What should be included in a shadow diagram?

Short answer

A shadow diagram must include the proposed building, surrounding context and shadow projections at key times of day during both summer and winter solstices.

Full answer

To be accepted by councils, a shadow diagram should show:

• Existing and proposed structures

• Impact on neighbouring dwellings and outdoor spaces

• Shadow cast at 9am, 12pm, and 3pm on 21 June (winter solstice) and 21 December (summer solstice)

• Orientation with a clear north point

Accuracy is critical and diagrams must be drawn to scale and based on correct survey data.

Why this matters

Incomplete or inaccurate diagrams can result in costly redesigns or DA refusal. Councils rely heavily on these diagrams to determine planning compliance.

How Certified Energy can help

We prepare detailed, fully compliant diagrams using the latest software and survey data, ensuring your project meets solar access standards.

Related regulations

• Local council DCP solar access provisions

• NSW Apartment Design Guide

• Environmental Planning and Assessment Regulations

Helpful resources 

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