Ask a garage how the week went and the answer is usually about how busy it was. Busy is not a measure. Two workshops with the same four ramps, the same four technicians and an equally full diary can be several thousand pounds a month apart, and the gap is almost never visible from the diary.
Start with the hours you are paying for
The denominator is available hours: the technician hours you are committed to paying for this week, less holiday, training and anything else you know is gone. Four technicians on a standard week is a fixed cost that arrives whether the ramps are full or empty.
Everything else is measured against that number. A garage that thinks in jobs per day cannot see the difference between a day of four long jobs and a day of eleven short ones, and the second day usually has a great deal more unpaid time hidden in it.
Do it per bay as well as per technician where the bays are not interchangeable. An MOT bay, an alignment bay and a general ramp have different capacities and different constraints, and averaging them produces a number that describes nothing you can act on.
The five numbers, and where each one comes from
| Measure | What it counts | Where the number comes from |
|---|---|---|
| Available hours | Technician hours you are paying for this week | Contracted hours, less holiday and training |
| Attended hours | Hours the technician was actually on site | Clock in and clock out |
| Clocked hours | Hours booked to a job card | Technicians clocking on and off jobs |
| Sold hours | Hours you invoiced the customer for | Labour lines on the invoice |
| Booked hours | Hours the diary has already promised | The diary, looking a week ahead |
Attended hours that never reach a job card are the first place to look. They are usually real work, just work nobody is charging for.
Sold hours and clocked hours are different questions
Clocked against attended tells you how much of the day reached a job at all. The hours that go missing here are collections, road tests, parts runs, customers at the counter, warranty rework and the twenty minutes spent looking for a locking wheel nut key. None of that is idleness and most of it is not chargeable either.
Sold against clocked tells you whether the price is right. If a job consistently takes three hours and sells for two, either your book time is wrong for the vehicles you see or the job is being quoted by somebody who has not done one recently.
The two problems have opposite fixes, which is why they need separating. Missing clocked hours is an operational problem about how the day is structured. Sold hours below clocked hours is a pricing problem, and no amount of working faster will solve it.
Watch rework specifically. A comeback is clocked hours with no sold hours behind them, and a garage that carries a steady few per cent of rework is paying for the same job twice while believing it is busy.
A full diary is not a profitable one
A diary filled with cheap short jobs is full and unprofitable. Four MOTs and six oil services can occupy a whole day, keep everybody moving and generate less margin than a single clutch, and the day will feel like a success to everyone who worked it.
The MOT is worth having for what it finds rather than for what it is. Priced near the statutory maximum and taking most of an hour of a tester time, the test itself carries very little. The value is the failure, the advisory and the fact that the car and its owner are both on your premises.
That is an argument for filling MOT slots, not against them. It is an argument against judging a week by how full the diary looked, and for looking at what a day of the work you took actually left behind.
Look at the mix over a month rather than a day. If the proportion of the week going to short low margin work is rising, the diary is filling itself with whatever is easiest to book and the larger jobs are being squeezed out by the way the slots are laid out.
Where the gaps actually come from
Very few gaps are empty slots that were never sold. Most are jobs that were booked and then stopped, and they cluster into four causes: the customer who did not turn up, the part that did not arrive, the authority that never came back and the job that was underestimated and overran into the next one.
No shows are the easiest to attack and the one garages tolerate longest. A booking that costs the customer nothing is a booking with nothing holding it in place, and a deposit on a longer job changes that overnight without changing anything else.
Waiting for authority is the most expensive because it happens mid morning with the car already on the ramp. A quote the customer can open and approve on their phone, with a photograph attached, turns a two hour wait into a twenty minute one on most jobs.
Parts delays deserve honesty about which they are. A part ordered late in the day is a process problem you can fix. A part nobody stocks within fifty miles is a planning problem, and it argues for asking on booking rather than on the ramp.
Filling a gap the same morning
A gap that appears at nine has to be filled before about half ten or it is gone, and the only work that moves that fast is work from customers you already have.
The best source is the list of declined advisories on vehicles you have seen recently. Somebody told six weeks ago that their rear pads had a couple of months left is the easiest call you will make, because the conversation is already half had and the price is already known.
The second source is the MOT and service reminders due in the next fortnight. Bringing one forward costs you nothing, since the work was coming anyway, and it fills today rather than a day that is already full.
The third is an online booking page that is open when you are not. A meaningful share of garage bookings are made outside working hours by people who were not going to ring during their own working day, and a link in a reminder message catches them while the phone is already in their hand.
The numbers to pull once a week
- Available hours for the week, per technician and per bay
- Attended hours against available hours
- Clocked hours against attended hours, and what the difference went on
- Sold hours against clocked hours, by job type
- Booked hours for next week, checked on a Wednesday not a Friday
- Number of gaps, and the cause of each one
- No shows and late cancellations, as a count rather than a feeling
- Rework hours, kept separate from everything else
- Average invoice value, split by MOT, service and repair
- Declined advisories from the last three months, as a call list
Measure it before you buy anything to fix it
None of this needs software to start. A week of honest notes on a sheet will tell you which of the four gap causes you actually have, and the answer is usually not the one the workshop assumes.
Software earns its place once you know. If the problem is authority, quote approval is the fix. If it is no shows, deposits are. If it is a diary full of the wrong work, reminders and an open booking page change the mix. Buying all of it to solve one of them is how garages end up paying for a system they use a fifth of.
Youzse ships the workshop board, job cards with times on and off, online booking by registration, deposits, automated MOT and service reminders and online quote approval with photos. Garage plans start at £59 a month with a 30 day free trial and no card required.
Keep reading
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A cancellation two days out is recoverable and a gap on the day usually is not. Waitlists, standby lists and off-peak pricing for UK service businesses.
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What a garage job card must carry: registration, mileage, customer authority and spend limit, parts with part numbers, technician times and next due dates.
- Running your business
Garage invoice template
What a UK garage invoice needs: VAT invoice basics, labour and parts shown separately, part numbers, how the MOT test fee is treated and next due dates.