What are tunnel protection measures?

The T2D tunnels will run underneath the existing South Road corridor, but in some sections, they will run underneath privately owned properties – at depths of around 10m to approximately 30m below the surface.

Before tunnelling works start, we need to put measures in place to protect the integrity and ongoing operations of the new tunnels including:

  • Code Amendment to the State's Planning and Design Code
  • Well construction permits.

This project will deliver the first major transport tunnels for South Australia, which is why these new measures are required.

Code Amendment

We are seeking to amend the State's Planning and Design Code to ensure future development activity and construction work nearby doesn't impact the tunnels. The Minister for Planning has also introduced a new Ministerial Building Standard setting out technical matters that builders and engineers need to consider in designing building work near major transport tunnels.

If you plan to renovate or build in the future at a property that is immediately above or adjacent to the alignment of the new tunnels, the Code Amendment means there may be an additional process that will occur as part of the usual approvals required.

Development applications lodged after 31 August 2023 will be subject to the new provisions.

The intent of the changes is not to stop developments, but to ensure they do not impact on the tunnels. In most instances, the Code Amendment is not expected to impact any work a property owner may want to do in the future.

The new requirements are consistent with similar planning measures and standards interstate outlining what builders and engineers will need to consider when designing and building near the tunnels.

The proposed Code Amendment is available on the PlanSA website for you to provide feedback. Consultation on the proposed Code Amendment and Building Standard is open from 31 August to 9 November 2023.

Well Drilling Permit applications

New applications for some drilling activities near the tunnels will now be reviewed by the Department for Infrastructure and Transport to determine any potential tunnel impacts.

Read more information on Well Drilling Permit applications.