Win the no-start call, fix it in the parking lot, and keep the car's history in your own system.

Mobile repair work arrives in two shapes. The urgent one is a car that won't start in a driveway, a work lot or an apartment space. The owner can't drive it to a shop and would rather not pay for a tow, so they search, tap the first few numbers on the map and book whoever answers with an arrival time and a straight answer on whether the job can be done where the car sits. The planned one is the owner who wants brakes, an oil change or a serpentine belt done while the car is parked at the office, and the buyer who needs a pre-purchase inspection before a private sale closes on Saturday. Planned customers read reviews and ask what the diagnosis costs before they commit.

A lot of this work comes through other businesses. Tow operators field calls for cars that only need a battery or a starter. Tire shops, detailers, small used-car lots and apartment managers hear about breakdowns first, and a shop that's booked two weeks out can pass along jobs it can't fit. Some repairs have a third party behind them. When the work is part of an insurance claim, put the claim number and the adjuster's contact on the work order and confirm who is paying before you start; Michigan's Department of State, for one, says the customer in an insurance-paid repair is the vehicle's owner or operator, not the insurer, and no work may start on the insurer's word alone without the customer's signed authorization. When the owner has an extended service contract, the FTC tells owners to find out whether the contract company requires pre-approval for repair work, so ask before you turn a wrench.

Lead marketplaces sell mobile repair work one lead at a time. Thumbtack lists mobile mechanics as a service, and its help center says a pro auto-pays for the lead when a matching customer reaches out. The fee lands when the driver makes contact, before anyone knows which mechanic gets the job. A driver with a dead battery needs one mechanic in the lot, so a lead you reach second still costs you. Your own map listing, phone number and list of past customers send no invoice when another mechanic gets to the car first.

Your calendar depends on your climate. In cold states, winter means dead batteries and no-starts, and the federal fuel economy site notes that battery performance decreases in cold weather. It also brings days when lying on frozen pavement or working in sleet isn't safe, so reschedules stack up. In hot states, summer is air conditioning season, and anyone who services a vehicle AC system for pay must be trained and certified under Section 609 of the Clean Air Act through an EPA-approved program. Where winters are mild, rain is the more common reason to move a driveway job. Rules for the business itself vary by state. California's Bureau of Automotive Repair, for example, says a repair dealer registration is required to diagnose, service or repair vehicles for compensation, and it names mobile repair specifically. Check your own state's requirements through our state-by-state guides and your state agency. This overview is general information, and your state agency has the final word.