Police are concerned about the amount of drunken violence happening after hours in the Chaffer's New World carpark in central Wellington.

A central Wellington supermarket has been accused of being "willfully blind" to years of drunken violence in its car park after hours, including a 30-man brawl just weeks ago.

The car park at New World Wellington City, generally known as Chaffers New World, on Wakefield St has become such a hub for alcohol abuse, fights, theft and disorderly conduct after dark on weekends that police have dubbed it and Blair St "Wellington's crime corridor".

New World's liquor licence is now under threat as a result. It sought a renewal from the Wellington District Licensing Committee on Friday but police raised serious questions about whether it should be granted.

But while the store's managers do not dispute the crime is taking place after its shuts at 11pm, they believe they are doing everything possible to stamp it out.

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Police told the licensing committee that the majority of those at fault were "young" people either pre-loading before heading to bars in Wellington's CBD, or side-loading between visits to pubs on Friday and Saturday nights.

In the 12 months since June 2014, the car park was the scene of 30 violence and disorder callouts, 18 alcohol-related harm callouts and 12 theft callouts, excluding shoplifting)

In the early hours of October 11, Police were called to quell a large fight involving up to 30 people.

Two Wellington police officers said they had been raising concerns about the car park since 2013 but their impression was that the store did not care what happened after closing, and was only prepared to do "the minimum" to address it.

Wellington City New World director Gary Baker said he was only made aware of the car park issues in December 2014, and had been working with police to solve the problem since then.

Two extra security cameras had been installed in the car park, the lights were now left on overnight and security guards had been employed after hours.

The supermarket also began a one-month trial over Labour Weekend of chaining up the car park on Friday and Saturday nights.

"We have never condoned this behaviour," Baker said. "We have an ongoing commitment to addressing the problem."

But Sergeant Damian Rapira-Davies suggested Baker only started chaining up the car park recently because he was worried about not getting his liquor licence renewed.

"Are we guilty of dragging our heels a little bit on closing that car park?"

Store manager Paul Baker said he had been discussing the car park problem with police since 2013 but was only made aware of the severity of what was going on in the past few weeks.

He denied the store's inability to get on top of the problem before now was because it considered the crime a low priority, pointing out that police concerns were always met with actions, such as installing security cameras.

Chaining up the car park was problematic because some staff, like shelf-fillers and bakers, worked outside of trading hours and it could be dangerous if they had to park further away, Baker said.

The majority of alcohol being consumed in New World's car park after hours was not purchased at the supermarket, although some of it was, police said.

Chaffers New World also lost its liquor licence for five days in August after it was caught selling alcohol to two 16-year-old boys who produced genuine passports when asked for proof of age.

Human error turned out to be the cause after a checkout operator entered the wrong birthdate into the checkout machine.

The hearing continues in November.