Garage Project have leased a warehouse in Marion St so they can use a wild yeast and expand their offering. Head brewer and co-founder Pete Gillespie pours a beer.

Setting wild yeast free to create crazy new beer flavours will be the focus for Wellington brewery Garage Project, which has expanded into a warehouse in the heart of the city.

The small brewery in the suburb of Te Aro has become well known for its unique, often quirky, take on traditional beer styles, which has won it plenty of awards.

But its new warehouse in nearby Marion St will enable brewers Pete Gillespie and Jos Ruffell to unleash experiments on new flavours using wild yeast.

"These are not yeasts you want to release into your normal brewery," Gillespie said.

"They're like wild animals ... once you let them out you'll never get them back in their cage."

The actual brewing will happen at Garage Project's Aro St premises, before the precious grog is sent down to Marion St for fermenting.

That is when scary part begins, Gillespie said.

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"We experimented with [wild yeast] a bit up in Aro but it's kind of terrifying and you have to spend a lot of time making sure it's not cross-contaminated."

The new fermentation facility - the site of a former printer's - will be manned by some of the Aro St brewery's existing 35 staff.

The yeast is so potent that staff who have been anywhere near the Marion St facility will not be allowed into Aro St, Gillespie said.

Unfortunately for Garage Project fans, the new warehouse will not solve the problem the brewery has keeping up with demand for its beer.

"We've kind of grown as much as we can and we have this ongoing issue of meeting demand, which is lovely. It's a quality problem to have," Gillespie said.

"The sensible thing would have been to get a huge industrial space well away from Wellington, but instead we made the decision to try and keep everything right in the heart of Wellington. I think we always feel happier when we are taking the path less travelled."

The announcement comes days after Upper Hutt brewery Panhead Custom Ales was sold to international brewing giant, Lion Group.

Gillespie said Garage Project had been approached by Lion in the past, but it was not a path they wanted to take.

The first experimental brews from Garage Project's new facility would likely be available in restaurants by the end of the year, he said.