the problem with res. bids is that many simply do not know what they want, so $3 sq.ft is the best 'from the hip' to use , especialy for those Sunday evening tire kickers.
i've used this as a general estimate for T&M jobs where the owner/GC either can't or won't make pre-bid decisions.
the 'per opening' method takes more work...
One can always assume from a set of plans the sq footage of rooms and layouts for receptacles, yet lighting will always remain the kicker.
sure, a kit & bath overhead (et all 210.70)can be assumed for code min lighting layout if your thing is bid low and all else extra.
i just find this creates bad relations, and cranky GC's.
the service ?, round fig's~ $20 per ft UG has been competitive here, 1/2 that OH
