It coincides with the company's notable expansion, as seen by its over €40 million in revenue last year.
The 400 employees that now work for the firm at its offices in Belfast, Cork, and Dublin will be supplemented by the new hires.
A large number of the new positions will be in project management and quantity surveying, inside the company's real estate and infrastructure divisions.
According to Philip Matthews, Managing Director of Turner & Townsend Ireland, "we have experienced substantial growth in Ireland over the past three years, more than doubling our workforce to nearly 400 nationwide."
"This expansion stems from both deepening relationships with existing clients and diversifying our expertise to attract new business."
Townsend & Turner Ireland is expected to increase by 20% this year, and according to Mr. Matthews, the firm intends to hire 600 Irish people by the following year.
The news was released concurrently with the formal opening of the business's new Dublin office, 1GQ, which has a view of the Liffey.
"Our new Dublin office at 1GQ reflects this growth while also creating an environment that encourages innovation and collaboration with clients and colleagues alike," stated Matthews.
Jack Chambers, the minister of finance, launched the new office.
"It is really important we align infrastructure delivery with the pace of economic and population growth," he stated.
He went on to say that the government is dedicated to bringing the nation up to speed in a number of crucial infrastructure areas, "in a responsible and coherent way, focussing on value for money, cost effectiveness, but also competitiveness."
In a number of industries, Turner & Townsend provides project management, cost management, project controls, digital, and consultancy services.
It is engaged in working on some of the biggest infrastructure projects in the nation, such as Uisce Éireann, Eirgrid's Celtic Interconnector, Metrolink, and daa's capital investment program.
In the residential sector, it is collaborating on the St. James's Gate plan with developer Ballymore and on Lime Street with Marlet Property Group.