Glossary
Permeability
Written and verified by Struqt’s registered architects · Last verified July 2026
The proportion of the lot that must remain unsealed (lawn, garden, gravel) so rainwater can soak into the soil. Common minimum: 20%–35% of site area, depending on zone.
What it means for what you can build
Permeability rules reserve part of the lot for soft landscaping, which competes with footprint, driveways and paving when you're laying out a site.
Related terms
See this on your own property
Run any Australian address through Struqt to see whether permeability applies to your block — and what it means for what you can build.