Auckland Council has approved a plan to collect $1.1 billion from developers in Drury over the next 30 years.

The money is expected to go towards $2.3 billion of infrastructure costs in the area - expected to see the small semi-rural town grow to a city the size of Napier.

But the threat of legal action still hangs over the council’s proposal, which is now expected to come into effect from June 1.

The Drury-Ōpaheke area is expected to see 22,000 new houses over the next 30 years, which Auckland Council said will require it to invest in everything from new roading and community facilities and parks.

The proposal went out for public consultation in September last year and the council voted to adopt it on Thursday.

Under the new policy in Drury, the average development contribution per home will increase from $22,564 to $74,142.

Kiwi Property development director David Schwartfeger spoke at Thursday’s meeting and said the council’s 30-year work programme would be a disincentive towards development in the area.

He said developers in Drury were already contributing towards roading, stormwater and community infrastructure in the area.

“But we need everyone to work together on this,” Schwartfeger said.

He said some of the council cost estimates for projects had changed since last year’s consultation process, including a cycleway which had increased from $40m to $110m.

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“We think it’s important we get these numbers right before there’s a decision made on them.”

A report to the council in February said developers opposed to the council’s plans in Drury could seek a judicial review.

But councillor Chris Darby said the council had to approve the proposed works programme and its proposed development contributions policy, even if there is a threat of legal action from the developers.

“We’ve got to have the stomach to go through with this,” he said. “Because at the end of the day, it will be the ratepayers that end up paying for it.”

He said the threat of legal action from developers is par for the course.

University of Auckland senior lecturer in architecture and planning Bill McKay said the fact the council is seeking to recover more of the costs from the developers in Drury was inevitable.

He said development like that planned in the area comes at a great cost to councils and ratepayers and only leads to more urban sprawl.

“The model we’ve used in New Zealand for years has been based on developers getting land cheap, often miles away from the city itself, where they build one and two-storey homes.”

McKay said the councils are then expected to pick up the tab for all the associated costs.

“One way to discourage that model is to hit the developers with higher development contributions,” McKay said. “So I’d support the council on this.

“Developers have far too often got a bit of a free ride and the ratepayers and the councils end up paying.”

He said while the $1.1b in contributions expected to be collected from the developers in Drury sounds like a lot, it’s not when you consider the $2.3b bill faced by the Auckland Council.

“And someone has to pay for it.”