The business, which has created jobs after winning a £120m contract with the Ministry of Justice, has bought the Orion building close to its Link Up House headquarters to create more than 100 new car parking spaces for staff.
Under the major new deal with the Ministry of Justice, thebigword has also recruited more than 3000 linguists to provide interpreters and translators to courts, tribunals, prisons, the probation service and other organisations in the justice sector, such as CPS and Police forces.
Chief executive of thebigword, Larry Gould, says: "We are an international company and have offices around the world. However, we are proud to be headquartered in Leeds. Leeds has been a fantastic source of talent for us over the years and it’s fantastic to be able to invest more in the city.
"The knowledge, enthusiasm and passion of our people in Leeds has been instrumental in the continued growth of thebigword and this investment is a further demonstration of our commitment to the city.
"The recent wins have been fantastic for the business, but we still have big ambitions. We’ve been in Leeds for more than 30 years and know we can rely on this city and region to deliver the people and skills we need to realise those ambitions.
"I’m hugely proud of our people and this city and we remain committed to investing further in them both in the months and years to come."