u/Lanky_Gold_2545

MEP estimator in the southwest. here with a question.
How do you guys estimate excavation labor? I’ve seen a lot of people calculate the excavation quantity in cubic yards, but I don’t really see anyone assigning labor hours per CY like we do with other trades.
Do you estimate it based on production rates, equipment, crew size, or something else?
I’m trying to build my own labor units for things like trenching, grease traps, underground plumbing/electrical, backfill, and compaction. Is there a book or resource that covers this, or is it mostly based on company history?
Just curious how everyone else approaches it.