Geoff Seideman has come a long way from brewing craft beers at home.

Tonight he flings open the doors to his latest venture — and Honolulu’s newest brewpub, Honolulu Beerworks, in Kakaako.

This laid-back, warehouse-style pub on Cooke Street will feature 12 beers on tap, all brewed in-house. It sprawls over 3,200 square feet, with an additional 800-square-foot beer garden outside.

Consider this Honolulu’s New Favorite Pau Hana Spot.

With both a culinary and construction background, Seideman spent more than six months gutting and building out the space. “I built out everything except the stuff that can kill you,” he said, laughing.

He enlisted the help from veteran brewmaster Dave Campbell, who has spent nearly three decades in the business, most recently at Aloha Beer, to handle day-to-day brewing.

That’s Seideman on the left and Campbell in the middle.

On Tuesday the media was invited to check out the new pub and sample the craft beers on tap, including the crisp Kakaako Kolsch, the earthy It’s Not Bitter Ale, and the Pia Mahiai Saison made with Big Island citrus, lemongrass and honey.

“The whole neighborhood here is seeking out special, unusual, bolder flavors,” Campbell said. “What we’re doing, it’s a lot more fun than what we might be doing at a chain brewing or family-dining brewpub. We’re able to get a lot more creative here … It’s a little more adventure, a little more passion, a little more soul.”

Here’s the menu, which will change every two weeks or so.

Here’s what the tasting glasses look like. Just $2.

Here’s Lisa Yamada, editorial director of FLUX Hawaii, and Martha Cheng, food editor at HONOLULU Magazine, sampling some of the Honolulu Beerworks’ brews.

A sampling of brews and ingredients.

Seideman shows us the hops he uses.

Though the pub opens today, it will feature a limited, pupu-style menu. The food portion of the business will be rolled out in phases, Seideman said, with compatible fare such as briskets and ribs eventually hitting the menu.

You can sit at the bar with a view of the back room and its fermenters — or you can head outside to one of the picnic tables set up in the beer garden. Or you can pick up a keg — likely in the $75 range — for your own pau hana.

“It’s just the beginning,” Campbell said. “And we look forward to the neighborhood growing up around us.”

Honolulu Beerworks at 328 Cooke St. opens today. Hours are 4 p.m. to 11 p.m. nightly. (It will be closed April 13)