Fibre-reinforced polymers (FRPs) are increasingly used for mobility applications due to their excellent properties in lightweight design. In addition to adequate mechanical properties, flame retardancy is a critical requirement for most of these applications. Because FRPs are usually combustible, flame retardants are required. However, they can impair the properties of composites and should therefore be used as little as possible. Typically, the surfaces of structural components are exposed to flames, therefore this work focuses on the protection of the outer layers. In this study, GFRPs are locally modified with red phosphorus (RP) to achieve flame-protective behaviour at low RP content.