Floor plan - Conversion into a granny flat experiences?

The floor plan was designed as a granny flat and is now intended to become a small practice. For this, 2 rooms (15 sqm + 8 sqm) and a small storage room of about 3-5 sqm are necessary. All interior walls are non-load-bearing, only drywall. It is to become a physiotherapy practice. Does anyone have experience?

It is supposed to become a physiotherapy practice

I don't want to be stupid. But what you want in it, what must be in it, you should write it here. There are people who have never seen a physio from the inside.

Two rooms (15 sqm + 8 sqm) and a small storage room of about 3-5 sqm are necessary

What happens in the rooms? Waiting area?

That means to be used: 1 WC, 1 room 15sqm, 1 room 8sqm, 1 small storage room 3-5 sqm as well as 1 small reception. There will basically almost always only be 1 patient, there can only be short overlaps in which an additional patient is present, so a small entrance area is sufficient. Does anyone have a suggestion? How would you wish it to be?

What is the current construction status?
Did you complete your training as a physiotherapist only after you had planned your house with a normal granny flat?

That means needed are: 1 WC, 1 room 15sqm, 1 room 8sqm, 1 small storage room 3-5 sqm as well as 1 small reception area. There will basically almost always be only 1 patient there, there can only be short overlaps in which an additional patient is present, so a small entrance area is sufficient. Does anyone have a suggestion? How would you wish it to be?

Hm… for example, I can think of an area where clothes can be put down, for example a chair/bench behind a screen. And then a couch/bench you can walk around. But there are also practices where a lot of work is done with wall ladders, bars, mirrors, and other equipment. Possibly a floor mat needs to be placed… You have to say something about that. The rooms are not infinite, but existing. How are the walls designed? Is it drywall? Is the screed already laid?