Interior designer designs interior decoration and plans the furnishing of homes, public buildings, ships and other places. He/she studies the general requirements and confers with colleagues and clients to determine the style preferences, space limitations and other similar considerations. He/she also formulates appropriate designs, prepares sketches and models showing wall decorations, colour schemes and choice and arrangement of furnishings, and submits them for approval. He/she estimates quantities and costs of decorating materials and furnishings required, prepares working specifications and supervises decorating work and installation of furnishings.