New South Wales
In New South Wales, overshadowing regulations aim to limit the amount of shade new developments cast on neighbouring properties, ensuring that existing homes receive sufficient sunlight for their living areas.
Key Regulations
Sunlight Access
New apartment buildings must allow at least 3 hours of sunlight between 9 AM and 3 PM on the winter solstice to 50% of the Principal Private Open Space (PPOS).Shadow Diagrams
Shadow diagrams are required for new developments or extensions that may increase overshadowing.Winter Solstice
Policymakers focus on shadow diagrams for the winter solstice, when sunlight is most needed.
Ways to Reduce Overshadowing
Use reflective or light-coloured materials on building surfaces.
Incorporate green roofs or vertical gardens on taller buildings.
Design sun-shading devices such as louvres, overhangs, and brise-soleil.
Tips for Managing Overshadowing
Check with your local council or municipality.
Survey the situation.
Consult your neighbours.
Consider arbitration or mediation.
Keep records of all discussions, agreements, or disagreements.
Victoria
In Victoria, overshadowing regulations prevent buildings from blocking sunlight to neighbouring properties, applying to both new and existing buildings.
Existing Dwellings
A building cannot reduce sunlight to a neighbour’s recreational open space by more than 5 hours between 9 AM and 3 PM on September 22.
If sunlight to a neighbour's open space is already less than required, the new building cannot worsen the situation.
New Developments
Planning provisions protect solar power systems from overshadowing by new developments.
Local councils may limit the number of consecutive double-storey homes.
Setback Requirements
Setback regulations dictate how far a building must be from a neighbour’s property. For instance, a building may need to be set back by one metre, plus 0.6 metres for every metre above 3.6 metres but below 6.9 metres.
Building Permits
A building permit application that doesn’t comply with overshadowing regulations may require council approval.
Definition
Overshadowing occurs when a building or property casts a shadow on neighbouring properties.