Excerpt from an article on AAA's website:
"The cost to fix your car has a major ZIP code factor. The average mechanic labor rate is variable across the country, from less than $100 to over $200 per hour. However, a new analysis from the 2025 PartsTech Report: State of General Auto Repair Shops in the U.S. pins the sweet spot: Almost half of all auto repair shops price their labor between $120 and $159 per hour."

If you are doing basic upholstery work on a common car, you shouldn't charge any less than a mechanic would at a repair shop. Of course if you are doing custom work or working on a classic car the rate should be much higher.