The contractor was confirmed this week as a funding deal for the development was agreed with NatWest for the 50/50 develoment partnership between Welsh Government and Celtic Manor Resort.
A statement from the joint venture said: “A construction contract was also signed with the principal building contractor, John Sisk and Son, who have worked diligently and pro-actively over the past 12 months to ensure construction costs remained within budget.”
The £83.7m scheme will be capable of accommodating up to 5,000 delegates with a total floor space exceeding 26,000 square metres.
It is projected that the new centre will open for business in June 2019.
Stephen Bowcott, Chief Executive of Sisk Group said: “We are absolutely delighted to have been entrusted with one of the most prestigious and important construction projects in Wales and to be using local suppliers and workers.”
Excavation work has already begun on land adjacent to the Resort Hotel and existing Convention Centre at Celtic Manor, clearing the way for the two-year construction project to start in March.