There are four primary building structures located on the property. Each building is constructed of a combination of brick, concrete and timber. Other structures includes two swimming pools located on the property, the first located in front of Linnwood Hall, the second immediately behind McCredie Cottage. Both are covered with sheet iron supported by a timber structure. As at 6 March 2002, historic photographs show intensively developed grounds with ornamental flower beds, statues, fountains and gravel drives or paths. Because most of the old garden area is now covered by lawn, it is likely to have been little disturbed and therefore has high archaeological potential to retain evidence of the early landscaping. Areas within the main building which are likely to have archaeological potential include underfloor and foundation areas, wall cavities and roof spaces. Where deposits have not been removed by subsequent disturbance or misadventure (building works, repairs, etc.) they may be expected to yield information relevant to the original construction and occupation of the building. Many early tree plantings (including Araucarias, camphor laurels), garden layout (including entrance drive, and garden features such as outbuildings, an iron fountain, iron railing fence to street), large plantings (such as giant bamboo) remain, along with later plantings from the 20th century such as a grove of eucalypts along the entrance drive. Such a relatively intact large urban garden retaining early structure, plantings and detail is increasingly rare today. The fencing which borders most of the property is considerably deteriorated and the property generally has been poorly maintained in recent years. The main gate posts remain although their paint is peeling off and in poor condition. Much of the building and curtilage are intact. Grounds include many original elements. Modifications are reversible. The main residence has been adaptively re-used over many years to provide institutional care facilities for live-in clients of the Department of Community Services. There has been some intervention in original fabric of the residence, however, it is not irreversible. On 17 March 2011 the Minister approved creation of two Crown Reserves over the Linnwood Hall Estate. One contains all buildings and heritage cartilage and will be managed by Holroyd Council. The other covers the open space fronting Tamplin Road, will be managed by the Land and Property Management Authority (LPMA). As at 14 November 2007, Linnwood, including its associated buildings and landscape, is of state significance as a welfare site that was in operation and use for over 80 years.