The agency secured the business without a pitch and is working on a campaign to increase awareness of the three different venues for corporate events and social occasions.
The first round of activity will consist of a print and digital campaign to run in the spring and summer.
Maybourne Hotel Group’s advertising was previously handled in-house.
Simon Labbett, the creative director of Hometown, said: "It’s very exciting to be working with three of the world’s most iconic and progressive hotels. Hotels that are incredibly cherished all over the world."
Labbett and David Gamble, the co-founders and creative directors of the Rainey Kelly Campbell Roalfe/Y&R digital shop Saint, launched Hometown in April last year.
The start-up agency has picked up business including a digital brief from ITV and the ad account for the online casino 32Red.