Marketing KPIs for Trades: CAC, LTV & ROAS
Most trades businesses fly blind. They know roughly what came in this month, but not what it costs to win a customer, what that customer is worth over time, or which channel actually pays. This guide defines the marketing KPIs that matter for a trade, cost per lead, customer acquisition cost, conversion rate, answer rate, customer lifetime value and return on ad spend, with the formulas to calculate each, channel benchmarks drawn from sources such as WordStream, and a minimum dashboard you can maintain in a spreadsheet. Measure these few numbers and marketing stops being a gamble and becomes a decision.
Ask most tradespeople how their marketing is doing and you will hear a feeling, not a figure: "busy enough", "the ads seem alright", "Google brings a few in". That instinct is valuable, but it is not a number, and you cannot improve what you do not measure. The businesses that grow predictably are the ones that know what a customer costs to win, what that customer is worth over time, and which channel actually pays.
None of this requires an accountant or a fancy tool. It requires a handful of definitions and a spreadsheet. This guide defines the marketing KPIs that matter for a trade, gives you the formula for each, sets them against real benchmarks from sources such as WordStream, and lays out a minimum dashboard you can maintain in twenty minutes a month. Get these few numbers in front of you and marketing stops being a gamble and becomes a decision.
Why Measurement Beats Instinct
Instinct tells you whether you feel busy. It does not tell you whether you are profitable, or which of your marketing efforts deserve more money and which are quietly losing it. Two trades businesses can take the same revenue while one is thriving and the other is one slow month from trouble, and the difference is almost always whether they understand their numbers.
Measurement turns vague worry into specific action:
- It shows which channel brings the most profitable work, not just the most calls.
- It reveals where you are leaking money, often at the final step, the unanswered call.
- It tells you how much you can afford to spend to win a customer, which unlocks confident growth.
- It replaces "marketing is an expense" with "marketing is an investment with a known return".
This is core operations work, and it sits alongside the broader shift covered in digital transformation for trades businesses. You do not need every metric. You need the right few, understood properly.
The Core KPIs, Defined
Here are the metrics that actually run a trades business, with what each one tells you.
Leads generated
The count of genuine enquiries in a period, by channel. The raw top of your funnel. On its own it means little, but it is the denominator for almost everything else.
Cost per lead (CPL)
What each enquiry costs you to generate.
CPL = total spend on a channel ÷ number of leads from that channel
If Google Ads cost £600 and produced 30 enquiries, your CPL is £20. Judged alone, a CPL is neither good nor bad; it only means something against conversion and customer value.
Conversion rate
The share of leads that become paying jobs.
Conversion rate = jobs won ÷ leads received
If 30 leads produced 9 jobs, your conversion rate is 30%. This is where follow-up and speed-to-lead do their work, as covered in lead follow-up for trades businesses.
Answer rate
The proportion of inbound calls you actually answer. For trades this is disproportionately important, because an unanswered call is usually a lost job. The real cost of missed calls quantifies the leak.
Customer acquisition cost (CAC)
The full cost of winning one new customer, including the leads that did not convert.
CAC = total marketing and sales spend ÷ new customers won
If £1,000 of spend won 10 customers, CAC is £100. CAC is the number you compare against value.
Customer lifetime value (LTV)
The total profit a customer brings across the whole relationship, not just the first job.
LTV ≈ average job value × jobs per customer over time × margin, plus referral value
For trades, LTV is often far larger than the first invoice because of repeat work and referrals, the theme of customer aftercare and repeat revenue and the engine behind email marketing for trades businesses.
Return on ad spend (ROAS)
Revenue generated per pound of advertising.
ROAS = revenue from ads ÷ ad spend
£500 of ads producing £2,500 of work is a ROAS of 5 (5:1). Use it to steer ad budgets, as in the Google Ads for trades guide.
The Formulas in One Place
| KPI | Formula | Worked example |
|---|---|---|
| Cost per lead | Spend ÷ leads | £600 ÷ 30 = £20 |
| Conversion rate | Jobs won ÷ leads | 9 ÷ 30 = 30% |
| Answer rate | Calls answered ÷ calls received | 80 ÷ 100 = 80% |
| Customer acquisition cost | Total spend ÷ new customers | £1,000 ÷ 10 = £100 |
| Lifetime value | Avg job value × jobs per customer × margin (+ referrals) | £600 × 4 × 0.4 = £960 (+ referrals) |
| Return on ad spend | Revenue from ads ÷ ad spend | £2,500 ÷ £500 = 5:1 |
| LTV:CAC ratio | LTV ÷ CAC | £960 ÷ £100 = 9.6:1 |
The LTV:CAC ratio is the one number that ties it all together. It tells you whether your marketing economics are healthy: broadly, you want lifetime value to comfortably exceed acquisition cost. A ratio that is very low means you are paying too much to win customers worth too little; a ratio that is very high can mean you are under-investing and leaving growth on the table.
Channel Benchmarks and How to Read Them
Benchmarks are context, not targets. Your own numbers, tracked over time, matter far more than any published average. But context helps you sanity-check, and the most-cited source for paid-search benchmarks is WordStream.
A few directional reference points from WordStream's cross-industry Google Ads analysis:
- An average cost per lead across all industries in the region of $70, with home and home-improvement among the more expensive and competitive categories.
- Conversion rates in home services that sit in the mid-single-digit-percent range for paid search, varying widely by query and locality.
- Cost per click in home-improvement that runs notably above the cross-industry average, reflecting competitive bidding.
| Channel | Typical strength | Watch this metric | Benchmark source |
|---|---|---|---|
| Google Ads (paid search) | Fast, high-intent leads | CPL, conversion rate, ROAS | WordStream Google Ads Benchmarks |
| Local SEO / Google Business Profile | Durable, low marginal cost | Leads, conversion rate | Your own tracking |
| Reviews and referrals | Highest trust, lowest CAC | CAC, LTV | Your own tracking |
| Email to past customers | Cheapest repeat revenue | LTV, revenue per send | Your own tracking |
Two cautions when reading any benchmark. First, currency and market differ: most published figures are US dollars and US data, so treat them as directional for the UK, not exact. Second, a "high" cost is only a problem relative to value, a £60 lead that reliably becomes a £4,000 job with strong repeat potential is a bargain. Always read a benchmark through the lens of your own LTV:CAC.
The Minimum Dashboard
You do not need software. A single spreadsheet, updated monthly, covers the decisions that matter. Track these rows, broken down by channel where you can:
- Leads generated (by channel)
- Spend (by channel)
- Cost per lead (spend ÷ leads)
- Jobs won (by channel)
- Conversion rate (jobs ÷ leads)
- Answer rate (calls answered ÷ received)
- Revenue and a rough margin
- Customer acquisition cost (total spend ÷ new customers)
Add lifetime value and ROAS once the basics are habitual. A simple monthly layout:
| Channel | Leads | Spend | CPL | Jobs | Conv. % | Revenue |
|---|---|---|---|---|---|---|
| Google Ads | 30 | £600 | £20 | 9 | 30% | £18,000 |
| Local SEO / GBP | 25 | (time) | low | 10 | 40% | £22,000 |
| Referrals | 12 | nil | nil | 9 | 75% | £20,000 |
| Email (past customers) | 8 | small | low | 6 | 75% | £9,000 |
The figures above are illustrative placeholders to show the shape of the table, not claims about any real business; fill it with your own. Even a month or two of honest data usually reveals something actionable: a channel that looks busy but converts poorly, a CAC that is uncomfortably close to a job's value, or, most often, an answer rate that is quietly bleeding paid-for leads. A CRM makes this far easier by capturing the data automatically, but a spreadsheet and discipline are a perfectly good start.
Turning Numbers Into Decisions
Metrics are worthless until they change what you do. The point of the dashboard is the conversation it prompts each month:
- CPL high and conversion low on a channel? The leads may be poor quality, or your follow-up is weak. Tighten targeting or fix lead follow-up.
- Answer rate low? You are paying for calls you never take. This is usually the single highest-ROI fix available, addressed in the real cost of missed calls.
- CAC creeping towards job value? Either lift value through repeat work and referrals, or cut the least efficient channel.
- One channel quietly outperforming? Move budget towards it with confidence, because now you have proof, not a hunch.
- Conversion stubbornly low despite good leads? Your trust signals may be the weak point; revisit reputation and crisis management and the visual proof in video and before-and-after photos for trades.
This is the discipline that separates a trades business that grows on purpose from one that grows by luck. For sector-specific context, the guides for plumbers, electricians and small construction firms put these numbers in a wider plan, alongside the trades directory, the glossary, and the blog.
Conclusion
You cannot improve what you do not measure, and most trades businesses measure nothing beyond the bank balance. The fix is not complicated. Learn the handful of KPIs that matter, cost per lead, conversion rate, answer rate, customer acquisition cost, lifetime value and return on ad spend, apply the simple formulas, read them against benchmarks with a sceptical eye, and keep a one-page monthly dashboard.
Do that, and three things change. You stop guessing which marketing works. You find the cheap growth hiding in your answer rate and your repeat customers. And you gain the confidence to invest, because for the first time you know exactly what a customer costs and what one is worth. That is the difference between marketing as a gamble and marketing as a decision.
We answer before we start
Q/01What is customer acquisition cost (CAC) and how do I calculate it?
Customer acquisition cost is the total cost of winning one new customer. You calculate it by adding up everything you spent on marketing and sales over a period, then dividing by the number of new customers that spend produced. For example, if you spent £1,000 on Google Ads and your time chasing leads over a month and won 10 new customers, your CAC is £100. The number only means something when you compare it to what a customer is worth: a £100 CAC is excellent if a customer is worth £2,000 over time, and ruinous if they are worth £80. Track CAC by channel where you can, so you can see which sources of work are genuinely profitable rather than just busy.
Sources & resourcesQ/02What is customer lifetime value (LTV) for a trades business?
Lifetime value is the total profit you expect from a customer across the whole relationship, not just the first job. For trades this is often dramatically larger than the first invoice, because a satisfied customer comes back for servicing, future projects and, crucially, refers others. A simple estimate is average job value multiplied by the number of jobs a typical customer gives you over the years, plus the value of referrals they generate. A homeowner whose first job is a £400 repair might be worth several thousand pounds once you count repeat work and the neighbours they send your way. LTV matters because it tells you how much you can sensibly afford to spend to win a customer, which is the whole basis of profitable marketing.
Sources & resourcesQ/03What is a good cost per lead for a UK trades business?
There is no universal figure, because it varies enormously by trade, location and channel, but benchmarks give useful context. WordStream's analysis of Google Ads across industries has reported an average cost per lead in the region of $70 across all sectors, with home and home-improvement among the more expensive and competitive categories. In UK pounds and for high-value trades, a cost per lead anywhere from £20 to £80 or more can be perfectly profitable, provided the customer's lifetime value justifies it. The right question is never "is this cost per lead high?" in isolation, but "does this cost per lead, given my conversion rate and customer value, leave me with a healthy margin?" Always judge it against CAC and LTV, not on its own.
Sources & resourcesQ/04What is ROAS and how is it different from ROI?
ROAS, return on ad spend, measures the revenue generated for each pound spent on advertising. If you spend £500 on ads and they produce £2,500 of booked work, your ROAS is 5, often written 5:1. It is a quick, channel-level gauge of whether advertising is pulling its weight. ROI, return on investment, is broader: it accounts for the actual profit after delivering the work and all costs, not just revenue, and can cover marketing beyond advertising. ROAS is the faster operational number you watch on a campaign; ROI is the truer measure of whether the business made money. A high ROAS on a low-margin job can still be a poor outcome, so use ROAS to steer ad spend and ROI to judge the business.
Sources & resourcesQ/05What is answer rate and why does it matter so much for trades?
Answer rate is the proportion of inbound calls your business actually answers. It matters more for trades than almost any other metric because tradespeople are often on the tools and physically cannot pick up, and an unanswered call from a homeowner is usually a lost job, as they simply ring the next result. A low answer rate quietly wastes every pound you spend generating the call in the first place: you pay for the lead, then drop it at the final step. Tracking answer rate, and the revenue lost to missed calls, often reveals the cheapest growth available to a trade is not more leads but answering more of the ones it already gets, through call handling, text-back or an AI receptionist.
Sources & resourcesQ/06What is the minimum set of metrics a small trades business should track?
You do not need a complicated dashboard. Six numbers cover most decisions: leads generated (how many enquiries came in), cost per lead (what each enquiry cost), conversion rate (what share of leads became jobs), answer rate (how many calls you actually answered), customer acquisition cost (what a new customer cost to win), and revenue with a rough margin (what it all produced). Track these monthly in a simple spreadsheet, broken down by channel where you can. That is enough to see which marketing pays, where you are leaking money, and what to do more or less of. Add lifetime value and return on ad spend as you grow, but those six will already put you ahead of most competitors who track nothing at all.
Sources & resources
