Flood Risk in Hornsby, NSW

Is my Hornsby property in a flood planning area?

Hornsby Shire Council has flood planning areas defined under the Hornsby LEP. Berowra Creek, Cowan Creek, and their tributaries are the main flood risk areas on the northern edge of the shire. Suburban areas closer to the train lines generally have lower flood risk.

Which Hornsby suburbs have flood risk?

Flood risk in Hornsby Shire is most pronounced near Berowra Waters, Cowan, and low-lying areas along creek lines through suburbs like Hornsby, Waitara, and Asquith. Use the checker above to confirm whether your specific address is within the mapped flood planning area.

Does flood zone status affect development approvals in Hornsby?

Yes. Properties in Hornsby's flood planning areas face additional development controls. Minimum floor levels above the flood planning level, flood-compatible materials, and formal flood risk assessment may all be required depending on the type of development proposed.

Can I build a granny flat on a flood-affected Hornsby property?

Under SEPP Housing 2021, flood control lots cannot use the complying development pathway. If your Hornsby property is in the flood planning area, a secondary dwelling requires a DA. Check your full SEPP eligibility using the granny flat checker after confirming flood status above.