In recognition of their exceptional efforts toward sustainability, Wohlsen Construction Company received Green Plus certification, a national program offered by Institute for Sustainable Development, in partnership with The Lancaster Chamber of Commerce.

The Green Plus certification program is designed to provide small and medium sized employers with affordable educational tools and university assistance to strengthen their triple bottom line - balancing people, planet and performance to reinvest in the community, be a good steward of the environment and impact profitability; access to network with their peer businesses tackling similar issues while sharing best practices; and brand support in the form of certification for those organizations with exceptional sustainability performance.
  
Wohlsen Construction Company was founded in 1890 and is one of the leading merit shop construction firms in the Mid-Atlantic States, serving Pennsylvania, Delaware, Maryland, and New Jersey.

The Institute for Sustainable Development is a public-private partnership between centers at Duke University, University of North Carolina at Chapel Hill, the Chapel-Hill-Carrboro and Greater Durham Chambers of Commerce, the Fenwick Foundation and the Foundation for a Sustainable Community. Major corporate supporters include GlaxoSmithKline and Lenovo.