The workshop numbers that actually decide something.

Turnover is the number that hides the most

A busy month and a profitable month are different things, and of all the workshop numbers, turnover is the one least able to tell them apart.

A workshop can grow turnover by taking more low-margin parts work, by discounting to fill bays, or by absorbing travel on mobile jobs, and every one of those looks like success in the headline figure while making the business worse.

The useful workshop numbers sit underneath it: what the time sold actually earned, and what proportion of available time was sold at all.

Sold hours against available hours

Of all the workshop numbers available, this is the closest thing to a single honest measure. It asks what share of the time you were paying for was actually charged to a customer.

It exposes things turnover conceals: technicians waiting on parts, jobs that took longer than quoted, gaps between bookings, and rework that nobody logged because it felt like a small favour.

The number is rarely as high as people expect, and the first time it is measured properly is usually uncomfortable. That discomfort is the point, because everything above it is recoverable revenue.

The gap between quoted and actual time

Track planned duration against real duration by job type and a pattern appears within weeks.

It is almost never general optimism. It is two or three job types where the estimate has been wrong for years, quietly consuming the schedule and the margin on every one of them.

Correcting those estimates is the cheapest operational improvement available, because nothing about how anyone works has to change. The schedule simply stops promising what the workshop cannot do.

Advisory work found, quoted, and converted

Work identified on a vehicle is revenue you have already paid to discover, and most workshops cannot say what happens to it.

• How much advisory work was identified this month.
• How much of it was actually quoted rather than mentioned verbally.
• How much converted, and over what period.
• Which job types produce advisories that convert and which do not.
• How much was never followed up at all, which is usually the largest of the five.

A workshop that improves only the middle two of those, without finding a single new customer, generally finds more revenue than any marketing it could have bought.

Customer return rate, measured honestly

New customers are expensive and returning ones are nearly free, so the proportion that come back is a better health measure than the count of new ones.

Measure it over a period that matches your work, since a service interval is a year and a tyre cycle is longer. A month is far too short to mean anything and a lifetime figure flatters an old business.

A falling return rate is an early warning that arrives long before turnover moves, which is exactly what you want from a number.

Margin by job type, not just overall

An overall margin figure averages away the thing you need to see, which is that some categories are carrying others.

Split it by job type and the picture usually changes. Tyre fitting, servicing, diagnostics, MOT preparation and parts supply have very different margin profiles, and a workshop can be growing the lowest-margin category fastest without anyone noticing.

The decision this changes is where to put capacity. A bay hour spent on the strongest category is worth measurably more than the same hour on the weakest, and once that gap is visible, scheduling and quoting priorities follow from it rather than from habit.

Fewer numbers, looked at more often

A report with forty figures gets read once. A report with five gets read every month, and only the second one changes anything.

The test for whether a number belongs is simple: name the decision it would change. If nobody can, it is being tracked because it is countable rather than because it matters.

That usually reduces workshop reporting to sold hours, quoted against actual time, advisory conversion, return rate and margin by job type. Five numbers, reviewed monthly, with someone accountable for each.