Does a development need to protect sunlight to a neighbour’s living-room windows?
Yes. The design needs to consider how much sunlight neighbouring homes will continue to receive, particularly to their main living areas.
Some additional overshadowing may occur as a result of development. The requirement is for reasonable solar access, rather than guaranteeing that a neighbour’s living-room windows will receive exactly the same amount of sunlight as before.
For residential development, one of the main controls used to protect neighbouring solar access is the solar building envelope. It limits the building form in relation to the northern boundary of an adjoining residential block.
Example: If a proposed dual occupancy is immediately north of an adjoining house, its height and position may need to be designed so that it complies with the applicable solar building envelope and provides reasonable solar access to the adjoining dwelling.
Reference: Residential Zones Policy – Assessment Outcome 15 – Territory Plan 2023 | Notifiable instruments
Short Answer
Yes. A residential development in the ACT needs to provide reasonable solar access to dwellings on adjoining residential blocks, including their main living spaces. However, this does not mean every neighbouring living-room window must remain completely unshaded. The proposal is assessed against the applicable solar-access provisions, including the solar building envelope.
Detailed Explanation
The applicable residential planning framework establishes Assessment Outcome 15, which requires:
“Reasonable solar access to dwellings and private open space within a block and on adjoining residential blocks…”
Importantly, the Assessment Outcome expressly states that this includes solar access into main living spaces within a dwelling.
The associated Residential Zones Technical Specifications provide a measurable benchmark through the solar building envelope. Under Specification 15.1, buildings are generally required to be located wholly within an envelope projected at 31° to the horizontal from the prescribed height of the solar fence along any northern boundary of an adjoining residential block. The applicable solar-fence height varies according to the development and block type.
Therefore, the planning requirement is not framed as an absolute right to sunlight through every individual living-room window. The assessment considers whether the development achieves reasonable solar access to the adjoining dwelling and its private open space, including its main living spaces, having regard to the applicable Territory Plan provisions.
No minimum block size does not remove the need for planning assessment.
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