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The development application was lodged on 1 August 2025 and refused under delegated authority on 19 September 2025. Picton commenced the appeal on 29 October 2025 (para 11). The proposed change was not an application for a new dwelling. Alterations to an existing dwelling house were permissible in the R2 Low Density Residential zone (paras 12–13).

The appeal focused on the effects of the newly available views. Picton argued that the privacy impact on 21 Thompson Street would be negligible, because existing planting restricted views, most of the rear yard would not be visible, and the principal view would remain westward. He also argued the change would improve light and outlook in the living area at 4 Ruby Street (paras 9, 24–26). The Council argued that the neighbour’s backyard included private open space within 9 metres of the window, and that the proposed glazing would enable more sustained overlooking from seated positions in the living room (paras 10, 27–28).

The Court conducted a site view on 24 March 2026, including the interiors of both properties and the rear garden of 21 Thompson Street. A conciliation conference did not resolve the dispute, so the Court proceeded to a hearing (paras 3–4). The planning experts had prepared a joint report and were not examined in court. They agreed that lower-panel glazing would permit views towards the neighbour’s rear yard but disagreed about the privacy impact (para 22).

Acting Commissioner Macken dismissed the appeal. The dispositive point was not simply whether any view existed before the change. The Court accepted that the new view would not differ substantially from the existing standing views, but considered it material that clear glazing would allow views into part of the neighbour’s private open space from seated positions. The Court considered that this could create a more constant and non-negligible privacy impact (para 32). It found that the improvement in outlook came at the expense of the neighbouring property’s privacy and residential amenity (para 34).

Why the court decided this way

The Court first determined that the privacy provisions were relevant to the application. MLEP defined private open space as an external area, including land, a terrace, balcony or deck, used for private outdoor purposes ancillary to a building (para 29). The Court found that part of the private open space at 21 Thompson Street was within 9 metres of the subject window. It therefore treated the objectives and controls in MRDCP cl 5.7 as relevant (para 30).

MRDCP cl 5.7 states an objective of achieving adequate visual privacy for residents and neighbours. Control P1 addresses habitable-room windows with a direct sightline to nearby habitable-room windows or private open space within 9 metres. It identifies measures including offsetting windows, a sill height of 1.6 metres, or permanently fixed translucent glazing below that height (paras 18–19). The judgment also notes s 4.15(3A)(b) of the EPA Act, under which a consent authority is to be flexible in applying development control plan standards and allow reasonable alternative solutions that achieve their objects (para 20).

The Court’s focus was on the practical privacy effect, rather than a bare measurement between the buildings. The joint expert report gave the separation between the subject building and the neighbouring dwelling as approximately 14 metres. The Court nevertheless found part of the neighbour’s private open space fell within 9 metres of the window (paras 26, 30). Thus, for this assessment, the relevant distance was not only the separation between the buildings; the relationship between the window and the nearby part of the outdoor area also mattered.

The Court accepted part of Picton’s submission: the new view would not differ substantially from the standing view available to occupants before the alteration. But it distinguished a view available from standing from the opportunity for views while seated in the living room. It considered that seated viewing could make overlooking more constant and create a non-negligible impact (para 32). That finding explains why the Court did not regard the existing view as answering the privacy concern.

The Court also considered the proposed planting. Magnolia trees along the boundary might eventually provide screening, but the effectiveness of planting depended on climate and maintenance. On that basis, the Court did not treat future screening as assured (para 33). The reasons do not make a general finding that planting can never mitigate overlooking; they identify uncertainty about this planting’s eventual height and density.

The final assessment balanced the enhanced outlook at 4 Ruby Street against the privacy impact at 21 Thompson Street. The Court found the proposed outlook benefit came at the neighbour’s expense and concluded that the proposal had an unacceptable impact there (paras 34–36). The result is a fact-specific weighing of the view and privacy effects described in the judgment, not a stated categorical prohibition on glazing or on views across property boundaries.

There is an apparent drafting or citation inconsistency in the statutory discussion at para 35. That paragraph first says the proposal is contrary to s 4.15(1)(a)(i), referring to the MLEP aim of maintaining residential amenity. It then refers to s 4.15(1)(b), but links that provision to wording about local amenity and public and private views. Earlier, the judgment identifies that local amenity and views wording as an MLEP R2 zone objective (para 15), while it identifies MRDCP cl 5.7 O1 as the privacy objective (para 18). The reasons still state the outcome clearly, but the internal references in para 35 are not fully aligned with those earlier descriptions. This analysis does not substitute a different statutory classification.

Before and after state of the law

The judgment does not set out a comprehensive account of the law before the decision, nor does it purport to change the legal test for visual privacy. It identifies the planning instruments and statutory provisions considered in this individual appeal: the EPA Act, the MLEP, and the MRDCP (paras 14–20). It records that the MRDCP is relevant as a document providing guidance and that the consent authority is to be flexible in applying its standards, allowing reasonable alternatives that achieve their objects (paras 17, 20).

The principal judicial authority cited is Zhang v Canterbury City Council (2001) 115 LGERA 373; [2001] NSWCA 167 at [75]. The Commissioner cites it for the proposition that the question of adequate visual privacy under MRDCP cl 5.7 is entitled to significant weight in the decision-making process (para 31). The judgment does not set out the reasoning or broader holding in Zhang, so no further account of that case’s doctrine can be drawn from this text alone.

Nor does the judgment state that it changes the pre-existing law. Its contribution, as evidenced by the reasons, is an application of the identified planning considerations to a particular window, viewing position, nearby private open space and proposed planting. It illustrates that an existing standing view did not resolve the concern where the proposed glazing would permit views from seated positions and might make overlooking more constant (para 32). It also illustrates that planting was considered as a possible screen, but its uncertain effectiveness was relevant to the assessment (para 33).

The decision’s case-specific reasoning should therefore be distinguished from any claim that it establishes a universal distance rule or a new general test. The 9-metre figure appears in MRDCP cl 5.7 P1, and the Court found part of the neighbour’s private open space was within that distance (paras 19, 30). The judgment does not say that every view within 9 metres is unacceptable, or that a view beyond 9 metres can never affect privacy. It decides the appeal on its own findings and planning context.

Key passages with plain-English translation

At para 30, the Court finds that part of 21 Thompson Street’s private open space is within 9 metres of the subject window. In plain English, the fact that the buildings were about 14 metres apart did not dispose of the issue because the Court identified a closer relationship between the window and part of the outdoor area (paras 26, 30).

At para 31, the Commissioner says the question of adequate visual privacy is entitled to “significant weight”, citing Zhang at [75]. In plain English, privacy was not treated as a peripheral concern in this assessment. The judgment does not reproduce Zhang’s reasons, so this passage supports only the proposition for which the Commissioner cited it.

At para 32, the Commissioner accepts that the view from the altered window would not differ substantially from existing standing views, but identifies the added opportunity for overlooking from seated positions. In plain English, the Court considered not only what could already be seen, but how the changed window would affect the occupants’ ability to look into the neighbour’s private space during ordinary use of the living room.

At para 33, the Court says the Magnolia planting may eventually screen direct views, but its performance depends on climate and maintenance. In plain English, the possibility of future screening was not treated as certain enough to eliminate the privacy concern in the assessment.

At para 34, the Court states that the improved outlook was obtained at the expense of the neighbour’s privacy and residential amenity. This is the clearest statement of the balancing exercise. The Court accepted a benefit to the applicant’s property but considered the resulting impact on the adjoining property decisive.

At paras 35–36, the Court concludes that the proposal is contrary to the identified planning considerations, finds an unacceptable impact on 21 Thompson Street and dismisses the appeal. The references in para 35 to statutory paragraphs and planning objectives appear internally difficult to reconcile with the earlier descriptions in paras 15 and 18. The outcome itself is unambiguous.

What fact patterns trigger this precedent

The decision is most directly relevant, on its stated facts, where a development application proposes to alter a window so that a previously obscured or restricted portion becomes clear glazing; the affected view is towards a neighbouring area used as private open space; and at least part of that space is within 9 metres of the window. Those are the features that brought MRDCP cl 5.7 into the Court’s assessment (paras 2, 19, 29–30).

It is also relevant where the effect of an alteration is not limited to an existing standing view. Here, the Court distinguished existing standing views from the opportunity to overlook from seated positions in a living room, considering the latter capable of producing a more constant impact (para 32). The judgment may therefore be useful in analysing how viewing position and the ordinary use of a room feature in a privacy assessment, while remaining specific to the evidence before this Court.

The case also addresses a situation where proposed planting is advanced as a screening measure. The Court considered the likely effect of the Magnolia trees but noted that their eventual screening capacity depended on climate and maintenance (para 33). The decision does not establish that planting is inadequate as a general matter; it shows that its expected effectiveness was a relevant factual consideration here.

The case is less directly informative where the relevant area is not private open space, lies outside the stated 9-metre control, is screened by permanent structures, or where the proposal involves different sightlines and viewing positions. The judgment does not decide those scenarios. It also does not determine how a different development control plan, a different zone, or materially different evidence would affect the result.

How later courts have treated it

The supplied judgment contains no reference to later decisions applying, distinguishing, following, or otherwise treating Picton v Mosman Municipal Council. It was decided on 15 April 2026, and the text provides no subsequent procedural or citation history. Accordingly, later judicial treatment cannot be established from this source.

Within this judgment, the only identified case is Zhang v Canterbury City Council (2001) 115 LGERA 373; [2001] NSWCA 167. The Commissioner cites Zhang at [75] in support of assigning significant weight to the adequate-visual-privacy question (para 31). The judgment does not identify other authorities or explain how Zhang’s reasoning applies beyond that stated proposition.

For legal research purposes, the appropriate source-grounded statement is limited: this decision cites Zhang and applies the privacy provisions of the Mosman instruments to the particular evidence. The judgment itself does not establish that later courts have adopted its reasoning as a broader rule. Any account of later treatment would require sources beyond the judgment supplied here.

Still-open questions

The reasons do not explain in detail how the Court assessed the MRDCP flexibility provision in s 4.15(3A)(b). The judgment sets out that the consent authority is to be flexible and allow reasonable alternative solutions achieving the objects of DCP standards (para 20), but it does not separately analyse a particular alternative solution or explain why one was or was not adequate. That leaves the precise role of the provision in the final reasoning unstated.

The judgment identifies the neighbours’ private open space and a qualifying part within 9 metres, but does not provide a detailed measurement plan or describe the extent of the area that would be visible. It records the experts’ disagreement about the resulting privacy impact and the Court’s finding on that question (paras 22, 30–34). The reasoning therefore does not supply a quantified threshold for when overlooking becomes non-negligible.

The decision also leaves open how much weight should be given to proposed landscaping in other cases. Here, the Court noted uncertainty about climate and maintenance (para 33), but did not state what level of planting maturity, density, ownership, maintenance commitment or supporting evidence would be sufficient in another assessment.

Finally, para 35’s statutory and objective references are not entirely consistent with the earlier descriptions of the MLEP R2 objective and the MRDCP privacy objective. The judgment’s dismissal of the appeal is clear, but a reader seeking to identify the precise statutory limb for each planning consideration would need to examine the official judgment and relevant instruments. This analysis does not resolve that apparent inconsistency by importing material outside the supplied text.

This is general legal information, not legal advice. Zoe can make mistakes. Before acting on or relying on this analysis, have a qualified Australian lawyer check it.