Does vegetation on adjoining land affect the development assessment?
Yes, neighbouring vegetation can affect the assessment if your development could impact it.
A tree does not have to be located within your block for it to be relevant. For example, if a large tree is located just inside your neighbour’s property but its tree protection zone extends into your proposed excavation or building area, the tree may need to be identified and appropriate protection measures considered.
This does not mean that every tree or plant on neighbouring land will affect the DA. It becomes relevant where there is a potential interaction with the proposed development, such as construction impacts on a protected tree or broader environmental impacts that need to be assessed. ACT Planning considers the probable environmental impacts of a development and its relationship with the site surrounds.
Reference: Planning (Minimum Development Application Documentation) Guideline 2026 (No 1) (NI2026-13) Tree Management Plans
Short Answer
Yes, it can. Vegetation on adjoining land may be relevant where it could be affected by the proposed development or where it forms part of the site's environmental or landscape context. In particular, trees on adjoining properties must be considered where their tree protection zones could be impacted by the works.
Detailed Explanation
The Minimum DA Documentation Guideline provides a particularly direct requirement for adjoining trees. Under its requirements for Tree Management Plans, the plan must identify:
trees on adjoining properties and unleased land where the tree protection zone will be impacted by the works.
The guideline also requires the Tree Management Plan to address relevant protection measures and construction activities, including demolition, building works, service installation, access, equipment use and tree protection fencing.
This is supported by ACT Planning's DA assessment framework. During assessment, the Territory Planning Authority considers the suitability of the development in the context of the site and surrounds and its probable impacts, including environmental impacts.
Example: If an adjoining property's protected tree has a tree protection zone extending onto the development site and the proposed building excavation enters that zone, the adjoining tree may need to be shown and addressed in the relevant arborist documentation or Tree Management Plan.
Therefore, vegetation on adjoining land does not automatically constrain a development simply because it is nearby; its relevance depends on whether the proposal could affect it or whether it is otherwise relevant to the applicable planning assessment.
No minimum block size does not remove the need for planning assessment.
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