Labor overlap: what to bill when two jobs share a teardown

Book time is written one operation at a time. Each published time assumes the vehicle rolled in assembled and this is the only job being done, so every operation carries its own access: pulling the cover, draining the coolant, moving the accessory drive out of the way. Sell two operations that need the same access and the ticket bills that access twice.

Key takeaways

• Published times each carry their own teardown, and stacking two of them charges it twice.
• Mitchell 1 publishes combination times for jobs commonly done together.
• The guide excludes rust, broken bolts, hazmat disposal and machine work, which is money shops forget to add back.
• Two repairs in different places on the vehicle share nothing and both bill in full.

Where does the overlap come from?

A labor guide publishes a time per operation. The methodology is the vendor's own, and the number covers the work that operation requires on its own. Mitchell 1 has been publishing these estimates since 1946 and says plainly that they remain estimates which may contain individual errors.

The trouble starts at the second line. A timing belt operation already includes getting the front of the engine open. The water pump sits behind that cover. Price both at standalone book time and the customer pays twice for the same hour of cover removal, with the shop looking expensive for work nobody did twice.

The teardown is what they have in common. Once the front cover is off, the pump is sitting there. Once the caliper and carrier are off the knuckle, the rotor comes off with two fingers and a hammer tap. The second repair on each of those rows costs a fraction of its standalone time because somebody already did the hard part on the first line.

Does book time include removing what is in the way?

For that one operation, yes. The access is already inside the published number, which is why a single job prices correctly straight out of the guide. Removing the cover is part of replacing the thing behind the cover.

The problem appears at the second line, where that same removal shows up again inside a second published time. Shops search for this as labor overlap. The guides describe it from the other direction, as the time the second job adds once somebody is already in there.

What does the guide say to do about it?

Use the combination time. Mitchell 1 defines it as "additional labor times to be used when performing tasks which are directly related to the original operation and are conveniently done along with it."

That is a published number, sitting next to the operation you already picked. The primary job carries its full time. The second job carries what it adds once the vehicle is open, which is usually the part swap and very little else.

Where the guide publishes no combination time for a pair, somebody has to decide. The question to answer is narrow: does the second operation repeat work the first one already paid for? Two components in different physical locations share nothing, and both lines bill in full.

Guides disagree about this, which is its own headache. A shop running two subscriptions will find one publishing a companion time for a pair while the other lists only standalone operations. Pick which labor guide wins for your shop and write that down. The decision costs nothing and it stops the same argument recurring every time a second advisor prices the same pair.

The overlap that runs the other way

The expensive version of this mistake has nothing to do with double billing. An advisor who knows two jobs share a teardown often responds by leaving the second job off the estimate, which hands the customer a reason to come back in four months for a repair that could have been done today for the price of a part and twenty minutes.

A water pump behind a timing belt is the standing example. The pump is a wear item sitting behind six hours of access, so selling it while the vehicle is open is cheaper for the customer than a second visit and worth more to the shop than an empty bay. Leaving it off is not conservative. It is declined work that nobody even offered.

The same logic covers the thermostat with the water pump, the tensioner and idlers with the belt, and the caliper hardware with the pads. Guides publish companion times for most of these because the industry expects them to be sold together.

Does flat rate change the answer?

The overlap sits in the published time, so it applies whether the technician is paid flat rate or by the clock. What changes is who feels it.

On flat rate, a technician paid two full book times for one teardown gets rewarded for the shop's pricing error, and the same technician eats the loss on the rust the guide never covered. That asymmetry is why shops end up with senior technicians quietly avoiding salt-belt exhaust work. Our comparison of book time against actual time covers where each one breaks down.

Watch your effective labor rate after you clean this up. Tickets get slightly smaller and close at a higher rate, and the hours you bill for rust and broken fasteners land back on the invoice where they belong.

Canned jobs bake the decision in

Most shops meet this problem through a canned job rather than one line at a time. A canned job for a timing belt that already contains the pump, the tensioner and the correct combination time prices itself correctly forever. One built by stacking two standalone operations prices itself wrong forever, on every ticket, without anybody noticing.

That makes canned jobs worth auditing on a schedule. Our guide to auditing your canned jobs walks the process, and the comparison of a canned job against raw labor guide time covers when each one is the right tool.

What the guide leaves out, which is where shops lose money

The exclusions matter more than the overlap on most tickets, because they run the other direction. Here is what the published Mitchell 1 times do not factor in:

• Disposal of hazardous materials, unless indicated
• Diagnosis, unless indicated
• Machine operations
• Removal of locking lug nuts or wheel covers
• Time necessary to free up parts frozen by rust or corrosion
• Broken bolts, studs and similar
• Removal of excessive grease, tar or undercoating
• Any other material that interferes with the operation
• Cleaning areas of the vehicle contaminated by failure of the component being worked on

A shop in the salt belt runs into four of those on a routine exhaust job. Book time never contained that work, so adding it is billing what the guide always expected you to bill. Advisors who have been told their whole career to stick to book time are often surprised by this one.

How the two lines should read on the ticket

Itemize both repairs. The customer approved two jobs and the invoice should show two jobs, because a single collapsed line reads like a guess and invites the phone call you do not want.

Write the reasoning on the RO while the vehicle is open. Six weeks later, when the same pair comes up on another car, the next person pricing it starts from what you decided instead of guessing again.

What to check on your own tickets this week

Pull the last twenty tickets that carried two or more labor lines on the same subassembly. Two questions:

1. Did any of them bill two full book times for operations sharing one teardown? Those tickets were quoted high, and the ones that closed left a customer feeling it.
2. Did any of them bill straight book time on a job that needed a torch? Those were quoted low, and the technician ate the difference.

Both errors come from the same habit of reading one number out of the guide and typing it. The first costs you sales. The second costs you hours.

Fixing it is a twenty-minute job on your canned jobs and a conversation with whoever writes the tickets. More on how a priced estimate comes together is on the blog, and the mechanics of the pricing itself are in how an estimate gets priced.