Ask most business owners what a customer is worth and they will tell you the size of the average job. That number is useful, but it is the wrong one for deciding how much to spend on marketing. The right one is what a customer is worth over the whole time they stay with you.
That is customer lifetime value, and it changes how almost every marketing decision looks.
The simple version
Customer lifetime value is your best estimate of the profit one customer brings in over the entire relationship, not just the first job. In the simplest form:
Average profit per job × jobs per year × years they stay with you = lifetime value
Take a furnace company. The average service call brings in a few hundred dollars of profit. A typical customer calls once a year and stays for around eight years, somewhere in that time buying a new furnace or air conditioner. Add it up and the "one-time" customer who booked a tune-up is worth several thousand dollars over the relationship. That is the number to keep in mind when you decide what you can afford to spend to win them.
It is an estimate, not a fact, and it moves as your prices, costs and customer behaviour change. It does not need to be precise to be useful.
Profit, not revenue
Use profit, not sales, or the number will flatter you. A customer who spends ten thousand dollars on jobs that cost you nine thousand to deliver is not a ten-thousand-dollar customer.
One-time value versus lifetime value
One-time value is the profit from a single transaction. Lifetime value includes every repeat job, every upgrade and, if you count it, every referral. For a business that gets repeat work, the two numbers are often five or ten times apart, and a business that only looks at the first one will underspend on marketing every time.
Should referrals count?
Yes, carefully. A customer who sends you two more customers over the years is worth far more than their own jobs, and referred customers usually cost nothing to acquire and stay longer. Track where new customers come from so you can see which ones refer, and factor that in when you decide how far to go to keep a good customer happy.
Why it matters for marketing
Once you know what a customer is worth, two decisions get much easier.
How much to spend to acquire one. If a customer is worth four thousand dollars over their lifetime, a lead that costs sixty dollars and converts one time in three is a bargain, even though it looks expensive next to the first job.
How far to go to fix a bad experience. Refunding a two-hundred-dollar service call to keep a four-thousand-dollar relationship is not generosity. It is arithmetic.
Where to start
Pull a year of invoices, work out the average profit per job and how often your customers come back, and you will have a rough lifetime value in an afternoon. Want to talk this through for your own business? Book a short discovery call. We'll hear how things work on your end and tell you straight whether we can help.
Originally published on methoddigital.ca, Feb 6, 2023 · Updated Oct 18, 2026.