Repair revenue is the number at the top of the ticket. Profit is what remains after the repair is actually finished, the part is paid for, the technician’s time is recovered, and the callback either hasn’t happened or has been paid for by somebody other than you.
Call the control point completed-repair economics. It follows one fault from diagnosis through authorization, parts, installation, warranty exposure, and supplier recovery.
Price only the first visit and you’ve built a small machine for converting busy technicians into impressive-looking sales reports.
Your labour rate has to recover more than wage. It carries payroll costs, non-billable time, service-adviser work, rent, utilities, tools, software, training, insurance, and capital tied up in bays or instruments.
A wage is only one input to a productive hour.
The Unit
Set your unit before you set the price: one completed repair, not one ticket, labour line, or part sale. It has a beginning and an end.
- Diagnosis produces evidence about the fault and whether repair makes sense.
- Authorization converts that evidence into a bounded commercial promise.
- Completion includes the return path: warranty work, the failed-part return, and any supplier credit.
The diagnostic fee is your first boundary. Diagnosis can take longer than installation. Reproducing an intermittent fault, checking voltage, opening a unit, or isolating a board has economic output even when the customer replaces the item. A separate fee stops that time becoming free whenever the remedy is declined. If you credit it against an accepted repair, that’s an acceptance policy — the recovery has merely moved into the repair margin.
The corpus’s invented refrigerator call shows the logic. The customer pays $109 after a 47-minute diagnostic visit. The fresh-food compartment sits at 11°C with the control set to 3°C, the freezer is at −18°C, the evaporator-fan connector receives 120 V AC, and the motor winding tests open.
The evidence supports a named fault.
It doesn’t yet sell a fan by force of personality.
For the second stage, the estimate lists the $109 diagnosis already incurred, a $129 fan assembly, and $111 for return installation and testing — $349 before tax, leaving $240 to authorize.
That form separates paid discovery from future work. It also says what happens if the evaporator compartment reveals a damaged harness: a new condition needs a new approval, not a creative reading of “customer approved.”
The Quote
A price method allocates your uncertainty. It doesn’t remove it. Use the quote type that matches what you actually know at the decision point.
| Repair quote type | Diagnostic fee | Parts margin | Labour allowance | Warranty boundary | Approval point | Replacement threshold |
|---|---|---|---|---|---|---|
| Diagnostic-only | Separately disclosed and earned for testing and fault finding | No repair part is sold | Covers inspection, testing, and findings | No repair warranty begins without a completed repair | Before diagnostic work where required | Diagnosis can support replacement without making the fee recoverable |
| Fixed repair | Shown separately or explicitly credited | Customer part price must cover supply risk, not only acquisition cost | Defined installation and testing work | Written coverage names the installed part and associated labour | Named fault, named part, scope, and price ceiling | Compare the authorized repair with the cheapest acceptable restoration |
| Time and materials | Discovery can be its own stage | Materials and any handling rule are identified separately | Fixed labour-category rates; estimated hours forecast rather than promise the bill | Separate discovery from ordinary rework in writing | Reporting gate and a not-to-exceed ceiling | Use the estimate and ceiling to let the customer choose before exposure expands |
| Staged estimate | Paid investigation precedes the remedy | Reprice only when the part and supply path are known | Investigation is variable; measurable remedy can become fixed | Each stage states which recurrence or new fault is covered | Fresh approval after the finding | The customer can compare a known repair with replacement after uncertainty falls |
Those rows aren’t interchangeable invoice layouts. A fixed quote makes you carry underestimated work. Time and materials moves much of the quantity risk to the buyer, which is why the cited U.S. federal model uses fixed labour-category rates, material treatment, surveillance, and a ceiling the contractor exceeds at its own risk.
That isn’t a retail repair prescription. It’s a clean warning that an open meter needs a hard boundary.
Staged estimates are usually your honest answer when the failure hasn’t become measurable. Price the diagnostic labour first, then quote the known remedy.
If access, data, teardown, or a site condition remains unknown, use an allowance, an exclusion, or an approval gate. A quote can’t manufacture certainty from a sealed cabinet. The cabinet remains famously indifferent to your sales process.
The Parts Line
Parts margin is often asked to do labour’s job, and then neither line makes sense.
The supplier invoice isn’t the cost of supplying the part. Freight, rush delivery, receiving, storage, financing, obsolescence, damaged packaging, wrong-part returns, consumables, and future warranty sourcing all attach to it.
Keep your markup and margin literal. The IRS example buys an item for $1.20 and sells it for $1.50. That’s a 25% markup on cost but only a 20% gross margin on selling price. A 25% gross margin needs a 33.3% markup and a $1.60 selling price.
If your price file says “50% parts margin” when it means “50% markup,” that isn’t a minor vocabulary crime. It’s a different recovery calculation.
In the invented refrigerator job, the distributor charges $68 for the fan while the customer parts line is $129. That $61 spread has to pay for the work around the part before it can become contribution. The repair record also keeps the distributor invoice separate from the customer invoice. One records your acquisition. The other records the customer’s charge.
Pool them and you get a clean-looking gross margin that vanishes the minute the wrong component returns.
The Return Path
Your most expensive repair often looks fine until it comes back.
A callback isn’t automatically a bad diagnosis. It might be a failed replacement part, an installation error, a continuing original fault, or a new condition. But it’s always a test of whether the original quote priced the obligation it created.
In the worked case, the refrigerator is warm again 12 days later. The written warranty covers the installed part and associated labour for 90 days, so the return starts a linked warranty work order rather than a second paid $109 diagnosis. The technician confirms 120 V at the replacement fan, but the fan doesn’t turn. The customer pays $0. You provide a second truck roll and 71 minutes of field time, and the distributor provides a replacement against the original $68 purchase only after the failed unit is returned.
That’s why completed-repair economics needs three ledgers in the practical sense, even when the accounting system holds them together: the customer invoice, your parts and labour cost, and the supplier or manufacturer recovery.
A supplier credit may restore the part cost. It doesn’t restore the extra truck roll, admin time, unavailable bay, or technician minutes unless the agreement says so.
Manufacturer-paid warranty work gives you the same problem in a more formal shirt. Allowed labour time, specified parts, documentation, retained-parts requirements, claim reductions, and reimbursement delay can make an authorized amount unlike retail economics.
Ford’s year-end 2024 base-warranty and field-service accrual was $14.032 billion, after $5.831 billion of payments during that year. Those aren’t shop benchmarks.
They show that product-sale revenue and repair cash outflow belong to different periods — and that a warranty is an operating obligation, not free demand.
The Decision
Your customer doesn’t compare the repair to a percentage rule. They compare the next spend with the cheapest acceptable way to restore function.
The diagnostic fee is already spent in the repair, replacement, and walk-away branches. It’s sunk cost, not a coupon that makes a weak repair wise.
The refrigerator example makes the comparison visible. A suitable replacement costs $899 delivered and arrives in 3 days. The existing unit has estimated annual operating cost of $104 and the replacement $71, a $33 difference. That difference doesn’t erase the $550 gap between the full $349 repair and replacement during the next year. Cabinet condition, sealed-system status, exact-part availability, food loss, disposal, delivery, and the risk of another failure still decide the ceiling.
There’s no universal “repair below half of replacement” rule in this corpus, because there’s no universal customer alternative.
An industrial asset can justify a costly fix to avoid configuration or qualification work. A household appliance can lose to a delivered replacement sooner. Your estimate’s job is to make the choice honest, not to steer the customer past it.
Read the Closed Jobs
Read the economics of your closed jobs, not just the sales dashboard.
Ticket revenue rises while labour margin falls → diagnostic recovery is broken
Diagnostic work is being given away inside fixed repairs, or billable time excludes waiting, testing, and return verification. Separate the diagnostic charge and compare actual technician time with the labour allowance.
Parts sales rise while gross margin doesn’t → the parts-risk pool is broken
Your file treats the supplier invoice as total part cost, or it pools freight, returns, warranty replacements, and labour recovery into one parts percentage. Separate acquisition, selling price, supply costs, and supplier credit.
Callbacks rise after fixed quotes → scope certainty is broken
The estimate priced uncertain teardown, access, or a continuing fault as predictable installation. Move discovery into a paid stage, write exclusions, and require approval before the next exposure.
Warranty volume fills the schedule while cash contribution shrinks → payer economics is broken
Allowed labour, paperwork, parts returns, rejected claims, and reimbursement delay don’t match retail recovery. Track warranty work orders through final claim and credit, not claim submission.
Customers decline technically sound repairs → the replacement boundary is broken
The completed price exceeds the customer’s actual alternative after delivery, downtime, and remaining-life risk. Preserve the diagnosis as the paid deliverable and correct the estimate or service mix rather than giving discovery away.
The Monday File
Pull 10 of your closed repairs with a callback or warranty claim.
For each, put the original estimate beside the final record: billed diagnostic time, customer labour, actual technician time, supplier part cost, customer parts price, freight or return cost, warranty boundary, second visit, supplier credit, and replacement decision.
The column that stays blank is usually where your price file is lying.
Then change one thing at a time:
- Make diagnostic labour explicit, and state whether it is retained or credited.
- Separate the parts selling price from the margin needed to carry supply and warranty risk.
- Put a written approval boundary between discovery and additional work.
The ticket total is revenue. The completed repair is the cost object. A warranty is not goodwill after the sale. It is labour and risk sold with the sale.
Price the diagnosis. Price the return path. Then decide whether the repair clears the customer’s alternative.