Auto repair

The repair order is the bottleneck, not the bay

Most shops believe they are short of bays. Measure the day honestly and the constraint is usually approval time.

By the TotalPro360 team · Published 2026-08-07 · Auto repair

Key points

• The car is on the lift and nothing is happening
• Phone approval is the slow path
• Rewriting the estimate as an invoice is pure waste
• Declined work is an asset
• Worked example: where the day actually goes
• Approval is a communication problem with a technical fix
• Measure it before you rent more space

The car is on the lift and nothing is happening

A vehicle comes in, gets diagnosed, and then waits. It waits while the estimate is written up, while the customer is called, while the customer calls back, and while somebody re-enters the approved lines into an invoice. During all of that the car is occupying a bay and generating nothing.

Shops experience this as being short of space. Add up the hours vehicles spend on lifts waiting for a decision and the shortage usually turns out to be somewhere else entirely.

Phone approval is the slow path

Calling a customer to read out a list of parts and prices is slow, error-prone and hard to prove afterwards. It also fails constantly, because the customer is at work and cannot take the call, so the car waits another two hours for a callback.

Sending the estimate as something the customer can look at and approve moves the wait from your bay to their pocket. They approve it on a break, and the shop finds out immediately rather than after the fourth attempt.

Rewriting the estimate as an invoice is pure waste

The approved estimate already contains every line, every price and every part number. Re-typing it into an invoice adds nothing, takes time and introduces the one class of error customers notice immediately: a final bill that does not match what they agreed to.

Converting the approved version directly is not a convenience feature. It is the difference between the number the customer approved and the number they are asked to pay always being the same number.

Declined work is an asset

Every shop recommends work that gets declined. Written on a pad, it is gone. Recorded against the vehicle, it becomes the first conversation at the next visit, with a date attached showing you flagged it six months ago.

That is a genuinely valuable record, and it costs nothing to keep beyond deciding to keep it on the car rather than on paper.

Worked example: where the day actually goes

A three-bay shop believes it needs a fourth bay. Before spending the money, measure the day honestly: for each vehicle, record when it went on the lift, when the estimate was ready, when the customer approved it, and when work resumed.

The pattern most shops find is that diagnosis takes an hour, the estimate is ready by ten, and approval arrives at half past one — because the customer is at work, the shop rang once and left a voicemail, and nobody rang again until after lunch. The car occupied a bay for three and a half hours and was worked on for one.

Three vehicles a day, three hours of waiting each, is nine bay-hours lost daily. Across a three-bay shop open eight hours, that is more than a third of total capacity spent holding cars that nobody is allowed to work on. The fourth bay would have held a fourth waiting car.

Run it for a week on your own board before you price a lift.

Approval is a communication problem with a technical fix

The delay is not the customer being difficult. It is that approving work by phone requires two people to be free at the same moment, and a service advisor and a customer at work almost never are.

Send the estimate as a link instead and the constraint disappears. The customer reads the complaint, the cause and the recommendation in their own words, sees parts and labor as separate lines, and taps approve between meetings. The shop gets a timestamp and a name against the authorisation, which matters in most states because unapproved work is difficult to collect on.

The second-order effect is bigger than the time saved. An estimate someone can actually read, with a declined line still visible on the record, gets approved more often and at a higher value than a number read out over a bad phone line — and when the same customer returns in six months, the work they declined is still there to raise again.

Measure it before you rent more space

For one week, note when each vehicle went on a lift, when the estimate went out, when it was approved and when work started. If the gap between the second and third numbers is the biggest one, more bays will not help.

It is a cheap experiment and it usually changes what a shop spends its next capital on.