We charge an average of 30% as a Wholesale/Retail spread. Smaller items can be more because of the time/labor and materials, but larger jobs like a $50,.000 roof we just completed as just 10%. We also disclose to our owners that we make a profit. The vendor invoice shows the retail price and we pay the vendor the wholesale.
We manage multi-family and single family homes, with a bit of commercial. 30-years in business.