extension/renovation

Looking for experience of others in house renovation/extension. I intend to do a 2 ?storey extension on floor area of 5mx9m. Downstairs to build a kitchen and family room and upstairs an ensuite br with WIR. This may require an existing room to be changed into bathroom/toilet and walkwaye leading to the new area.
At this stage I am looking at getting the plans prepared. Does anyone know thecharges of a draftsman and how much they would be involved in the project. One draftie has quoted $2200+GST. Is it reasonable?
Anyone with information please.


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