Opening in a non-bearing brick wall

Opening a non-bearing brick/masonry wall and finishing it in a restaurant kitchen. Both sides of wall are tiled. Wall is approx. 150cm by 250cm. Thickness of wall is approx. 30cm, including tiles. Work needs to be certified. In addition, a linoleum floor needs to be patched and fixed where it meets the wall, and a steel door needs to be replace along with the frame possibly.