Doorway between open plan kitchen living area and toilet

I asked that question in December 2016 of a building control officer on a project which has just been completed and where an internal (dark ie no window) toilet was proposed off a kitchen. While I would recommend highly having a double door to create a lobby between the kitchen and toilet to prevent odours travelling into the living/kitchen area; even with a fan in the toilet, in this instance it was permitted without a lobby ; ie accessed directly off the kitchen provided there was a fan in the toilet. Building Control officers` recommendations are usually beneficial and complying with the building regulations which are created with good reason, is a good idea. I did emphasise to the client that while this may be allowable it is not entirely desirable in my view.

That sounds Correct. If you have one door only leading into two spaces, then have a separate door into the WC from the utility area. This will allow privacy within the WC.