[1] As at 23 November 2000, 90–92 Windmill Street is part of the Millers Point Conservation Area, an intact residential and maritime precinct.

Of historical significance as physical evidence of the development of the area with a diverse range of terrace style housing in the mid-late 19th century.

[1][5] 90–92 Windmill Street, Millers Point was listed on the New South Wales State Heritage Register on 2 April 1999 having satisfied the following criteria.

Of historical significance as physical evidence of the development of the area with a diverse range of terrace style housing in the mid-late 19th century.

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

[1] The place has potential to yield information that will contribute to an understanding of the cultural or natural history of New South Wales.