State Significant Development
A development is considered to be State Significant Development (SSD) if it is over a specific size, is in an environmentally sensitive area, will exceed certain project cost thresholds or has been declared state significant development by the Minister.
Details on the criteria and the State Government’s SSD assessment process can be found here.
SSD applications are assessed by the State Government’s Department of Planning, Housing and Infrastructure.
Where to find State Significant Developments (SSDs) in Mosman and how to make a submission
SSDs are listed on the State Government’s Major projects web page.
To find SSDs in the Mosman Local Government Area, use the 'Local Council Area' filter - use the drop down arrow and select ‘Mosman Municipal' from the list, then click 'Apply filters'.
SSDs will be listed, with their address, a brief description and their current status. Select an application to see any published documents associated with the application. Generally, SSDs will be allocated a State Government Planner, and their name and contact details will be provided in each application’s project details.
The community are afforded an opportunity to provide comments on SSD applications at the public exhibition stage.
Submissions on State Significant Development applications must be made online through the NSW Planning Portal. Council cannot accept or lodge submissions on your behalf.
Instructions regarding how to create an account on the Planning Portal and lodge a submission can be found here. For more help making a submission, please contact Service NSW on 1300 305 695.
Undetermined State Significant Development Applications in Mosman
65 Muston Street
SSD number: SSD-98068713
Status: Department of Planning, Housing and Infrastructure preparing SEARs
Determination authority: State Government
Public exhibition: Public exhibition will occur when the applicant has submitted the Environmental Impact Statement
Summary of project: The proposal seeks to demolish all structures on site and construct a residential flat building under the low and mid-rise housing provisions with basement car parking and including in-fill affordable housing. The project is categorised as state significant development pursuant to Section 26A of Schedule 1 of the Planning Systems SEPP as it has an estimated cost of development of more than $75 million for the residential component and will provide at least 10% of the residential component as affordable housing for at least 15 years.
11-23 Rangers Avenue
SSD number: SSD-96272465
Status: Under Assessment
Determination authority: State Government
Public exhibition: Closed. The application, environmental impact statement (EIS) and accompanying documents were on exhibition from Thursday 4 December 2025 until Wednesday 17 December 2025
Summary of project: The environmental impact statement identifies that the SSDA seeks consent for:
- Demolition of the existing structures on the sites at 11 -23 Rangers Avenue and removal of the vehicular crossovers an Bloxsome Lane
- Removal of 21 trees
- Excavation to a depth of approximately 10m
- Construction of part 6, part 7-storey residential flat building comprising:
– 44 Residential apartments, including 10 affordable housing apartments to be managed by community housing provider Bridge Housing for a 15-year period (equivalent to 15% of proposed residential GFA proposed)
– Communal open space and associated site landscaping
– Two and a half levels of basement for 80 residential parking spaces and 11 visitor parking spaces as well as 12 bicycle parking spaces, 2 motorbike parking spaces with access form Rangers Avenue
– Storage, plant and essential services
– Level parking with car, bicycle and motorbike parking spaces, with waste storage areas and plant P0058845_EIS Introduction 17 - Vehicular access from Rangers Avenue, in the location of the current access (current vehicle access from Bloxsome Lane, including the removal of six existing crossovers)
- Rebuilding the existing sandstone retaining wall on the Rangers Avenue and retaining the existing rock wall
- It is confirmed that lot consolidation will occur as part of the future strata plan to be prepared and submitted for the project.
The project is categorised as state significant development pursuant to Section 26A of Schedule 1 of the Planning Systems SEPP as it has an estimated cost of development of more than $75 million for the residential component and will provide at least 10% of the residential component as affordable housing for at least 15 years.
Mosman Council’s objection to SSD-96272465 can be viewed here.
40-48 Redan Street
SSD number: SSD-93020230
Status: Applicant preparing Environmental Impact Statement
Determination authority: State Government
Public exhibition: Public exhibition will occur when the applicant has submitted the Environmental Impact Statement
Summary of project: The proposal seeks to demolish all buildings on site and construct a residential flat building under the low and mid-rise housing provisions with basement car parking and including in-fill affordable housing.
The project is categorised as state significant development pursuant to Section 26A of Schedule 1 of the Planning Systems SEPP as it has an estimated cost of development of more than $75 million for the residential component and will provide at least 10% of the residential component as affordable housing for at least 15 years.
494-516 Military Road
SSD number: SSD-93787211
Status: Applicant preparing Environmental Impact Statement
Determination authority: State Government
Public exhibition: Public exhibition will occur when the applicant has submitted the Environmental Impact Statement
Summary of project: The proposal seeks to demolish all structures on site and construct an eight-storey shop-top housing development with basement car parking and concurrent rezoning to change the zone from E3 Productivity Support to MU1 Mixed Use and amend the existing maximum height of building development standard to 29 metres and establish a new floor space ratio of 3:1 under the Mosman Local Environmental Plan 2012.
The project was declared as state significant development by the Housing Delivery Authority under the Minister’s State Significant Development Declaration Order 2025 (No 9) dated 13 June 2025.