The firm, which has been based at its current Miry Lane site in the town for more than 20 years, has taken over 18,000 sq ft of office space at Waterside House, based at Wigan Pier Business Park, on a 10-year lease.
Shearings expects its 200-strong team to be operating from the new site in November following an extensive fit-out over the coming months. The new space will include a travel shop in its reception for customers wanting to drop in and enquire or book face to face.
Group chief executive Richard Calvert said the move was part of a wider, long-term investment programme.
He said: “This is all about investment in the future growth of the business and our commitment to a town which has been a big part of our success for decades.”