The addition of the eight Feathers hotels brings the total number of Hallmark properties nationwide to 28, with 2700 rooms.
The merger sees the group widen its offer in the North West of England with sites in Liverpool, Preston, Chester, Wrexham and Manchester.
Lionel Benjamin, director of hotels at the Topland Group, said: "Topland Group’s investment into the North of England’s hotel industry supports the Northern Powerhouse’s efforts to improve economic growth for the area.”
The former Feathers properties will undergo an interior ‘refresh’ as part of Topland’s ongoing investment in the Hallmark group, including the installation of high speed Wi-Fi and rolling out its new restaurant and breakfast offering.
The company launched the re-branded Hallmarket Hotels as a mid-market chain in September last year.
Topland Group also owns The Royal Crescent in Bath, six Thistle hotels in London and Edinburgh, Hilton Glasgow, Hilton Brighton Metropole, and Ramada London Gateway.