Step 1: Design
Step 2: Materials Cost
Step 3: Labor Cost
Assuming you are serious- you need to follow the actual flow path of construction. Have you drawn it yet? I mean at minimum, drawing it on a simple drag and drop architectural type of program, or at least on a sheet of paper? Do you have to sweat building permits? Zoning? Then decide on structure and calculate the materials cost. (who is paying for materials?) After the first two steps, then you estimate Labor.
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