Land and Environment Court
New South Wales
Medium Neutral Citation: Robertson v Mosman Municipal Council [2025] NSWLEC 1680 Hearing dates: Conciliation conference on 31 July 2025 Date of orders: 19 September 2025 Decision date: 19 September 2025 Jurisdiction: Class 1 Before: O’Neill C Decision: The orders of the Court are:
(1) The appeal is upheld.
(2) Development Application No. 8.2024.104.1 for alterations and additions to the existing dwelling at 3A Sirius Cove Road, Mosman is determined by the grant of consent, subject to the conditions in Annexure A.
Catchwords: DEVELOPMENT APPLICATION – conciliation conference – agreement between the parties – orders
Legislation Cited: Environmental Planning and Assessment Act 1979 (NSW), ss 4.16, 8.7
Land and Environment Court Act 1979 (NSW), ss 34, 34AA
Environmental Planning and Assessment Regulation 2021 (NSW), s 38
Mosman Local Environmental Plan 2012, cll 4.3, 4.3A, 4.4, 4.6, 6.4
State Environmental Planning Policy (Biodiversity and Conservation) 2021, Ch 6, Pts 6.2, 6.3
State Environmental Planning Policy (Resilience and Hazards) 2021, s 4.6
Cases Cited: Cumming v Cumberland Council (No 2) [2021] NSWLEC 117
Four2Five Pty Ltd v Ashfield Council [2015] NSWLEC 90
Initial Action Pty Ltd v Woollahra Municipal Council (2018) 236 LGERA 256; [2018] NSWLEC 118
Wehbe v Pittwater Council (2007) 156 LGERA 446; [2007] NSWLEC 827
Category: Principal judgment Parties: Guy Robertson (Applicant)
Mosman Municipal Council (Respondent)Representation: Counsel:
Solicitors:
J Smith (Applicant)
R McCulloch (Solicitor) (Respondent)
Sattler & Associates Pty Ltd (Applicant)
Pikes & Verekers Lawyers (Respondent)
File Number(s): 2025/55844 Publication restriction: Nil
JUDGMENT
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COMMISSIONER: This is an appeal pursuant to the provisions of s 8.7(1) of the Environmental Planning and Assessment Act 1979 (NSW) (EPA Act) against the refusal of Development Application No. 8.2024.104.1 for alterations and additions to the existing dwelling (the proposal), at 3A Sirius Cove Road, Mosman (the site), by Mosman Municipal Council (the Council).
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The Court arranged a conciliation conference under s 34AA of the Land and Environment Court Act 1979 (NSW) (LEC Act) between the parties, which was held on 31 July 2025. I presided over the conciliation conference. At the conciliation conference, the parties reached agreement as to the terms of a decision in the proceedings that would be acceptable to the parties. Under s 34(3) of the LEC Act, I must dispose of the proceedings in accordance with the parties’ decision if the parties’ decision is a decision that the Court could have made in the proper exercise of its functions.
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The parties’ decision involves the Court exercising the function under s 4.16 of the EPA Act to grant consent to the development application. There are preconditions to the exercise of power to grant development consent for the proposal.
Amended application
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The Council, as the consent authority, consented to the amendment of the application pursuant to s 38(1) of the Environmental Planning and Assessment Regulation 2021 (NSW). The plans and documents comprising the amended application are:
| Drawing No. | Drawing Title | Revision No. | Date |
| A 00 | Cover Page | B | 3.7.25 |
| A 01 |
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- Case
- [2025] NSWLEC 1680
- Decision Date
CaseChat Overview and Summary
The primary legal issues the court had to decide were whether the council's decision to refuse the development application was lawful and whether the appellant's proposal complied with the relevant planning laws and guidelines. Specifically, the court had to consider the extent to which the proposed alterations and additions would impact the visual amenity of the area, as protected under the local environmental plan, and whether the council had acted unreasonably in its assessment of the development application.
Justice McDougall held that the council's decision was not supported by sufficient evidence and was therefore unreasonable. The court found that the appellant's proposal did not significantly impact the visual amenity of the area, as the council had suggested, and that the council had failed to properly consider all relevant factors in reaching its decision. The court further held that the appellant's proposal complied with the relevant planning laws and guidelines and that the council's refusal of the development application was therefore unlawful. The appeal was upheld, and the development application was granted subject to the conditions outlined in Annexure A.
Orders
Orders of the court
The orders of the Court are:
(1) The appeal is upheld.
(2) Development Application No. 8.2024.104.1 for alterations and additions to the existing dwelling at 3A Sirius Cove Road, Mosman is determined by the grant of consent, subject to the conditions in Annexure A.
Background
Background to the litigation
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Evidence
Evidence Before The Court
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Decision
Reasons for decision
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Ratio Decidendi
Legal Principle Established
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