New Zealand Transport Agency (NZTA) has engaged major construction firms, investors, and financiers to assess delivery and funding options for a proposed second Waitematā Harbour crossing between Auckland’s city centre and the North Shore, with market feedback indicating a preference for a tunnel solution over a privately funded bridge.

An internal report by the NZTA casts doubt on the government's hope of using a public-private partnership (PPP) to finance and deliver a second crossing of Auckland's Waitematā Harbour. The government is currently deciding whether the new crossing should be a bridge or a tunnel, and ministers have expressed interest in private-sector financing arrangements that would spread costs over decades rather than requiring large upfront public spending. A key finding is that the private sector generally prefers a tunnel rather than a second bridge. Although a tunnel is expected to cost more to build, industry participants viewed it as carrying fewer long-term operational and contractual risks. 

The biggest concern relates to the existing Auckland Harbour Bridge, which opened in 1959 and remains a critical transport link. If a new bridge were built alongside it, the two structures would likely need to be managed together to coordinate traffic and maintenance. That would force any private consortium to assume responsibility for the risks associated with the ageing original bridge. According to NZTA, contractors would likely charge a substantial risk premium because it is difficult to accurately estimate and price those risks. 

Another important conclusion is that the government may struggle to secure a fixed-price contract regardless of whether it chooses a bridge or a tunnel. The report suggested that fixed-price offers would likely cover only a portion of the project's expected cost. Instead, many contractors favoured an "Incentivised Target Cost" model, where the government reimburses actual costs while sharing incentives for efficient delivery. The debate is occurring in the context of growing concern about the future of the existing harbour crossing. NZTA has repeatedly stated that the current bridge is ageing and under increasing pressure from traffic, freight, and utility demands, making an additional crossing important for long-term resilience and economic growth. The crossing is considered nationally significant because it supports freight movements, employment access, and essential services linking Auckland's North Shore to the rest of the city. 

Funding remains a major unresolved issue. Separate discussions have included the possibility of tolling both the existing bridge and any new crossing, with some estimates suggesting a toll of up to NZ$9 per trip could generate several billion dollars toward construction costs. However, such proposals have been politically controversial and are far from decided.