Every repair bill is built the same way. Once you can see the parts of it, an estimate stops being a mystery.
How a repair bill is built
Parts, plus labor hours multiplied by the shop’s hourly rate, plus shop supplies, plus tax. That is the whole formula. The labor hours usually are not what the job actually took — most shops bill from a standard time guide, so the same job costs the same whether the mechanic was fast or slow that day.
What shops charge per hour
- National average: about $132 an hour, ranging from roughly $85 to $197 depending on the state.
- Illinois average: about $135 an hour.
- Independent shops typically run $80 to $130 an hour.
- Dealerships typically run $130 to $200 an hour.
- A check engine light diagnostic runs about $100 to $200. Always ask whether that fee is credited toward the repair if you have the work done there.
That difference is why the same brake job can be quoted at $250 in one place and $480 a mile away, with neither shop doing anything wrong.
What common repairs cost
National averages for parts and labor together. The DIY parts column is what the parts alone cost if you do the work yourself — the gap between the two columns is the labor you would be paying for. The last column says whether the job is realistic with the $300 tool kit.
| Repair or service | At a shop | DIY parts | Do it yourself? |
|---|---|---|---|
| Oil change — conventional | $25–$55 | $20–$35 | Yes |
| Oil change — full synthetic | $65–$120 | $30–$55 | Yes |
| Check engine light diagnostic | $100–$200 | $0 with your own scanner | Read it yourself |
| Battery replacement | $120–$300 | $100–$220 | Yes |
| Wiper blades | $15–$50 | $15–$40 | Yes |
| Engine air filter | $25–$75 | $10–$30 | Yes |
| Cabin air filter | $40–$100 | $10–$30 | Yes |
| Bulbs — headlight, tail, signal | $25–$120 | $8–$40 | Usually |
| Blown fuse | $50–$120 to look at it | Under $1 | Yes — easiest job there is |
| Tire rotation | $25–$60 | Nothing | Yes |
| Brake pads, per axle | $100–$300 | $35–$150 | Yes — the big one |
| Brake pads and rotors, per axle | $200–$500 | $65–$225 | Yes |
| Spark plugs | $100–$250 | $20–$70 | Depends on the engine |
| Serpentine belt | $90–$250 | $20–$45 | Usually |
| Thermostat | $150–$400 | $15–$50 | Sometimes |
| Brake fluid flush | $80–$200 | $10–$25 | Not for a beginner |
| Coolant flush | $100–$250 | $20–$50 | Not for a beginner |
| Transmission fluid change | $100–$175 | $40–$90 | No |
| Oxygen sensor | $150–$400 | $40–$150 | Sometimes |
| Wheel alignment, four wheel | $100–$160 | Not possible at home | No — needs a machine |
| Starter | $400–$900 | $120–$350 | Advanced |
| Alternator | $400–$1,000 | $150–$400 | Advanced |
| Water pump | $450–$1,100 | $50–$200 | No |
| Timing belt | $400–$1,000 | $50–$200 | No |
| CV axle, per axle | $350–$650 | $80–$200 | No |
| Wheel bearing, per wheel | $300–$800 | $50–$180 | No |
| Struts or shocks, pair | $500–$1,000 | $150–$400 | No |
| Power steering pump | $400–$800 | $80–$250 | No |
| Radiator | $750–$1,850 | $150–$400 | No |
| Air conditioning compressor | $750–$1,500 | $200–$500 | No — sealed system |
| Catalytic converter | $1,300–$3,500 | Varies enormously | No |
| Head gasket | $2,000–$4,000 | — | No |
| Transmission rebuild | $1,500–$3,500 | — | No |
| Transmission replacement, remanufactured | $2,800–$5,000+ | — | No |
National averages, checked 2026. Chicago-area shops generally sit at or above the upper middle of each range. Parts prices vary enormously between vehicles — a Corolla and a 3-series are not in the same universe — so price your own before deciding anything.
How to use this table
- Being at the high end of a range proves nothing. A dealer in a costly area doing a big engine is legitimately at the top. Being at double the top of the range is worth a second quote.
- Compare like with like. “Brakes” can mean pads, or pads and rotors, or pads, rotors and calipers. Those are three different jobs with three different prices. Ask which one you are being quoted.
- A wide gap between the two price columns means a lot of labor. Those are the jobs where learning to do it yourself pays best — and brakes are top of that list.
- Do not shop on price alone. The cheapest quote sometimes means the cheapest parts. Ask what brand is going on and whether the work is warrantied.
Go deeper on a repair
Click a link below for the full breakdown.
- Brake job costs — why “brakes” quotes vary so wildly, and what you are actually being sold
- Battery, alternator and starter costs — the three that get confused with each other
More coming: cooling system, engine sensors and the check engine light, suspension and steering, transmission, exhaust and catalytic converters, air conditioning, and routine maintenance.