Here is the whole pricing model at Earl's Garage. Labor is $85 an hour, and that rate is published on every estimate I write — it's not hidden in a packet. Parts are charged at supplier price plus a flat 15% markup. Industry standard on parts markup is 30% to 45%; the chain shops mark up closer to 100% on most items. I mark up 15% to cover my time picking the parts up at NAPA and to put a few dollars in the till for the rare bad part I have to warranty.
Before any wrench turns on your car, you'll get a written estimate on a carbon-copy pad. You sign one copy, I keep one. If I find something else once the wheel is off, I call you. No surprise charges. No "while we were in there" upsells unless you authorize them.
When the job is done, the old parts come back to you. In a bag, on the seat, in the trunk — your call. Nothing leaves the shop without you seeing why it had to come off. The chain shop will tell you "we put it in the dumpster, hon" — and yes, that's because if you saw it, you might not have signed off on the work.
What the chain shop charges to keep the franchise running — the district manager's salary, the commissioned service writers, the national TV ad budget, the "free brake inspection" loss-leader that funnels you into a $1,800 quote — all of that has to come out of your wallet. I have none of those costs. I have a building I own, a wife who answers the phone, and a part-time helper. That's the whole P&L. That's why my number is lower.