Narellan Creek redeveloped in stages as residential suburb named Harrington Park Estate. Stage two of this extends north of Narellan Creek. 1997 a proposal for an altered curtilage around the homestead was rejected by Camden Council. The following modifications have been made to the Harrington Park homestead: 1817 – Original single storey cottage, now kitchen wing 1825 – Single pile 2-storey section of homestead to south of original cottage. 1830 – Bow front to homestead's northern elevation and dining room 1860 – Verandah modifications 1890 – Verandah changed to cast iron posts etc. and ogee roof, roof shingles replaced with corrugated iron 1930 – Sunroom to north-west elevation 1955 – Alterations and additions including west kitchen additions, verandah (front terrace) 1967 – Master bedroom and retreat to north-eastern end /elevation of homestead The following modifications have been made to the garden structures: – Studio (Billiard) ( converted cottage) 1957 – Garden Study – Nursery established west of house 1967 two pavilion style rooms (master bedroom and retreat) added to the northern side of the house by architect Marcel Weyland. The following modifications have been made to the garden: by 1852 a race course established between the house and Narellan Creek. At that time the estate comprised 800 acres of cleared land, pasture and forest with crop paddocks and a vegetable garden near the house. 1850s–60s Davy planted many mature coniferous and other trees most likely after 1853, including Araucaria bidwillii (Bunya Bunya pines) and A.cunninghamii (hoop pine) and Cupressus sempervirens (Mediterranean cypress). Other major modifications include: 1890s major house renovations occurred and a new drive created that passed an ornamental pond and entered through a picket-fenced gateway to the garden on the east of the house. A number of tall shrubs in the garden bed next to the verandah were removed at this time. Pedestals were added at the foot of the verandah steps. an aerial photograph (transfer to the Fairfax family) shows the garden as having a defined southern edge with the garden extending east over part of the area shown as garden (kitchen/vegetable garden) and gardener's house on the 1842 map. The racecourse was no longer clear but the cleared alluvial flats were still cleared. Heritage listing As at 11 November 2005, Harrington Park is of State significance as one of the earliest "Cow Pasture" homesteads on the Cumberland Plain. Harrington Park forms part of a grant to