NZ InfraWatch
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2nd Terrace Tunnel
NZ Transport Agency Waka Kotahi · Wellington
A new 0.5km southbound tunnel duplicating the existing Terrace Tunnel. The existing tunnel, opened in 1978, is retrofitted to carry two lanes northbound with fire and life-safety upgrades. Not separately costed: see the Wellington Transport Package entry.
Data current as at 16 Sept 2026, when the pipeline was last checked against its source.
Key facts
- Region
- Wellington
- Part of
- Wellington Transport Package (SH1 Improvements)
- Sector
- Transport
- Status
- Planning
- Estimated value
- Value TBC
- Indicative completion
- TBC
- Funding status
- Part Funded
- Lead organisation
- NZ Transport Agency Waka Kotahi
- Election risk
- Medium
Election risk assessment
One of three components of the $3.8B SH1 Wellington Improvements package (see 'Wellington Transport Package'); Labour and the Greens have said they would reinstate a mass-transit-focused programme instead of the roading-led replacement for LGWM.
Government priority alignment
MEDIUM: Part of the roads-focused replacement for the cancelled, PT-heavy LGWM; aligns with the current transport policy statement, though scope remains contested.
Recent changes
- 2026-W37Major New project added: 2nd Terrace Tunnel (Planning, value TBC).
Chronology
- 2024NZTA Board endorses the preferred option (Oct): a duplicate Terrace Tunnel
- 2025Investment case endorsed (Aug); community engagement on the design runs Nov-Dec
- 2026Early geotechnical and hydrogeological investigations complete; fast-track consent application lodged (Aug 2026)