I do remodeling by the opening. Don't count on anything going your way. First I figure every thing that has to be removed. Than every thing that has to be reworked. I count openings. Even if it is existing I count it if it is in a remodeled area. All the devices are new and it might have to be reworked. Then I figure home runs, circuits used, service, and other big things. If in doubt add more $. To check myself I might figure a material amount and a guess on how long I'll be there. Do the math and adjust you bottom number.

Tom