The 63-outlet listed, which operates the Revolution Bars and Revolución de Cuba brands and is listed on the London Stock Exchange, has taken on Roche following a competitive pitch.
The company has previously used agencies for trade PR but the new, 12-month brief also incorporates consumer PR and marketing.
In a statement, Roche said: "The 12-month campaign will see Roche Communications drive continued awareness of the distinct brands across food, drink and lifestyle media as well as oversee future openings."
Roche’s appointment comes as Revolution Bars Group targets further growth. It has opened five sites this year and plans to open the same number in 2017. The company floated on the London Stock Exchange last year, bringing in corporate and financial PR support from Instinctif, saying that it planned to grow to 140 bars across the UK and Ireland.
Revolution Bars trading director Myles Doran said: "We are looking to amplify our success stories and maximise our premium customer proposition. We are committed to future growth and are looking forward to communicating our plans, through executing consumer facing campaigns, as we take the business to the next level."
Roche MD Rochelle Cohen said: "The team and I are looking forward to raising the consumer profile of the estate and building on the success of these two brands."