Yes both are easily built into our yurt, we suggest a wooden deck for easy access, which we can supply with your yurt
Yurts do not need council approval, as many clients build off grid, however, when connecting services please check with your council
When adding a partition wall, it has to be a free standing wall attached to the deck, above is a gorgeous bathroom to show ideas for your yurt
Pictured is a architects drawing used by a client, showing a mezzanine with kitchen and bathroom backs onto the it utilising the plumbing and space, this is from one of my suppliers clients, to put a mezzanine we suggest a 8 metre or bigger as you need this size to attain the wall height and pitch of your roof