Defining CAC for trade services businesses
Customer acquisition cost in trade services is more complex to calculate accurately than in SaaS because the "first transaction" isn't always the right conversion event. A customer who calls for a drain cleaning, converts to an AMA on the second visit, and then refers three neighbors is a multi-touch acquisition story that a simple first-job CAC obscures.
The standard definition used throughout this article: total marketing and sales spend over a trailing 12 months, divided by the number of new customers acquired in that same period. "New customer" means a household or business that had zero prior service history with the operator. Existing customers who re-engage are not new customer acquisitions, even if the revenue is new.
This definition matters because it makes HVAC (high first-job call volume from new customers) look cheaper to acquire than electrical (lower first-job frequency), which means raw CAC comparisons across trades need to be normalized for customer lifetime value before drawing conclusions.
Blended CAC by trade and quartile
HVAC has the lowest blended CAC of the three trades because the high volume of seasonal inbound service calls creates more organic conversion opportunities per marketing dollar spent. HVAC operators who invest in seasonal paid search (April–May, September–October) capture inbound demand that converts at higher rates than cold outbound. Plumbing's blended CAC sits in the middle; the drain and sewer emergency market generates high-intent inbound calls, but the smaller ticket sizes relative to HVAC mean the payback period is longer for equivalent acquisition cost. Electrical's blended CAC is the highest because commercial project leads require longer sales cycles and the customer decision-making process is more complex (involving property managers, GCs, and facility directors rather than homeowners).
| Percentile | HVAC CAC | Plumbing CAC | Electrical CAC |
|---|---|---|---|
| Top quartile (P75+) | $95 – $140 | $120 – $175 | $180 – $280 |
| Median (P50) | $140 – $220 | $175 – $265 | $280 – $420 |
| Bottom quartile (P25) | $220 – $380 | $265 – $450 | $420 – $700+ |
Sample methodology: Data from 190+ trade services operators with confirmed marketing spend data. Includes digital (paid search, Meta, SEO), offline (direct mail, door hangers, local print), and referral program costs. Excludes trade shows and events (typically not material for residential service operators). Weighted toward PE-operated platforms (60%) and owner-operators (40%).
Channel-specific CAC benchmarks
Channel CAC is where the real optimization opportunity lives. Blended CAC tells you whether you're competitive. Channel CAC tells you where to invest the next dollar. The data below is for residential service channels; commercial channel data follows a different profile and is noted separately.
| Channel | Avg CAC (all trades) | Best-in-class CAC | Primary trade | Notes |
|---|---|---|---|---|
| Google Paid Search | $85 – $160 | $55 – $85 | HVAC, Plumbing | Highest intent; most competitive CPC |
| Meta (Facebook/Instagram) | $60 – $130 | $35 – $60 | All trades | Best for AMA conversion; longer path to first job |
| SEO / Organic | $20 – $60 | $15 – $25 | All trades | Highest ROI but 6–18 month build timeline |
| Referral / Word of mouth | $15 – $40 | $8 – $20 | All trades | Lowest CAC but can't scale beyond network effects |
| Door hangers / Direct mail | $90 – $180 | $60 – $90 | Plumbing, HVAC | Highest per-contact but localized efficiency |
| HomeAdvisor / Angi | $120 – $280 | $90 – $120 | All trades | High volume but high take-rate; margin compression |
CAC payback period targets
Payback period is the number of months it takes for a new customer to generate gross profit equal to the cost of acquiring them. It's a more operationally meaningful metric than CAC alone because it captures the cash flow reality of the acquisition — a $300 CAC with a 3-month payback is better than a $100 CAC with a 12-month payback for most operators.
The target for trade services businesses is under 6 months payback on blended CAC. Top-quartile operators hit 3–5 months. Anything above 9 months is a cash flow problem that requires either CAC reduction (channel optimization) or LTV improvement (membership conversion, upsell, referral program).
| Percentile | Payback Period | Implication |
|---|---|---|
| Top quartile (P75+) | 3 – 5 months | Cash flow positive on acquisition quickly; can scale spend |
| Median (P50) | 6 – 9 months | Acceptable but limits paid acquisition scaling without margin improvement |
| Bottom quartile (P25) | 10 – 18+ months | Acquisition is destroying cash; requires immediate channel review |
LTV:CAC ratios and what they mean
LTV:CAC is the canonical unit economics ratio for any acquisition business. In trade services, the LTV calculation requires capturing three components: (1) annual gross profit per customer, (2) average customer lifespan in years, and (3) membership/AMA contribution to LTV (AMA customers have 3–5x the LTV of non-contract customers). The blended LTV:CAC for trade services at P75 is 5.8× — which means every dollar spent on customer acquisition returns $5.80 in gross profit over the customer's lifetime.
A ratio below 3× is a warning signal; it means the business is either acquiring customers at too high a cost or failing to retain them long enough to recoup the acquisition investment. Most operators with LTV:CAC below 3× have a retention problem (low membership attach rate, poor first-call resolution generating callbacks and churn) rather than an acquisition problem.
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Complete channel CAC benchmarks, payback period data, and LTV:CAC ratios by trade and quartile. Spreadsheet format with formulas included.
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For PE operators benchmarking portfolio CAC
Portfolio-level CAC benchmarking is one of the highest-value analytics exercises for PE operators with three or more portcos. When you can compare CAC across portcos on the same channel mix, the variance is a direct signal of either marketing efficiency or customer quality differences.
A portfolio where one portco has $140 blended CAC and another has $290 blended CAC on the same channel mix means the high-CAC portco is either (a) paying too much for the same customers, (b) acquiring lower-quality customers who don't re-engage, or (c) running a suboptimal channel mix. All three are fixable within 90 days with the right playbook applied.