This article shows how the concept of a recruitment niche can be valuable in understanding the difficulties the Guide Association in the United Kingdom has in recruiting new volunteers. Understanding Guiding as career volunteering, within serious leisure, shows how the distinctive ethos of the existing volunteers contributes to the social construction of the recruitment niche. The defining boundaries of the niche restrict the ability to recruit new volunteers. Thus the article gives an example of how a recruitment niche for a voluntary organization can be defined using the socially constructed ethos of volunteers involved in career volunteering rather than by characteristics such as level of educational attainment. It also demonstrates the implications of this for voluntary organizations wishing to increase recruitment.