Definition
Customer acquisition cost, often called CAC, connects customer-growth spending with the number of new customers gained. It helps a cleaning company evaluate channels such as referrals, local advertising, partnerships, and sales activity, provided costs and customer counts are assigned to the same period and definition.
In Practice
Hypothetically, a company spends $3,000 during a quarter on trackable advertising, sales commissions, and campaign software, and acquires 30 new paying customers attributable under its stated rules. Its CAC is $100. The owner compares that figure with expected contribution from those customers over time, rather than treating the first booking’s revenue as the whole return.
How to Calculate
Operational Impact
What costs to include
The numerator should follow a documented policy. It may include advertising spend, agency fees, sales commissions, promotional materials, referral rewards, and the relevant portion of sales and marketing payroll or tools. It generally should not silently include unrelated operating costs such as cleaners’ wages. A narrower campaign CAC can be useful too, but it must be labeled so it is not compared as though it were a fully loaded companywide CAC.
Who counts as a new customer
Use a meaningful event, commonly a first paid service, rather than a raw inquiry or quote request. A lead that never books is not an acquired customer. Count the customer entity—not each property—as the acquisition unless the company has explicitly defined separate buyers or accounts. A current customer adding a second property is therefore normally an expansion, not another new customer. Document how returning customers and introductory jobs that are refunded or canceled are handled. Clear counting rules make the denominator credible and keep teams from optimizing for low-quality signups.
Interpreting the calculation
In the hypothetical quarter, $3,000 divided by 30 equals $100 per new customer. That is an average, not the cost of each person. One referral may cost little while a paid-search customer costs more. Segmenting by lead source, service type, or geography can reveal differences, but small samples can swing sharply and should not be treated as proof that a channel has permanently changed.
Relationship to conversion and retention
CAC rises when spending increases or when fewer leads become customers. Improving lead conversion can reduce acquisition cost without cutting visibility, while retention affects whether an acquisition has time to pay back. A cheap first booking is not necessarily valuable if the customer never returns; conversely, a higher CAC can be rational for a customer segment with a durable, profitable relationship.
Organic and blended acquisition
Customers who arrive through unpaid search, repeat word of mouth, or owner networking still may consume labor and tools even when no advertising invoice exists. A blended CAC spreads the company’s defined acquisition costs across all new customers, while channel CAC assigns attributable costs and customers to one source. Reporting both can prevent a seemingly inexpensive channel from receiving credit for demand created elsewhere.
Caveats for decision-making
Sales cycles create timing mismatches: a campaign paid this month may produce customers later. Attribute costs and customers over a sensible period, and avoid claiming false precision from incomplete tracking. CAC does not include service delivery profitability on its own, so evaluate it alongside job costing, gross margin, and customer lifetime value. The aim is informed channel decisions, not the lowest possible acquisition number.