R-Codes Setback Requirements Explained
One of the most common questions I receive is about setback requirements under WA’s Residential Design Codes. Understanding these rules is essential for anyone planning a new home, extension, or renovation in Perth.
What Are Setbacks?
Setbacks are the minimum distances your building must be from property boundaries. They serve several purposes: protecting neighbour amenity, ensuring adequate light and ventilation, and maintaining streetscape character.
Primary Street Setback
For most residential zones (R20-R25), the deemed-to-comply primary street setback is 6 metres. However, this can vary based on:
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Your specific R-Code density
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Local planning policies
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Prevailing streetscape patterns
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Corner lot provisions
Side and Rear Boundary Setbacks
The R-Codes use a formula based on wall height and length. Key principles include:
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The taller and longer a wall, the further it should be from the boundary
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Walls with no windows to habitable rooms can be closer
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Walls up to 3.5m high and 9m long may be built to the boundary in certain circumstances
Building to the Boundary
You can build walls on the boundary if:
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The wall is behind the street setback line
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Maximum height is 3.5 metres (or 3.0m for the first 4.5m behind setback)
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Maximum length is two-thirds of the boundary
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There’s no major opening within 4 metres
Retaining Walls Count Too
Retaining walls over 0.5 metres high are treated as building walls for setback purposes. This is particularly important on sloping sites where significant retaining is required.
When Design Principles Apply
If your design doesn’t meet the deemed-to-comply provisions, you can still gain approval by demonstrating your design meets the design principles. This requires showing your proposal won’t negatively impact neighbour amenity.
Get Your Setbacks Right
Setback errors are one of the most common reasons for DA refusal. Contact me for a site analysis to understand what’s possible on your block.
Disclaimer: This article is provided for general information purposes only. Requirements and regulations may change, and specific circumstances vary. Always consult current legislation, your local council, and qualified professionals before making decisions about your project.