Things to know
Diagnostic time is the line most likely to trigger a "but you didn't even fix anything" complaint if it's not explained. Charging for the inspection that identified the fault, separately from the repair that fixed it, is standard practice. It only reads as fair to the customer when it's labelled clearly, not folded silently into the final labour total.
Vehicle details belong on every invoice, beyond the job sheet. Make, model, registration, and mileage turn a generic invoice into a proper service record. The customer can hand it to a future buyer or use it for a warranty claim, and it protects you if a dispute ever comes down to "which car and which visit was this."
Warranty work still deserves a real price on the invoice, even at zero cost to the customer. List the part and labour at standard rate, then add a "warranty cover" line for the same amount. This shows the customer the actual value of what they received. Free work that looks invisible on the page tends to get undervalued in the customer's memory of your service.
Shop supplies and consumables, like sealant, degreaser, rags, and small fasteners, rarely justify itemising individually, but they add up across a full service. A single "shop supplies" line covering these avoids eating the cost yourself. It also beats listing a dozen 20p items that make the invoice look padded when they're really just the ordinary cost of doing the work properly.
Typical mechanic line items and UK prices
Indicative ranges, excluding VAT. Rates vary by region (London and the South East run higher) and by job size.
| Item | Unit | Typical range |
|---|---|---|
| Labour rate (independent garage) | per hour | £60–£110 |
| Diagnostic (fault code + investigation) | per hour | £50–£100 |
| Interim service (small car) | per service | £120–£200 |
| Full service (small car) | per service | £180–£320 |
| Front brake pads + discs | per axle | £180–£350 |
| Air con regas (R134a) | per regas | £50–£90 |
| Air con regas (R1234yf) | per regas | £100–£200 |
| Cambelt + water pump replacement | per job | £350–£700 |
Common mechanic jobs and how to price them
- Servicing
- Fixed price by service level and engine size, with parts and fluids listed.
- Brakes, suspension and exhausts
- Parts at stated prices plus labour from a time guide, authorised before you start.
- Diagnostics
- Hourly, with a set first-hour fee and authorisation before further investigation.
- MOT repairs
- Separate invoice from the MOT, with each fail item listed.
Regulations and certificates to reference
- Consumer Rights Act 2015 — repairs must be carried out with reasonable care and skill, and parts supplied must be of satisfactory quality. Record what was authorised and what was declined.
- MOT testing (DVSA) — only DVSA-authorised testing stations and testers can carry out MOTs, and the fee is capped by law (currently £54.85 for a car). Repairs found at MOT are invoiced separately.
- Vehicle air conditioning (F-Gas) — regassing or repairing vehicle AC systems requires a refrigerant-handling qualification. Note the refrigerant type (R134a or R1234yf) and quantity.
- Waste oil and hazardous waste — used oil, filters and batteries are hazardous waste and must go to a licensed carrier. Some garages show a small environmental disposal charge.
Payment terms mechanics commonly use
- Payment on collection. A garage’s right to keep the car until paid (a lien) is common, but state it in your terms.
- Fleet and trade accounts: 30 days, with registration and order number on each invoice.
Read more: Invoice payment terms explained · Payment methods to offer clients
VAT and CIS for mechanics
VAT
Labour and parts are standard-rated at 20% once you are VAT-registered. The MOT fee is outside the scope of VAT. Do not add VAT to the MOT line.
Construction Industry Scheme (CIS)
Vehicle repair is not construction, so CIS does not apply.
General guidance, not tax advice — check your position with HMRC or an accountant.
Read more: Do I need to charge VAT on my invoices? · What must an invoice include? (UK legal requirements)
What this template includes
- Parts and labour separated
- Diagnostic / inspection line
- Shop supplies / consumables fee
- Vehicle make / model / VIN in notes
- Card or bank-transfer payment instructions
Full guide
How to Start a Mechanic Business as a Sole Trader
Frequently asked questions
No. The MOT test fee is outside the scope of VAT. Repairs and parts on the same invoice are standard-rated if the garage is VAT-registered.
Yes. Part numbers and brands, whether OE, OE-equivalent or aftermarket, help with warranty claims and show the customer exactly what was fitted.
Record it on the invoice as declined advisories, such as tyres near the limit or a leaking shock. It protects you if a related failure happens later.
Charge a fixed first hour, then get authorisation before more investigation. Many garages credit the diagnostic fee if the customer goes ahead with the repair.
Always list vehicle make, model, registration, and mileage. Separate parts from labour. Show diagnostic time as its own line so customers see it's real work, not a hidden mark-up.
List warranty-covered items with the standard price, then add a "Warranty cover" discount line for the same amount. The customer sees the actual value of the work even though they pay nothing.
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