What are the common general contractor fees in Utah?

[Kristi Harmon]

I'm trying to hire a general contractor for my renovation loan project, which is a small project (installing carpets, appliances, water heater, light fixtures and bath fixtures and few extra small items). One of the contractors added 20% contractor's fee in addition to all the supplies and labor. Is that standard here in Utah right now? Same fees for new construction and small reno projects?  I'm first time hiring a GC and I don't know what I probably should pay for this project and to know if i'm getting overcharged or not.