The deal is slated for completion in July.
Parties have agreed not to disclose the transaction price, the Finnish company said in a statement.
Pöyry Romania, formerly Consilier Construct, joined Pöyry’s portfolio in 2008. The company has 70 employees and it is part of Pöyry’s Urban business group.
Pöyry is a global company providing consulting and engineering services to businesses in energy, transportation, water, environment and real estate sectors. The company has about 7,000 experts and a local office network in about 50 countries.