The external structure can be finished in many different ways to give many appearances. The simplest is cladding with 150mm Styrafoam, plastic mesh, and an Acrylic plaster which is both breathable and prevents moisture ingress.
Acrylic Plaster is available in many colours and textures and is easy to apply.
Alternatively the building can be clad in fake stone, real stone, bricks or timber to suit the client’s requirements.
Below are some PDF’s showing just some of the designs and how they work.