The admission nobody wanted to hear
Sean Sweeney ran New Zealand’s largest infrastructure project for years. Now he’s saying the quiet part out loud: the City Rail Link could have been built for roughly half its final price. Asked whether the CRL was over-specified and too expensive, Sweeney told the NZ Herald: “I’m not going to make any friends for saying this, but in a nutshell, yes.”
His prescription is blunt. Projects need to be “more Toyota Corolla, less Rolls-Royce.” He pointed to Copenhagen Metro stations built at a quarter of the CRL’s cost per station, and singled out the decision to lengthen platforms from six to nine cars as one that “probably doubles the cost” when the same capacity problem could be solved by running trains more frequently.
The final bill sits at approximately $5.5 billion. The original commitment in 2017 was $3.4 billion. That is a 62% blowout, and the critical inflection point was not the pandemic.
The 2019 decision that broke the economics
In mid-2019, the project budget was revised to $4.419 billion – a billion-dollar increase driven by scope changes including those nine-car platforms, construction inflation, and increased contingency. Then-Mayor Phil Goff argued $250 million of the increase reflected future-proofing to avoid repeating the Harbour Bridge mistake.
That framing sounded reasonable at the time. But Sweeney’s admission reframes it entirely. The nine-car platform decision was a political and governance choice, not an engineering necessity. It was made before anyone had heard of COVID-19. The pandemic added another $1.074 billion in 2023, attributed to lockdowns and lost productivity. But the structural over-specification was already locked in.
The Auditor-General’s office identified the governance weakness early. In 2022, it noted “confusion about which agency is responsible for planning, managing, and reporting progress” in achieving the project’s benefits. The original 2015 business case estimated a cost-benefit ratio of 1.6. With costs now 60% above the original estimate, that ratio has been badly eroded.
The most expensive country on earth to build rail
In 2023, Sweeney presented data showing New Zealand is the most expensive country in the world to build metro and rapid transit at US$922 million per kilometre. Australia builds at US$321 million. France at US$256 million. South Korea, Spain and Finland at around US$100 million – nine times cheaper.
Sweeney called it “a crisis” and said bipartisan political planning was urgently required. Speaking on Q+A in August 2024, he identified the core structural problem: “Everything is set up as a one-off, and then it’s decommissioned.” The country pays an enormous premium because it never commits to a pipeline of work that would sustain capability.
In September 2024, NBR reported approximately 12,000 construction jobs lost in the previous year, with around 1,200 engineers departing overseas. New Zealand faces an infrastructure deficit estimated at up to $1 trillion over three decades.
The system that produces these outcomes
Infrastructure New Zealand CEO Nick Leggett responded today on Newstalk ZB: “We don’t have the guarantee across political cycles and funding cycles to lock them in and get the efficiency that a small country like New Zealand desperately needs.”
This is the real business story. The CRL is not an isolated failure. It is the product of a system that gold-plates designs to satisfy political ambitions, loads risk onto contractors until they stop tendering, builds nothing at scale, and then blames external shocks when the bill arrives.
Every dollar over the original $3.4 billion estimate is funded by Auckland ratepayers and the Crown. It either raises rates, increases government borrowing, or crowds out other investment. For business owners making long-term capital and location decisions, the demonstrated inability to deliver major projects on budget is not an abstract governance problem. It is a pricing signal about the cost of doing business in a country that cannot build things without burning money.
Sweeney says costs need to be locked down at the start, not managed upward through delivery. He is right. But that requires political discipline that no New Zealand government, of any stripe, has yet demonstrated it possesses.
Sources
- Auckland City Rail Link could have been ‘half the cost’ – ex-CEO Sean Sweeney (2026-05-06)
- City Rail Link blowout – Country’s largest infrastructure project could have been ‘half the price’ (2026-05-06)
- Nick Leggett – Infrastructure New Zealand CEO voices concerns as City Rail Link costs blow out (2026-05-06)
- Political spats driving up NZ infrastructure costs – CRL boss (2024-08-04)
- Sean Sweeney, on not being afraid of ‘big numbers’ – NBR Focus (2024-09-04)
- Auckland’s City Rail Link cost climbs by $1 billion (2023-12-14)
- City Rail Link boss Sean Sweeney slams New Zealand infrastructure costs (2023)
- Part 2: About the City Rail Link project — Office of the Auditor-General (2022)
- Revised cost for City Rail Link – OurAuckland (2019-06-25)