Depth to leave for plaster on a partition wall extension to a solid wall

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Side view of walls old and new.jpg

Hello I am going to build a plasterboard wall extension (see diagram) to a solid wall and need to know how much depth to leave for a plasterer to do a skim and blend in the plaster to the existing solid wall. Can anyone help please?
 
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2-3mm on top of the 12.5mm plasterboard - just sand/polish until it blends in.

that is assuming the existing is uniform and level.
 

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