Cost Per Acquired Customer for Home Service Businesses
Home service businesses spend $150–$350 per acquired customer on ads, then lose 62% of those leads when the phone goes unanswered. Here's how to calculate your real CAC — and cut it dramatically.
Most home service business owners think of marketing spend as the cost of getting a customer. Run ads, get calls, close jobs. The problem is that equation only works if you answer the calls. And at an industry-wide miss rate of 62%, that means for every 100 calls your marketing generates, 62 of them go unanswered — and you paid full price to generate every single one of them.
Your real cost per acquired customer (CAC) is not what your ad platform reports. It is what you actually spend per customer who books and pays. And when you factor in missed calls, that number is often 2–3x higher than most owners realize.
How to Calculate Your Real CAC
Standard CAC is simple: total marketing spend divided by customers acquired. But this calculation assumes you're converting every lead you generate. For home service businesses, you're not — and that gap massively distorts your true acquisition cost.
Real CAC Formula
Reported CAC = Marketing spend ÷ Customers acquired Real CAC = Marketing spend ÷ (Calls generated × Answer rate × Close rate) Example: $5,000/month spend → 100 calls generated → 62% answered → 40% close rate = 24.8 customers acquired = $201 reported CAC But if you answered 100% of those calls: 100 calls × 40% close = 40 customers = $125 real CAC — 38% lower
In other words, every missed call inflates your CAC. The money you spent generating that lead is wasted. If you could simply answer more of the calls your marketing already generates, you'd acquire more customers without spending an extra dollar on ads.
CAC by Trade: Industry Benchmarks
Here are typical CAC figures across home service trades, using Google Local Services Ads and Google Search as the primary channel. These represent reported CAC — before accounting for missed calls.
| Trade | Avg Reported CAC | At 62% Answer Rate | Real CAC | CAC with 100% Answer |
|---|---|---|---|---|
| HVAC | $180 | 62% | $473 | $180 |
| Plumbing | $160 | 62% | $421 | $160 |
| Electrical | $145 | 62% | $382 | $145 |
| Roofing | $310 | 62% | $816 | $310 |
| Pest Control | $95 | 62% | $250 | $95 |
| Landscaping | $120 | 62% | $316 | $120 |
| Cleaning | $85 | 62% | $224 | $85 |
The Answering Service Effect on CAC
When you install an AI answering service and bring your answer rate from 38% to 95%+, your CAC drops dramatically — without changing your ad spend at all. You're simply converting more of the leads you already paid to generate.
For a plumbing business spending $3,000/month on Google Ads generating 50 calls: at 38% answer rate and 40% close, they book 7.6 jobs at a $394 CAC. After CallJolt, at 95% answer rate and 40% close, they book 19 jobs at a $158 CAC. Same ad spend. Same calls. 150% more jobs. CAC cut by 60%.
CAC vs. Lifetime Value: The Ratio That Matters
CAC is only meaningful when compared to customer lifetime value (CLV). For home service businesses, a customer who initially hires you for a $400 job may return 3–4 times over 5 years and refer 1–2 additional customers. The LTV of a well-served home service customer is typically $1,200–$3,500. If your CAC is $200, you have a 6–17x LTV:CAC ratio — excellent. If your real CAC is $394 because of missed calls, your ratio drops to 3–9x — still acceptable, but leaving enormous margin on the table.
- Benchmark LTV:CAC ratio for healthy home service business: 5:1 or better
- Below 3:1: acquisition economics are stressed — optimize answer rate first, then ad spend
- Above 10:1: room to scale ad spend aggressively — but only if your answer rate supports it
- Every 10% improvement in answer rate reduces CAC by approximately 10% at constant ad spend
| High Miss Rate Business | High Answer Rate Business |
|---|---|
| CAC: $394 (at 38% answer rate) | CAC: $158 (at 95% answer rate) |
| Books 8 jobs from $3K ad spend | Books 19 jobs from same $3K ad spend |
| LTV:CAC ratio: 3–4x | LTV:CAC ratio: 8–22x |
| Scaling ads makes CAC problem worse | Scaling ads amplified by high answer rate |
| Marketing ROI is poor | Marketing ROI is exceptional |
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Frequently Asked Questions
How does answering the phone affect my customer acquisition cost?
Answering the phone converts more of the leads your marketing already generates. If you spend $5,000/month on ads and answer 38% of calls, you are wasting 62% of your lead spend. By answering 95%+ of calls with an AI answering service, you get significantly more customers from the same ad spend — which directly lowers your CAC without reducing marketing investment.
What is a good CAC for an HVAC business?
For HVAC businesses using Google Ads, a CAC of $150–$250 is generally considered healthy when paired with a customer lifetime value of $1,500–$4,000. If your CAC exceeds $400, investigate your answer rate first — it is the most common and most fixable cause of elevated CAC in home service businesses.
Should I reduce my ad spend or improve my answer rate first?
Almost always, improve your answer rate first. Reducing ad spend cuts your lead volume and customer count. Improving your answer rate gets you more customers from leads you're already paying for. Fix the conversion leak before you adjust the water pressure. An AI answering service costs $149–$349/month; reducing ad spend by $1,000/month means fewer leads coming in.
How do I track whether CallJolt is lowering my CAC?
Track your marketing spend and booked jobs month-over-month. If your ad spend is flat but booked jobs increase after installing CallJolt, your CAC dropped. The CallJolt dashboard shows you exactly how many jobs were booked from calls it answered, so you can isolate the impact precisely.
Does call answering rate affect my Google Local Services Ads performance?
Yes, significantly. Google LSA's algorithm rewards businesses with high answer rates and strong booking rates. If you're missing calls from LSA leads, Google's system will reduce your ad ranking and increase your cost-per-lead over time. Maintaining a high answer rate keeps your LSA account in good standing and your cost-per-lead lower.
What Service Business Owners Are Saying
“I was missing 8-10 calls a week and didn't even know it. CallJolt fixed that in one afternoon. It's the best $149 I spend every month.”
“My guys are on job sites all day. Having an AI that answers, takes the info, and texts me the summary is exactly what I needed. Highly recommend.”
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