There might have been some cheap industrial space left in South Boston back when Adam Romanow started dreaming up his craft brewing business at least four years ago.

But by the time Romanow was ready to sign a lease for his Castle Island Brewing Co., finding an affordable place for a brewery in his rapidly gentrifying neighborhood proved to be impossible. He gave up on Southie last year, and looked to the suburbs instead.

Finally, he realized his thirst could be quenched in Norwood. Last week, Romanow ended his quest, opening a 20,000-square-foot brewery at 31 Astor Ave., in an industrial area near Route 1. Six people are working there now. Castle Island is starting out slowly by selling its beers directly to consumers, using 16-ounce cans: A four-pack of Candlepin ale or a Keeper IPA sells for $10.80, or $12.80 for four cans of the TBD stout.