Consent is essential for legal and ethical psychological practice. EPs in the UK work with children and young people from ages 0 to 25, meaning that consent gaining practices must take account of the complexities of different professional guidelines, legislation, and case law depending on the age and competence of individual service users. This study used participatory action research to develop consent gaining guidance specific to EPs, considering issues related to children's rights, parental responsibility, Gillick competence, mental capacity, and data protection. Findings from a preliminary study were used by a stakeholder group of EPs to create draft guidance. The project was guided by a working party comprising a trainee educational psychologist, a main grade EP, a professional body representative and a solicitor specialising in education law. Implications for professional practice and future research are discussed.