What is a Shadow Diagram?

Short answer

A shadow diagram shows how a proposed development will cast shadows on neighbouring properties and public spaces at specific times of the day and year.

Full answer

Shadow diagrams are required by councils to illustrate the impact of a development on sunlight access. They typically model shadows during key times (9am, 12pm, 3pm) on both the winter and summer solstices. These diagrams help assess whether a building design complies with planning rules on solar access, overshadowing and amenity for neighbours.

Why this matters

Accurate shadow diagrams prevent delays in council approvals and reduce disputes with neighbours. Incorrect or misleading diagrams can cause rejections or redesigns.

How Certified Energy can help

We prepare accurate, compliant shadow diagrams using 3D modelling and planning tools. Our experts ensure your diagrams meet council requirements and reduce approval risks.

Related regulations

• NSW Environmental Planning and Assessment Act

• Local Council Development Control Plans (DCPs)

• SEPP (State Environmental Planning Policies) on solar access

Helpful resources 

• When is a shadow diagram required?
• How much do shadow diagrams cost?
• What should be included in a shadow diagram?
• How do shadow diagrams affect DA approvals?