Guide
A simple lifetime-value sum, using your own job figures, tells you exactly how much you can afford to spend chasing a repeat booking versus a brand new one.
Most advice on customer value is vague: "repeat customers are worth more, invest in retention." True, but useless without numbers. If you don't know roughly how much a repeat customer is worth in your business, you can't decide whether a £180 loyalty postcard run, a reminder text, or a follow-up call is a good use of an afternoon. The maths below takes ten minutes with your own invoices and gives you a real figure.
The standard customer lifetime value formula gets complicated with discount rates and churn probabilities. For a small service business, you don't need that. You need three numbers you already have or can estimate:
The formula is:
LTV = average gross profit per job × jobs per year × expected years
The important part, and the one most people get wrong, is what you don't subtract. Acquisition cost is sunk the moment the first job is booked. It doesn't reduce the value of jobs two, three, and twenty. Once you've paid to win a customer, every job after that is nearly pure upside minus only the direct job costs. That's the whole point of retention economics: the second sale is cheaper to win and the value compounds.
Take a landscaper doing regular garden maintenance:
LTV = £190 × 8 × 3.2 = £4,864
Compare that to a handyman doing a one-off job at £220 gross profit, no repeat relationship. The gap isn't £190 versus £220. It's £4,864 versus £220 - a 22x difference. Even a landscaper with much lower retention, say 1.5 years and 5 visits a year, still nets £190 × 5 × 1.5 = £1,425. That's still more than six times the one-off job.
This is why "one-off" work should carry a premium if you can charge it, and why recurring maintenance contracts are worth chasing even at a slightly lower headline price. Check your own margins with the markup and margin calculator before you drop price to win a recurring deal - the volume needs to actually cover the discount.
If a repeat customer is worth 20x a one-off, it's rational to spend far more trying to keep one than you'd spend trying to win a brand new one. As a rough rule, businesses that track this tend to find it's sensible to spend 3-4 times more per customer on retention (reminders, loyalty pricing, service quality fixes, proactive rebooking) than on acquisition (ads, referral incentives, cold outreach) - because the retention pound is chasing a much bigger prize with a much higher chance of success.
That doesn't mean spend blindly. It means don't starve retention while pouring money into lead generation, which is the default mistake in most small service businesses.
Here's where the number gets practical. Suppose you run a modest retention effort this year: an automated rebooking reminder, a "we haven't seen you in a while" text, a small loyalty discount on the 5th visit. Total cost: £180 for the year (software, a bit of admin time, the discount itself).
Suppose it lifts average retention from 2.5 years to 3.2 years, on that same £190 gross profit, 8 visits a year landscaping customer:
| Scenario | Retention (years) | LTV |
|---|---|---|
| Before | 2.5 | £190 × 8 × 2.5 = £3,800 |
| After | 3.2 | £190 × 8 × 3.2 = £4,864 |
Lift per customer: £1,064. Cost of the effort: £180. Net return per customer roughly £884, and that's before you even count the fact that a small effort like this usually touches your whole customer base, not just one person. Spread the £180 cost across, say, 40 customers and the cost per customer is £4.50 against a £1,064 gain. That's the kind of arithmetic that should decide whether you send the reminder text, not gut feel.
You don't need software to get a working retention number. Pull last year's invoices or job list and do this:
This is a rough estimate, not an actuarial model, but it's close enough to set a sensible budget. Do it once a year and you'll see whether your retention efforts are actually moving the number or just feeling good.
Be honest about the ranges here. Retention length depends on local competition, whether the customer moves house, and how weather-dependent your trade is (a wet summer can wreck a landscaper's visit count for reasons that have nothing to do with service quality). Gross profit per job depends on material cost swings you don't set. Treat the £4,860 figure as a planning number, not a guarantee, and recalculate it whenever your material costs or job mix shift meaningfully.
Once you know your own LTV number, the follow-up budget decision gets simple: any retention activity costing less than roughly a third to a quarter of the LTV gain it produces is worth doing. Build the reminder, the loyalty step, the annual check-in call into your standard process rather than treating it as optional marketing. If you want a structured way to keep this consistent job after job, the small business operations kit has templates for exactly this kind of recurring customer workflow.
The Small Business Operations Kit ($19) turns guides like this one into fill-in-once worksheets: rate card, quoting sheet, job costing, payment terms and follow-up templates.