Lead-cost arithmetic for Kitchener home-service owners

The one number you need

The answer: your maximum cost per lead is roughly your average ticket, times your close rate, times your gross margin, with a safety buffer taken off.

In plain terms, it answers the question: if I pay this much for an enquiry, and win some of them, do I still make money after the cost of doing the job?

You need three inputs:

1. Average ticket: the average invoice for the type of job you're marketing.
2. Close rate: the share of enquiries that become paid jobs.
3. Gross margin: the share of the invoice left after direct costs such as labour, materials and subcontractors.

Worked example one: a plumbing service call business

Say a Kitchener plumbing company markets drain and repair calls.

• Average ticket: $450
• Close rate: 60% (emergency callers usually book)
• Gross margin: 45%

Revenue per lead = $450 × 0.60 = $270. Margin per lead = $270 × 0.45 = $121.50.

So $121.50 is the break-even point: pay that per lead and the marketing makes nothing. A sensible ceiling might sit at half to two-thirds of it, roughly $60 to $80 per lead, to leave room for overheads and profit.

Worked example two: a landscaping company in the new subdivisions

Now a landscaper targeting new homeowners in Kitchener's south end.

• Average first job: $4,000
• Close rate: 25% (many owners get several quotes)
• Gross margin: 35%

Revenue per lead = $4,000 × 0.25 = $1,000. Margin per lead = $1,000 × 0.35 = $350.

Even a cautious ceiling of $150 to $200 per lead leaves this business well ahead. That is why landscaping and renovation companies can afford channels that would ruin a low-ticket trade.

Worked example three: adding repeat business

Some trades earn most of their profit after the first job. Say a furnace and air-conditioning company sells maintenance plans.

• First job: $350 tune-up, 40% margin, so $140 margin
• Customers who stay: 60% sign a plan worth $250 a year at 50% margin, kept for an average of four years

Expected lifetime margin from repeat work: 0.60 × $250 × 0.50 × 4 = $300. Total margin per customer: $140 + $300 = $440.

With a 50% close rate, each lead is worth about $220 in lifetime margin. The first-job maths alone would say $70. This is why retention matters so much in our new-subdivision service, and why recurring-service trades can outbid one-off competitors and still profit.

Turning the ceiling into decisions

Once you have the ceiling, every channel is judged the same way. Divide what you spent by the leads it produced, and compare the result with your ceiling.

These are illustrative figures, not benchmarks. Your table will differ, but the method doesn't.

Two rules keep this honest:

• Count all-in cost. Include management fees, not just ad spend. Our plan fees are published on the pricing page so you can do this precisely.
• Count qualified leads only. A wrong number, a job-seeker or a request for a service you don't offer isn't a lead.

The other side: what you do with a lead

The ceiling assumes your close rate stays the same. In practice, how your office handles enquiries changes the maths as much as any ad.

If the plumbing company above lifts its close rate from 60% to 70% by answering faster and following up on quotes, the value of each lead rises from $121.50 to about $142 in margin. The same marketing becomes more profitable without spending another dollar.

The quickest improvements are usually:

1. Answer or text back fast. Homeowners often call two or three companies; the first to respond often wins.
2. Follow up on quotes. A friendly check-in a few days later wins jobs that would otherwise drift.
3. Track the reason for every lost quote. Price, timing and trust problems each have a different fix.

Mistakes that wreck the arithmetic

These errors make marketing look better or worse than it really is:

• Using revenue instead of margin, which makes almost any channel look profitable.
• Mixing job types, so one big renovation hides twenty unprofitable service calls.
• Forgetting the fee, counting only ad spend in the cost per lead.
• Judging too soon, after a week of data or a handful of leads.
• Not logging the source, so you can't tell which channel produced which job. Ask every caller how they found you, and write it down.

A one-page worksheet

Copy these lines onto a single sheet and fill them in for each service you market. Keep it beside the phone or pinned in the office.

1. Service: ______
2. Average ticket for this service: $______
3. Close rate on enquiries for this service: ______%
4. Gross margin on this service: ______%
5. Revenue per lead (line 2 × line 3): $______
6. Margin per lead (line 5 × line 4): $______
7. Lifetime margin from repeat work, if any: $______
8. Break-even cost per lead (line 6, plus line 7 × line 3): $______
9. Working ceiling (line 8 × 0.5 to 0.66): $______

Review the sheet every quarter. Prices change, crews change and close rates drift, especially after a slow season. A ceiling that was right last spring can be wrong by fall.

Put it to work

Fill in your own three inputs, calculate the ceiling, and hold every channel to it. Our search-ads service is built around exactly this sheet, and the service-area guide helps you decide where to spend once you know your number. If you'd like a second pair of eyes on the arithmetic, call, text or email and we'll go through it with you in the free first consultation.