该资格反映了高技能的高级美发师的作用，这些美发师发展了复杂的技术技能和知识，是沙龙团队的一部分或与之协调。其中包括在美发产品公司担任技术顾问或独立担任自由发型师的高级美发师。此级别的功能包括自我指导的各种知识和技能的应用以及向同事提供技术领导，培训和支持。此级别的美发师可能会提供专业服务，包括理发，头发设计，染发，复杂的色彩校正，接发，化学重塑，摩擦学和化妆应用。美发四级证书的设计是基于通过美发三级证书或同等学历获得的基础技能。
This qualification reflects the role of skilled senior hairdressers who use a range of highly developed sales, consultation and technical skills and knowledge to provide a broad range of hairdressing services to clients. These senior hairdressers provide specialist services in one or more areas including haircutting, design, colouring and complex colour correction, trichology and chemical reformation. They work independently and many hairdressers at this level provide technical leadership, training and support to team members.<br>This qualification provides a pathway to work as a senior hairdresser in a salon environment, a freelance session stylist or a technical advisor in product companies.