length x width will be a good guess
substract stairways*2
subtract "dead space"
I have heard closets don't count unless they have a light
If you know who built home (which builder), they should be able to tell you floor plan base sq ft. Maybe builder has a web site which shows your model and prevents you from needing to find a person.
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- General questions get general responses. Specific questions get better responses. Want a better answer? Re-read my signature LOL
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