The present Down (east) platform is the original and the station master's residence built in 1856 (at the north end) is the oldest building still in existence in the NSW railways system and probably Australia.

The concave veranda awning which flanks the building on the north and east elevations has recently been painted in a striped colour scheme (post 1980s).

The awnings to the rear have shallow pitched roofs, and the entire extent of the western additions, and a section to the original building, have now been enclosed to become interior spaces.

The link (which housed the ladies toilets) also originally had a gable roof, but with a much lower ridge height, giving the sense of it being a deferential element.

Modifications such as Perspex secondary glazing and air-conditioning units and standard ticket windows have been installed within the original openings.

The other major alteration at this time was the large openings to the north and west elevation of the parcels office (to the Crescent) and the installation of new aluminium framed doors and windows, in order that the space could be used as a travel centre.

[3] Internal: The building has been modified internally over time to suit changing operational requirements; however a good degree of original fabric remains intact, particularly in what is now the booking office, which features pressed metal ceilings with ceiling roses and original cornices, and chimney breast with staff mould detailing.

[3] The original building consisted of 3 rooms with a small toilet annex, with a flat roof, to the south-west corner.

[3] Internal: The current booking office has a modern fitout, including standard ticket window installation.

The buildings also includes a former ladies room (western end) and a kitchen fitout with new floor coverings, ceilings and cornices.

[3] The central room has original timber floors and plaster walls with staff mouldings on either side of the chimney breast.

The former parcels & booking office (eastern end) has original timber floors and plaster walls with staff mouldings on either side of the chimney breast and new skirtings.

The lean to at the back has fibre cement sheeting to the walls and ceilings with timber floors and the original doors and windows intact.

The surface of the footbridge was replaced recently with a tiled finish and the sides have been enclosed with frameless glass panels.

[3] The 2003 access upgrade included the installation of lift enclosures on both platforms which are located to the west of the footbridge and connected by a simple link.

A new canopy (c.1990) to the eastern end (in front of the Parcel Office extension) is constructed in steel to a detail loosely based on the existing awning to the heritage building.

[3] There is also a hipped roof shelter in front of the booking office and several canopies, to the same detail as above, over the waiting areas of the bus interchange.

The crane, which sits on a brick and tile base, is no longer used but remains as an ornamental element set within a garden bed.

[3] Based on the surviving documentation and the evidence on site it is unlikely there would be any potential archaeological remains at Fairfield Railway Station.

The 1880s platform building is relatively intact and despite additions and refurbishment, as well as operational changes, is representative of its historic form and has a high level of integrity.

The 1860s platform building is very intact and despite additions and refurbishment, as well as operational changes, is representative of its historic form and has a high level of integrity.

The Vine Street footbridge is in its original condition and despite its being a later structure, as it is intact maintains a moderate level of integrity.

It is also historically significant as the existing 1850s former station master's residence is the oldest surviving railway building in NSW and possibly Australia.

[3] Fairfield railway station was listed on the New South Wales State Heritage Register on 2 April 1999 having satisfied the following criteria.

[3] The place is important in demonstrating aesthetic characteristics and/or a high degree of creative or technical achievement in New South Wales.

Similarly the 1890s "Third Class Station Building" despite additions and alterations has most of its architectural features and details intact including the varied roof forms, the awning supported on original cast iron posts with Corinthian capitals and decorative cast iron brackets.

[3] The place possesses uncommon, rare or endangered aspects of the cultural or natural history of New South Wales.

The combined residence/office building is a relatively rare railway structure, with only three extant examples in the metropolitan network, the other two being at Riverstone and Emu Plains.

The Second Class platform building at Fairfield Railway Station has been altered considerably in terms of extensions to its south and west and new fitouts to its interiors but as it retains considerable amount of original fabric internally and externally and it has characteristic features of its this type of building and is a representative example.

[3] This Wikipedia article contains material from Fairfield Railway Station group, entry number 01143 in the New South Wales State Heritage Register published by the State of New South Wales (Department of Planning and Environment) 2018 under CC-BY 4.0 licence, accessed on 2 June 2018.