How do you calculate customer acquisition cost for a home services business?
Divide fully loaded marketing spend by the number of genuinely new customers acquired in the same period — not leads, not jobs, and not repeat callers. Two things break the number in practice: counting existing customers as new because they came through a tracked channel, and leaving out costs that are not media, such as management fees, call tracking, creative and the software that runs the funnel.
A new customer is not the same thing as a new job
In home services the same household can generate several jobs a year and several jobs can belong to one acquisition event. If your denominator is jobs, your acquisition cost will look far better than it is, because repeat work from customers you acquired years ago is quietly padding the count.
Define a new customer as one with no prior invoice in your system, ever — not no invoice this year. That definition depends on customer records being deduplicated across phone number, address and name, which is usually where the real work sits. Customer intelligence work almost always starts by fixing this.
The three denominators people confuse
- Leads. Cost per lead. Cheapest to produce, weakest signal, and defined differently by every platform you use.
- Jobs. Cost per booked job. Right for judging a campaign against job-level margin, wrong for judging acquisition.
- New customers. True acquisition cost. Right for judging the marketing operation and for any conversation involving lifetime value.
Marketing CAC and sales-and-marketing CAC
Some operators include the cost of the people who convert the lead — call center wages, in-home sales commissions — and some do not. Both are defensible. Mixing them is not. If you include sales labor, say so on the report, because a company with a commissioned in-home sales team and one selling over the phone will produce very different numbers from the same media spend.
The practical rule: keep one media-only figure for comparing channels and one fully loaded figure for judging the business. Consistency matters more than which convention you pick.
Where the number quietly inflates
Repeat customers who call a tracked number, existing customers clicking a branded search ad, and warranty callbacks routed through a lead form all look like acquisitions to an ad platform. None of them are. Separating them requires matching the inbound contact back to customer history before counting, which is a job for the integration layer rather than the ad account.
Once that separation exists, most operators discover their true acquisition cost is meaningfully higher than reported, and that a portion of paid spend has been buying customers they already had.
A useful sanity check: your count of new customers in a period should never exceed the count of first-ever invoices in the same period. When it does, the difference is duplicate customer records, and every acquisition metric you report is understated until they are merged.
Topics: CAC · new customers · marketing spend · measurement
Have a version of this question about your own business?
The useful answer usually depends on which systems you run and how they're connected. That's a conversation, not a blog post.