposes. Eight recorded Aboriginal sites appear on the NPWS Register for Barrenjoey Headland and Palm Beach. These sites include middens on the spit, sheltered campsites, and engravings. There are no known sites within the immediate vicinity of the lighthouse precinct, or proposed construction zones. A potential archaeological deposit (PAD) has been recorded at the top of the Smugglers Track. ;Buildings and structures: The principal buildings are the Lighthouse tower, Head Keeper's cottage, and Assistant Keepers' duplex with two semi-detached dwellings, associated outbuildings, boatshed and other site features. The three cottages are cut into the ridge behind the tower, giving protection against the prevailing north easterlies. This composition utilises a strong pattern of
sandstone retaining walls to define the front yards of the cottages and to link the main house to the tower. Barrenjoey is the only face sandstone tower in the NPWS collection. The tower is high and the focal plane of the light is above high water. It has a range of . The tower base is octagonal in plan to a height of and circular above. It is divided into three storeys with iron floors and staircases. The walls are thick at the base tapering to at the top. The gallery around the lantern is cantilevered on massive stone
brackets capped with elegant gunmetal
balustrade. A square oil room at the base of the tower is connected to the head keeper's cottage by a covered stair with a windbreak wall integral with both buildings. The Head Keeper's Quarters is constructed in sandstone, with timber floors and a pyramidal pitched roof of corrugated steel. The northwestern
facade has a
bay window flanked by
verandahs which return along to the southern facade. The bay looks into a
courtyard enclosed by sandstone walling. A covered way to the tower joins the verandah at the northeastern corner. The house is on two levels, with kitchen and service areas below and six rooms arranged around a central hallway above. The six rooms are currently set out as four bedrooms, storeroom and sitting room containing the north-facing bay window. Five fireplaces remain. A privy is also located at the southeastern corner of the lower level. The Assistant keepers' duplex is also of sandstone with timber floors. Each has four rooms about a hallway and the pair is symmetrical about a central party wall. Each cottage has a verandah, reached by stair on the north and connected by another stair to a service building at its rear. The main section features four rooms about a central hallway of sandstone, with timber floors. A single
hipped roof clad in corrugated steel
spans both dwellings. This building has been substantially rebuilt after being burnt. The internal walls have been completely stripped of their internal finishes. Joinery has been reconstructed and the rooms adapted to suit the occupants' lifestyle. A sandstone kitchen, store room and separate privy occupy the rear yard enclosed by a sandstone wall. Two underground water tanks are located in the space between the main building and the service structure. The timber-framed and
weatherboard clad Customs Station cottage has four main rooms about an open, west-facing verandah with several other rooms to their rear. It is built with a timber floor and colorbond corrugated roof. ;Lighthouse equipment The tower contains the diameter Chance Bros cast-iron-and-copper lantern house of segmental cast iron, copper-clad
dome and precast internal and external catwalks. It has diagonal pattern glazing system associated with fixed optics. The optic does not rotate on a chariot but sits on its original cast-iron main
pedestal. The optic glass is horizontally banded in "belts" and the centrally light is mounted on a smaller cast-iron pedestal. The Barrenjoey lens and pedestal are rare in Australia as being a
Chance Bros fixed optic light. Disused 1932 acetylene sun valve and flasher associated with the place are present in a stored condition. The light was converted to electricity in 1972. The light is still operational and is maintained as a navigational aid by the NSW State Government serving recreational boating in Pittwater. A disused 1932 acetylene sun valve and flasher associated with the place are present in a stored condition. ;Cultural landscape The foreground to the headland, when approached from Palm Beach, is the extensive Council car park. Access to the lightstation is by 4-wheel-drive road, by walking along Pittwater Beach and up the rough stone-flagged road to the summit or by walking the "smugglers trail". The summit forms a cultural precinct with the buildings nestled behind the trees on the rear face of the ridge. The timber cottage and boat
shed are located south west of the lighthouse complex, on Barrenjoey beach facing Pittwater. The cottage is associated with the Customs Station. A vegetable garden is believed to have been located to the rear of the timber cottages. A number of Coral trees presently surround this cottage and the boatshed adjacent. Lantana and privet also attest to European occupation. Otherwise, the vegetation is coastal heath, modified in the vicinity of the lightstation. A man-proof fence as protection against vandalism presently surrounds the lighthouse tower. The location of a flagstaff blown down about 1950 is indicated by eyebolts near the Trig Station. An earlier flagstaff (probably associated with the Stewart Tower) is shown on Barnet's 1877 plan and on a photograph. A memorial cairn/obelisk was unveiled in 1935 on the site of the Stewart Towers and named after P. W. Gledhill, a noted local historian. The two graves to the east of the tower are those of the first lightkeeper, George Mulhall, who apparently died when struck by lightning in June 1885, and of his wife Mary, who died the following year. The Gledhill Lookout Cairn is built from stone taken from the first lighthouse. Other features on the headland summit include the quarry, lookout markers and water tanks. At the rear of the houses and in front of the tower, random stone terracing was constructed. Remnants of a World War 2 concrete searchlight mount adjoin the Trig Station. Other defence-related features might be present.
Condition The lighthouse and main residence are intact. The Duplex is in a stable condition and adapted with loss of finishes following fire s. The property retains high integrity in the tower and head keeper's residence.
Modifications and dates The cottages were heavily damaged by vandals during the 1940s, following unmanning of the station and later leased by residents who have repaired and adapted the houses for their own use. The Australian Maritime Safety Authority also undertook basic maintenance. The boat shed was apparently constructed by the Nott family in the 1970s. It is a small timber-framed structure clad in asbestos cement sheet with concrete floor and corrugated colorbond roof. In 1972 the light was converted to electric operation from mains power with a backup emergency battery start generator. The original optical lens supplied by Chance Bros. of Birmingham is still in use today with a focal height of above sea level and a range of . == Heritage listing ==