Porterhouse Brewery

While there were over two hundred breweries in Ireland during the 19th century, by the twentieth century the market was largely served by a few large breweries. It was in this environment that, in 1989, Liam Lahart and Oliver Hughes bought a run-down building in Bray, County Wicklow, which became the company's first pub. In 1996, the Porterhouse brewpub was opened in Dublin's Temple Bar area. They opened their next bar in Covent Garden London in 2000. They opened Porterhouse North in Glasnevin, Dublin in 2004, and the group purchased another property in Dublin city centre in 2004. In January 2011, they opened a premises on Pearl Street in Manhattan, New York, trading at Fraunces Tavern. The original bar in Bray, was sold in February 2019.

As of 2021, the company reportedly had between 280 and 300 employees, declining to 180 by early 2022. As of late 2022, the company's website listed four bars: two in Dublin (in Temple Bar and Nassau Street), one in London and one in New York.

In April 2023, a report in the Irish Independent indicated that Irish MMA star Conor McGregor had "agreed to buy the Porterhouse Brewery in Dublin".

Other businesses, operated by the Porterhouse Group, include a chain of tapas bars which, as of 2021, had four locations in the Dublin area (South William Street, Temple Bar, Camden Street and Dundrum) and one in London. It also owned the Lillie's Bordello nightclub.

In 2011, Porterhouse announced a desire to build a distillery in Dingle, County Kerry. The distillery opened in 2012 trading as Dingle Distillery, part of the Porterhouse Group.