The Building Regulations set out the legal requirements that must be achieved by new buildings, including dwellings, or by existing buildings which are subject to an extension, a material alteration or a material change of use. The second schedule to the regulations outlines the requirements in 12 parts (classified as Parts A to M) and an accompanying Technical Guidance Document (TGD) is published to demonstrate how compliance with each part can be achieved in practice.
TGD G addresses the requirements in relation to hygiene and at section 2.5 specifically states, in relation to a dwelling, that a room or space containing a water closet should be separated from a place used for the preparation of food by means of a door. The room arrangement described is therefore permissible.
The room in question, however, would need to comply with the basic ventilation provisions addressed in TGD F in relation to sanitary accommodation (not including a bath or shower). In addition, the guidance in relation to access for persons with a disability under TGD M should also be applied.