Service business customer lifetime value, including referrals

Aug 18
3 min read

Updated: 5 days ago

Introduction

Service businesses usually judge a new client against the value of the first job. That understates the relationship substantially, because good clients return and — more importantly in this sector — introduce others.

Calculating the fuller figure changes what you can rationally spend to win a client.

The general method is in how to calculate customer lifetime value; this covers what is specific to project-based work.

1. Calculating service business customer lifetime value

Three inputs from your own records.

Average job value. What a typical engagement bills.

Jobs per client. How many engagements a typical client commissions over the relationship.

Gross margin. Job value minus direct delivery costs — labour at a realistic loaded rate, materials, travel, and the unpaid time spent quoting and administering.

Multiply the three. A client commissioning three $4,000 projects at a 40% margin produces $4,800 in gross profit, not the $1,600 the first job suggests.

2. Include the quoting cost, including for jobs you lost

This is specific to service work and usually omitted.

Winning a client involves quoting, and some of that quoting produced nothing. If you win one in three quotes, the true acquisition cost of a client includes the two unpaid proposals that did not convert.

Include it, or your acquisition cost will look considerably better than it is — and this is often the largest hidden cost in a service business.

3. Add referral value, conservatively

For most service businesses referrals are the main growth channel, which means a good client is worth more than their own spending.

Estimate it: of your clients, what proportion produce at least one referral, and what is a referred client worth? Even a modest assumption adds meaningfully, and it explains why client experience deserves more investment than acquisition in this sector.

Estimate conservatively from actual records rather than impressions. If you have been recording where clients came from, the data exists.

4. Segment by client type, not just by size

Blended figures mislead badly in service work, because client behaviour varies more than in most sectors.

Some clients commission once and disappear. Some return annually. Some refer constantly. Some consume enormous amounts of unbilled attention and never return.

Segment by type and calculate separately. The most profitable segment is frequently not the one with the largest individual jobs, which is worth knowing before deciding who to pursue.

5. Use it to set an acquisition ceiling

Divide gross-profit lifetime value by three for a working maximum cost per client.

A client worth $4,800 in gross profit, plus a conservative referral contribution, supports a materially larger acquisition cost than the first project alone implies. Advertising, a paid directory or a partner arrangement that looked unaffordable against one job may be comfortably profitable against the relationship.

6. Repeat work is the cheapest lever

Of the three inputs, jobs per client is usually easiest to move and has the largest effect.

Raising average engagements per client from two to three lifts lifetime value by half, with no new acquisition. The mechanism is unglamorous: close projects properly, diarise the next contact before you stop, and stay in touch usefully.

Most service businesses complete a project and go quiet, which is where the value leaks.

7. Fire the negative-value clients

The calculation occasionally produces an uncomfortable answer: some clients contribute negative gross profit once unbilled time is counted.

Identify them. Then either reprice, restructure how they are served, or let them go. Retention effort spent on these is effort not spent on clients worth keeping, and being deliberate here is what makes the whole exercise worthwhile.

Conclusion

Multiply average job value by jobs per client by gross margin, include the cost of unsuccessful quotes, and add a conservative referral estimate.

Segment by client type rather than size, set your acquisition ceiling at roughly a third of the result, concentrate on increasing repeat engagements, and identify the clients who cost more than they contribute.