The NEES Project had 18 Associate Partners who were mainly private companies that work in the sustainable building sector but also included housing associations and social enterprises. The Associate Partners agreed to contribute their expertise to the NEES Project. Six are based in the Republic of Ireland, two in Northern Ireland, two in Scotland, three in Sweden and three in Greenland. In addition to these, one is a Europe wide network of local authorities and social enterprises.

A number of Associate Contractors were also employed by the NEES project throughout the lifespan of the project to assist with the implementation of the Project Work Plan.