— Glossary
CPA
Cost Per Acquisition — what one closed customer costs.
What CPL pretends to be. Tracks all the way down the funnel: ad spend per actual paying job. The only number that matters for ROI.
CPA — Cost Per Acquisition — is the real-money KPI that connects marketing spend to booked, paying customers. For contractors, CPA can be measured as cost per won job, cost per paid invoice, or cost per customer who schedules and pays for a service. Unlike CPL, CPA folds in closing effectiveness, show rates, and average order value. A low CPL program that produces many unclosable leads still creates a high CPA because you won’t convert them. To calculate CPA, divide total acquisition-related ad spend by the number of closed deals attributable to that spend within your attribution window. For trades with long sales cycles, use a 90–180 day window and tie CRM deal-source tagging back to campaigns. Split CPA by service line: a tenant-improvement epoxy job’s CPA should be evaluated separately from one-off gutter cleanings. Also track backstage costs — estimation time, truck dispatch, travel — which inflate CPA in local services. Optimize CPA by improving landing pages, adjusting bid strategies for high-intent keywords, and tightening lead qualification. Profitability lives in CPA — manage it with discipline.
- An HVAC company spends $12,000 and closes 20 jobs from that spend, yielding a CPA of $600.
- A roofing lead gen campaign with low-quality leads shows $150 CPL but a $3,000 CPA after low close rates.
- A marine-service advertiser splits CPA: smaller detailing jobs have a $75 CPA, while restoration jobs show a $1,200 CPA.
Using CPL as a proxy for success; the mistake is ignoring closing costs and estimating time that make CPA the true profitability measure.
— CPA in practice
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