Calculate it correctly
Total spend divided by customers acquired, over a defined period.
Include everything: advertising, agency or contractor fees, tools and subscriptions, and a reasonable value for staff time spent on marketing and on handling enquiries. Businesses that exclude time consistently understate their real cost.
Calculate it by channel as well as overall. The overall figure tells you whether the business is healthy; the per-channel figures tell you what to change.
Compare it to what a customer is worth
A cost per acquisition means nothing on its own. The comparison is against customer lifetime value:
- Average first job value
- Average number of repeat jobs
- Referrals a typical customer generates
- Gross margin on all of it
A business with a $200 acquisition cost and $400 customers has a problem. The same acquisition cost against customers worth $2,000 over five years is cheap.
This is why measuring repeat rate matters: it changes what you can afford to pay.
The cheapest improvements are not in advertising
Working down the funnel usually beats buying more traffic:
Answer rate. Going from 70% to 95% of calls answered reduces acquisition cost by roughly a quarter with no additional spend. This is normally the single largest available gain.
Response time. Faster first contact converts more of the same enquiries.
Follow-up. Quotes already issued are the cheapest customers in the business. Systematic follow-up frequently improves close rate by several points.
Qualification. Not spending time on enquiries that were never going to convert increases capacity for the ones that will.
Price transparency. Publishing ranges means fewer wasted conversations and higher close rates on the enquiries that remain.
Each of these reduces the denominator problem without touching the spend.
Then improve the spending itself
- Cut channels whose cost per customer exceeds customer value — some are losing money at any volume
- Narrow geographic targeting to where you can actually serve profitably
- Bid on intent, not on volume — "emergency" and "near me" convert better than broad category terms
- Use negative terms to stop paying for searches that never convert
- Stop paying for brand traffic you would get free, unless competitors are bidding on your name
Raise customer value instead of cutting cost
The other side of the ratio is often easier to move:
- Maintenance agreements, which convert one-off customers into recurring revenue
- A second service offered to existing customers
- A referral request built into job completion
- Reactivation, which acquires a customer at almost no marketing cost
A business that doubles repeat rate has halved its effective acquisition cost without changing a single campaign.
Measure over a sensible window
Acquisition cost calculated monthly is noisy in a small business — a few large jobs distort it. Use a rolling three-month figure and watch the trend.
Also account for the lag. Spend in one month produces customers in later months, particularly for work with a long consideration period.
Frequently asked questions
What should be included in the calculation?
Advertising, agency or contractor fees, tools and subscriptions, and a reasonable value for staff time spent on marketing and handling enquiries. Excluding time consistently understates the real cost.
What should acquisition cost be compared against?
Customer lifetime value — first job value, repeat jobs, referrals generated, and gross margin on all of it. The same $200 acquisition cost is a problem against $400 customers and cheap against $2,000 customers.
Where is the largest available gain?
Usually answer rate. Moving from 70% to 95% of calls answered cuts acquisition cost by roughly a quarter with no additional spend at all.
What spending changes help?
Cutting channels that cost more per customer than a customer is worth, narrowing geographic targeting to where you serve profitably, bidding on intent rather than volume, and using negative terms.
Over what period should it be measured?
A rolling three months. A monthly figure is noisy in a small business because a few large jobs distort it, and spend produces customers in later months for work with a long consideration period.