Habitat for Humanity Greater San Francisco builds affordable homes in our community. Trained staff and volunteers, aged 16 and older, work together during the week or on a Saturday. In order to be a volunteer, you need not have prior building experience and you donít need to be a star athlete. There are all kinds of jobs to do, some simple, some complex. Habitat personnel will train and supervise volunteers in safety and work projects. The goal is to match a volunteerís ability and interests with the requirements of a particular building task.