What an Unfilled Technician Role Really Costs You

Most workshop owners treat an empty bay as an inconvenience. It is not. It is a line item, and it is usually the largest single number in the business that nobody has ever written down. Here is how to calculate yours, and what the figure should change about how you recruit.

The empty bay has a number

A technician bay is a production line. When it runs, it converts hours into labour revenue and pulls parts revenue along behind it. When it sits empty, both stop.

Work through it with a simple example. The figures below are a worked illustration, not an industry benchmark, but the structure holds at any charge-out rate or currency.

• One technician, 40 clocked hours a week
• Technician efficiency of 75%, which is the bottom of the healthy band, so 30 billed hours
• Charge-out rate of $180 an hour, giving $5,400 in labour a week
• Labour gross profit at 65%, giving $3,510 gross profit
• Parts at a 0.8 parts-to-labour ratio, so $4,320 in parts revenue, at a 30% margin giving $1,296 gross profit

Now run your own version. Your charge-out rate, your efficiency, your parts ratio. Whatever the answer is, that is what one empty bay costs you every single week, and it does not care why the bay is empty.

How long the bay stays empty is not up to you

The uncomfortable part is that the duration is set by the market, not by how urgently you want the problem solved.

Research by Deloitte Access Economics for the Victorian automotive industry, quoted in the VACC submission to government in March 2025, found automotive vacancies attracted an average of 4.5 applicants against a cross-industry average of 22.6. Of 637 vacancies advertised by the businesses surveyed, only 237 were filled. That is a 37% fill rate.

Read that as a probability. Advertise a technician role and, on those figures, the more likely outcome is that you never fill it at all.

Applied to the worked example above, a vacancy that takes three months to fill costs roughly $62,000 in gross profit. A vacancy that is never filled costs the full $230,000 a year, every year, until something changes.

The shortage behind those numbers is structural and international. The AAAA puts the Australian gap at almost 40,000 technicians, 27,000 qualified and 13,500 apprentices. The IMI reports around 16,000 unfilled roles in the UK, at a vacancy rate of 2.7% against a 2.3% all-sector average. The TechForce Foundation projects nearly one million new-entry transportation technicians needed in the US over five years, with replacement demand outpacing workforce growth by more than four to one. Nobody is waiting this one out.

The costs that never appear on the P&L

The lost gross profit is the visible half. The rest shows up as damage somewhere else in the business.

• Overtime at a premium. The work does not disappear, it gets pushed into penalty hours at a worse margin.
• The owner back on the tools. Every hour you spend covering the gap is an hour not spent quoting, following up, or running the business. That is the most expensive labour in the workshop and it is billed at nothing.
• Comebacks. Rushed work returns. A comeback costs the labour twice and the customer relationship once.
• Longer lead times. When the next available booking is two weeks out, some of those customers do not wait, and some of them do not come back.
• Reviews. Delays and rushed jobs surface publicly. With 97% of consumers reading reviews and 31% now filtering for 4.5 stars and above, a short-staffed quarter can cost you bookings long after the role is filled.
• The second resignation. A short-handed team carries the load until someone else decides they have had enough. This is how one vacancy becomes two.

The cost of filling it with the wrong person

Urgency makes owners hire the first available body. That is a more expensive mistake than the vacancy.

Gallup puts the cost of replacing an employee at one-half to two times their annual salary once recruitment, lost productivity and the learning curve are counted. On a $90,000 package that is $45,000 to $180,000, and a bad hire triggers that cost twice: once when they leave, and once again in the comebacks and team disruption they leave behind.

Before you spend it, check the bay you already have

There is one thing worth doing before you accept the recruitment cost, and it is free.

Technician efficiency is hours billed divided by hours clocked. Healthy is 75% to 84%. Many workshops that feel short-staffed are running in the low 60s, which means the capacity they are trying to hire already exists on site and is not being sold.

One technician at 61% instead of 85% represents about $89,856 a year of clocked but unbilled labour at a $180 rate. A three-technician workshop moving from 65% to 85% recovers roughly $224,640 a year, which is close to the full output of the technician you were about to go looking for, at no additional wage.

What the number should change about your behaviour

Once you know an empty bay costs roughly $4,800 a week, three things stop being optional.

Recruit before you are desperate. A 37% fill rate means the search takes months, so the search has to start before the vacancy exists. Talk to good technicians when you do not have a role open.

Keep a listing live. If posting is free, there is no reason your workshop is not permanently visible to technicians who are quietly looking. The cost of a live listing is nothing. The cost of not being seen the week a good technician decides to move is a week of gross profit at minimum.

Spend on retention first. Every technician you keep is a vacancy you never have to fill at a 37% success rate. Gallup found 52% of people who quit voluntarily said their employer could have done something to stop them. Against a $230,000 a year vacancy, a pay review and a monthly conversation are the cheapest insurance in the business.

Three things you can do this week

1. Calculate your own bay number. Charge-out rate, efficiency, parts ratio, margins. Write the weekly gross profit figure on a whiteboard where you will see it.
2. Check your efficiency before you advertise. Decide whether you are short of people or short of billed hours. The fix is completely different.
3. Put a listing up now, even if you are fully staffed. Being findable costs nothing and the market rewards whoever is visible when a good technician starts looking.

Common questions

How much does an unfilled technician role cost?

Work it out from your own numbers. In a worked example at 40 clocked hours, 75% technician efficiency, a $180 charge-out rate, 65% labour gross profit and parts at a 0.8 ratio on a 30% margin, one bay produces about $4,800 of gross profit a week. Across 48 working weeks that is roughly $230,000 a year from a single technician.

How long does it take to fill a technician vacancy?

Longer than most owners plan for. Victorian survey data from 2025 found that 637 advertised automotive vacancies produced 237 hires, a 37% fill rate. Read as a probability, the more likely outcome is that the role is never filled at all rather than filled slowly.

What are the hidden costs of being short-staffed?

Overtime at penalty rates, the owner back on the tools at no charge-out, comebacks from rushed work, longer lead times that send customers elsewhere, reviews that reflect the delays, and eventually a second resignation from the team carrying the load.

Is it better to leave a bay empty or hire the wrong person?

Neither is good, but a bad hire is worse. The empty bay costs you the gross profit. A bad hire costs you the same gross profit, plus a wage, plus a replacement cost of one-half to two times salary, plus the comebacks and the disruption to everyone else.

Should I advertise even when I am fully staffed?

If posting is free, yes. A 37% fill rate means the search takes months, so being visible at the moment a good technician quietly starts looking is worth more than reacting after someone resigns.