To replace the traditional plasterboards used in buildings, earthen panels were developed to meet sustainable development challenges. These panels were designed to limit environmental impacts through several approaches targeting the different stages of a building’s life cycle: limiting embodied energy by using local resources, reducing energy consumption during construction by taking advantage of the hygrothermal properties of the earth, promoting the recyclability by avoiding the use of synthetic stabilizers. These panels are designed to be fixed to timber frames or to the inside of load-bearing walls. An initial laboratory study determined the quantities of components and the optimum implementation to meet the expected specifications. A local resource, Manech sheep’s wool as 20 mm fibre length was added at the rate of 1% by volume to limit the cracking of the panels under flexural stress, especially during handling. These fibres reduce panel brittleness, increase ductility. To avoid the use of synthetic binders, the compaction method is chosen. Full-size panels (60 × 60 cm) were produced in a factory and were characterised to validate their flexural strength, shock resistance and abrasion resistance. Flexural strength reached 0.74 MPa, impact depth 1.21 mm and abrasion coefficient 0.47 g/cm2. The feedback of the industrial scale highlights the challenges of large-scale homogenization and the complexity of achieving an aesthetically pleasing surface finish.