Average invoice value in a garage rests on authorised work

3 days ago
3 min read

Updated: 2 days ago

Introduction

A garage's revenue per job is decided by two things: what the technician finds, and what the customer agrees to. The first is a matter of inspection discipline. The second is almost entirely a communication problem, and it is where most of the money goes missing.

Work identified during a service, written on the sheet, and never authorised is the single largest revenue gap in most independent garages. The customer was not refusing the work — they were refusing an unexplained phone call about an unexpected cost while they were in the middle of something else.

1. Average invoice value in a garage follows the authorisation rate

Finding work is not the constraint; getting it approved is.

Measure identified work against authorised work

Items written on inspection sheets versus items invoiced, over a month, by technician. The proportion is usually well under half and nobody has measured it. The spread between technicians is often as wide as the average is low.

Look at why items get declined

Cost, disbelief, no time without the car, or a call that came at a bad moment. The reasons are few and each has a different remedy. Record a reason code against every declined item for a month.

2. Inspect consistently or the number never moves

An inconsistent inspection produces an inconsistent invoice.

Use the same check on every vehicle

A short standard inspection, done every time, finds the work that a rushed look does not. It also protects you when a customer returns with a fault. A single side of paper is enough.

Record findings with a severity

Urgent, needed soon, monitor. The category is what allows a customer to say yes to some of it rather than all or nothing. Put the severity on the customer copy too.

3. How the call is made decides the answer

This is the highest-leverage skill in the business and it is rarely trained.

Send a photograph or a video

A short clip of the worn component, sent before the call, converts far better than any description. Customers authorise what they can see. Thirty seconds of video is plenty.

Give the consequence and a price together

What happens if it is left, over what timescale, and what it costs. A price with no consequence invites a no.

4. Make partial authorisation easy

An all-or-nothing quote gets refused in full.

Split the quote into urgent and deferrable

Two figures rather than one. Most customers approve the urgent portion immediately when it is separated out.

Book the deferred work before they collect

A date for the rest, agreed at pickup, converts a maybe into a booking. Without it the deferred work is usually lost.

5. Small routine additions add up

Not everything has to be a major repair.

Quote consumables as standard

Wipers, bulbs, filters, screenwash. Cheap, quick, genuinely needed and frequently never mentioned. Add them to the standard inspection list.

Watch labour recovery, not just parts

An invoice heavy in parts and light in labour usually means time is being given away. Compare hours sold against hours worked each week. A recovery rate below three quarters needs investigating.

Conclusion

Measure how much of the work your technicians identify actually gets authorised, by technician, over a month. That single ratio is where the revenue is, and in most garages it sits below half — not because customers are refusing the work, but because of how and when they were asked.

Run the same standard inspection on every vehicle and record each finding with a severity, send a photograph or short video before you telephone, give the consequence and the price together, split every quote into urgent and deferrable so partial approval is easy, book the deferred work before the customer collects, quote the cheap consumables as a matter of routine, and watch labour recovery alongside parts.