More than 100 different pieces feature in Tono, including mirrors, taps, baths, storage units and furniture.
Details have been kept to a minimum, with taps featuring subtly ridged handles, and sinks tapering outwards like a funnel.
Mirrors are housed in simple illuminated frames, and stone baths feature flecked patterns. Each piece has been designed to mix and match together.
The collection's minimal aesthetic is designed to convey an "honesty of material, simplicity of form and the craft of manufacture," according to the firm.
Video showing Foster + Partners' bathroom range for Porcelanosa
Foster + Partners also produced a set of prefabricated showers, sinks and WCs, which are designed to be easy to install and flexible enough to adapt to different buildings.
The units are similarly pared-back in detail, with flat, circular shower heads and floating shelves.
The collection is designed for both residential and commercial interiors and covers a wide range of materials and colour finishes.
Foster + Partners' Tono range was revealed at the Cersaie International Exhibition of Ceramic Tile and Bathroom Furnishings, which ran from 25 to 29 September 2016 in Bologna.