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After doing several different models with stable material and labor prices then you can do a square foot pricing. I only do by the hole.
I know what it takes. I get a prim a dona that wants switches on every wall for every receptacle square foot pricing wont work.
Do it the hard way then do the square foot pricing for a double check. After a couple of models then do the square foot rate.
As for change orders. Im inclined to do it the hard way .. box receptacle wire breaker labor... before I snap off an estimate.
No credit for already ordered work.