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Side extension - Staircase drawings

Hi, I’m needing a draftsman to help with this project of mine. I am wanting to create a side extension with an internal staircase, to the exterior of the existing structure. Connecting the 2 levels of the house as there are 2 rooms upstairs and a rumpus downstairs. The existing floorspace is too limited to add the stairs internally hence the extension. Could a draftsman do the drawings and let me know an estimate on how much it would be to get the drawings etc so I can plan budget. Thanks heaps!