B
bugs183
You could get a cabinet maker to make a hardwood threshold strip to cover the cuts, if you cant hide it make a feature of it.
Are you sure he's a tiler?
It's the first thing we learn - to set out so you end up with NO tiles/cuts going from 5mm to 30mm. Especially around a feature wall such as one with patio doors.
That aside - as above, you perhaps need to use a uPVC strip there. 30mm isn't a big strip when it comes to uPVC and if they're good with a Silicon gun they can make it look quite smart and part of the door frame etc so it wouldn't be noticeable at all.