Over 25,000 people submit on Christchurch Stadium's future as fears of mounting construction costs rise

The Christchurch Stadium debate is almost over - and it's drawn the largest public engagement since the covered arena was first proposed.

More than 25,000 people have had their say on the project's future, just hours out from submissions closing.

To build or not to build? That's the $150 million question councillors have to answer.

"I think it's a time for us to stop and really think and make sure we have got a stadium that's affordable for the city," mayoral candidate David Meates said.

"It's go, simple as that. I think pause is essentially stop in another guise, it'll take time," Crusaders CEO Colin Mansbridge said.

Last month, the council revealed the cost to build the roofed arena would now be $673 million.

Right now the site is made up of nothing more than shrubs and gravel. To build the council's vision it needs to invest another $150 million. If not, it needs to hit pause and re-evaluate or call full-time altogether on the project.

More than 25,000 people - nearly one for every seat - have made submissions, which close on Tuesday.

"Definitely better areas we could be putting the money towards," one told Newshub.

"[It's] $150 million today. What's $150 million in two years' time? $200 million?" another said.

One of the loudest voices is the Crusaders.

"We all know it's a lot of money. In the context of a 100-year asset, that sort of money we'll look back on it in 20 or 30 years' time and wonder what all the angst was about," Mansbridge said.

The man vying to be the city's next mayor worries the price could blow out even more.

"Well at the moment we've got an estimate of $680 million for a stadium and there is no guarantee that's not going to increase dramatically," Meates warned.

The future of the arena that's been talked about for a decade could finally be decided next week.