Auto Repair Guide

Published: 2026-10-30 · Reviewed: 2026-11-04

Job Cards: Running an Auto Repair Workflow

Why this matters

A car comes in with a noise. The service advisor writes “check noise” on a scrap of paper. The technician finds a worn bearing, orders the part, fits it, and the customer refuses to pay because nobody told them it would cost that much. Every step of that story is a missing piece of paperwork. A job card is the single document that follows a vehicle from intake to handover, and a shop that runs on job cards doesn’t have these fights. The workflow is six stages, intake, diagnosis, authorization, work, quality control, handover, and the job card carries the car through all of them.

The six stages, on one card

1. Intake. Vehicle details (registration, make, model, mileage, fuel level), customer contact, and the reported problem, in the customer’s words, written down while they’re standing there. Walk around the car and note existing damage: scratches, dents, cracked glass. Photograph it. The intake note is what stops the “that scratch wasn’t there” conversation at handover. Record the promised completion time, and make it one you can keep.

2. Diagnosis. The technician’s findings, written on the card: what was inspected, what was found, what’s recommended. Distinguish clearly between what the car needs now (safety-critical) and what can wait (advisory). Customers decide better, and trust you more, when they can see the difference.

3. Authorization. The customer approves the work in writing before a spanner is lifted. This is the stage that saves you money. A signed authorization with the agreed price (or the agreed estimate range) is the difference between “go ahead” and “I never agreed to that.” Verbal approvals are where profit goes to die: the customer remembers a lower number, you remember a higher one, and the job card has no opinion because nobody wrote it down.

4. Work. The technician records what was actually done: parts fitted (with part numbers), labour hours, fluids used, torque settings or measurements where they matter. This isn’t bureaucracy, it’s the record that answers the warranty question six months later (“did we fit that alternator, or did they?”) and the record that lets the next technician pick up where this one left off.

5. Quality control. Someone other than the technician who did the work checks it: road test where appropriate, re-check of the original complaint, visual check of the work area. QC gets a signature and a date on the card. A shop with a QC step catches the loose wheel nut before the customer does. A shop without one finds out on the phone.

6. Handover. The customer is walked through the work: what was done, what was found that needs future attention, old parts offered back (more on that in the quoting guide). The invoice references the job card number. The customer signs receipt of the vehicle. The card is filed, by date and by registration, because the next visit starts with the last card.

Practical steps

  • One card per visit, opened at intake. No card, no work. Make this the rule with no exceptions, the “quick favour” that skips the card is the one that causes the fight.
  • Number every card sequentially. The number ties the card to the quote, the parts order, the invoice, and the warranty record. Gaps in numbering get investigated.
  • Authorization signatures before work, always. Even for regulars. Especially for regulars, familiarity is where the expensive assumptions live.
  • Advisories go on the card and on the invoice. “Front tyres at 3mm, recommend replacement within 3 months.” Written advisories do two things: they protect you if the tyre fails, and they book the next visit.
  • File cards so you can find them. By registration number is best for a repair shop, the customer calls, you pull every card for that car, and you know its whole history in thirty seconds.

Common mistakes

  • Verbal authorizations. “He said to go ahead” is worth nothing when the bill is disputed. The customer signs, or the work waits.
  • Intake notes that say “check noise.” Vague intake produces vague diagnosis produces disputed bills. Write the customer’s actual words and the conditions: “rattling from front left over bumps, started two weeks ago.”
  • Skipping the damage walk-around. Five minutes with a torch and a camera at intake saves the argument at handover. Every time.
  • No QC signature. When the technician checks their own work, the QC step is theatre. A second pair of eyes, a signature, a date, or it didn’t happen.

Templates that help

Bottom line

Six stages, one card, no exceptions: intake with a damage check, written diagnosis, signed authorization before work, a real work record, independent QC, and a proper handover. Verbal approvals and scraps of paper are the most expensive habits in the trade. The job card is cheaper.