Evans is relinquishing her role following eight years at the NFB.
She will remain at the federation until April 2014 when she will become chief executive of The Building Services Research and Information Association.
Paul Senior, Chairman of the NFB said: “Julia has taken the Federation into ever more ambitious territory in her years at the helm.
“In a difficult economic climate, she led and inspired her team to keep up the successes of the NFB, and to provide sterling support, advice and services to members.
“Julia has led from the front, and we are very sad to see her go but congratulate her on her new opportunity. We wish her every success and are pleased that she remains in the industry and will continue to contribute to its recovery and success.”
Evans said: ”It is a real wrench to move on but I believe it is time for a new challenge.
“I could not have achieved anything without the dedication and commitment of the NFB staff and the great teamwork that lies behind all our activities. I want to thank the staff, members, associates and partners for their support, advice and insights.
“This industry is a fascinating one, with many levels and skills and operators. I have been proud to have spent several years representing the contractors and builders involved in the built environment.
“In my new role I will represent another crucial side of the sector, that of the environmental, technical and sustainable agenda. I am looking forward to joining BSRIA and taking this important work forward.”