# How to Price Mobile DOT Inspection and Diesel PM Jobs
A mobile diesel and DOT inspection business lives or dies on two numbers: the rate you charge per truck and the drive time you can eliminate by clustering fleet work. Get the rate wrong and you are working nights on a shop's margin; get the routing wrong and half your billable day disappears on the highway. This is how experienced mobile inspectors build prices that survive both a fleet manager's negotiation and an FMCSA audit of your inspection paperwork.
The Two Revenue Streams You Are Pricing
Do not price DOT inspections and preventive maintenance as one thing. They have different time profiles, different liability, and different customers' buying logic.
The FMCSA 396.17 annual inspection is a pass/fail compliance service. The value is the qualified-inspector signature and the record that keeps the truck legal and out of an out-of-service violation at a roadside check. It is fast when the truck is in good shape and slow when it is not.
Diesel preventive maintenance (PM) is scheduled service work: oil and filters, DEF and fluids, brake checks, tire and air-system inspection, tiered by mileage or engine hours (A, B, and C service levels). This is where the recurring labor revenue lives.
Most profitable mobile operators sell them together: the annual inspection is the door-opener, and the PM contract is the standing revenue. Price each so it stands on its own, then discount the bundle deliberately, not by accident.
Pricing the DOT Annual Inspection
A standalone FMCSA 396.17 annual inspection is a competitive, price-shopped service. Truck stops and shops advertise it as a loss leader, so you cannot win on the sticker alone. You win on mobility: you inspect the truck where it parks, so the fleet does not lose a driver's shift shuttling it to a lane.
Realistic 2026 ranges:
- Standalone DOT annual inspection, single truck: $90 to $175
- Trailer inspection: $50 to $110
- Inspection bundled into a PM visit (same truck, same trip): add $60 to $110 on top of PM labor
- Multi-truck on-site rate (5+ units, one visit): $75 to $130 per unit
The standalone single-truck rate rarely covers a dedicated trip. Treat a one-off inspection as a relationship starter, not a profit center, and always quote the multi-unit rate the moment a fleet has more than a handful of trucks in one yard.
What you are really charging for is the paperwork that survives a roadside recon or a compliance review. Your inspection log has to show the checklist items, pass/fail results, the qualified inspector's credentials, and the re-inspection tracking for anything that failed. That record is your product; price it like it matters.
Pricing Diesel Preventive Maintenance
PM is where you set a true labor rate and build margin on parts and fluids. Structure it in tiers so the customer knows exactly what each service level includes.
Set your mobile labor rate. Mobile diesel labor commonly bills at $110 to $175 per hour in 2026, higher than a fixed shop because you bring the shop to the truck and absorb the travel. Your rate has to cover your service truck, tools, insurance, and the reality that you cannot rack up billable hours the way a stationary bay does.
Build tiered PM packages:
- A service (light PM: oil, filters, lube, quick inspection): 1.5 to 2.5 hours of labor plus parts. Common all-in: $250 to $450 per truck.
- B service (A service plus fuel filters, DEF system, more thorough brake and air check): 2.5 to 4 hours. Common all-in: $450 to $750.
- C service (B service plus deeper driveline, cooling, and component checks, often paired with the annual inspection): 4 to 6+ hours. Common all-in: $700 to $1,200+.
Mark up parts and fluids. A 25 to 40 percent markup on oil, filters, DEF, and shop supplies is standard and expected. Add a per-visit shop-supply fee ($15 to $45) to recover rags, cleaner, and disposal. Do not give consumables away inside the labor rate.
Charge travel honestly. A trip charge or per-mile zone rate that recovers drive time. Flat $45 to $95 within a home zone, then per-mile beyond, or a straight $1.50 to $2.25 per loaded mile. The whole economic case for a fleet retainer is that it lets you cluster trucks and spread one trip across many units.
The Fleet Retainer: Where Mobile Beats the Shop
The single most profitable move in this business is converting a fleet from per-visit billing to a per-truck monthly retainer. The fleet gets predictable cost and guaranteed uptime; you get a routed schedule that eliminates dead miles and smooths your cash flow.
Build the retainer from the annual work each truck needs. Take the truck's yearly PM intervals (say, four A services, two B services, one C service with the annual inspection), total the labor and parts, add your travel efficiency for clustered visits, divide by twelve, and add a margin cushion for the unscheduled minor repairs you will catch. Per-truck monthly retainers commonly land in the $150 to $400 range depending on service intensity, mileage, and how many trucks share a yard.
The retainer only works if you know each truck's PM interval and next-due date cold. Missing a scheduled B service on a retainer truck means you either eat the labor or blow the uptime promise. This is exactly the scheduling backbone the Mobile Diesel & DOT Inspection Ops Kit is built around: a per-unit PM interval scheduler by mileage and engine hours, a fleet contract pricing model with a per-truck monthly retainer calculator, and the FMCSA 396.17 inspection log so the compliance side is audit-ready.
Common Pricing Mistakes
- Selling the annual inspection as your headline service. It is price-shopped to the floor. Lead with mobility and the PM relationship; let the inspection be the reason for the first visit.
- Charging one blended hourly rate for everything. Your travel, your diagnostic time, and your wrench time are different. A blended rate quietly subsidizes the far-away, low-parts jobs and overcharges the easy close ones.
- Not tracking inspector credential and brake-certification expiry. If your qualified-inspector status or brake certification lapses, every inspection you signed in that window is exposed. Track expiries as carefully as you track truck due dates.
- Forgetting DEF, oil, and shop-supply markup. Fluids and consumables are real margin. Rolling them into labor at cost is money left on the curb.
- Quoting a fleet retainer without the PM interval data. If you do not know how many A, B, and C services each truck needs per year, your retainer is a guess. Build it from the schedule, not from a gut number.
A Sample Fleet Quote, Built Right
A regional carrier has eight day-cab tractors in one yard. Per truck per year: four A services, two B services, one C service with the annual DOT inspection.
- 4 A services at $325 = $1,300
- 2 B services at $575 = $1,150
- 1 C service + annual inspection at $1,050 = $1,050
- Annual per-truck total: $3,500, minus clustered-visit travel efficiency, plus minor-repair cushion
- Monthly retainer per truck: roughly $300, eight trucks = $2,400/month standing revenue
Because all eight share a yard, one routed visit services multiple units, and your travel cost per truck collapses. That is the mobile advantage priced correctly, instead of a stack of one-off invoices that never build into a book of business.
Next Steps
Start by getting every truck's PM interval and next-due date into one scheduler, and set your inspection paperwork up so it passes an FMCSA review without a scramble. The free starter guide covers building your first zone map and rate tiers, and the Mobile Diesel & DOT Inspection Ops Kit gives you the 396.17 inspection log, the A/B/C PM scheduler, the credential-expiry tracker, and the retainer calculator so both your compliance and your pricing hold up.