Almost every conversation about marketing for a local service business starts in the same place. I need more leads.
It is usually the wrong request, and the reason is that almost nobody asking it can say how many more. Not a feeling, a number. Without that number there is no way to tell whether a marketing spend is working, whether a lead source is priced fairly, or whether the problem is leads at all.
The number is not hard to find. It is four pieces of arithmetic in reverse.
Work backwards from the goal
Start with what you want to earn, not what you want to spend.
Say you want $300,000 in revenue next year. Your average job is worth $600. That means you need 500 jobs, which is about 42 a month.
Now the part most people skip. Not every lead becomes a job. If you close 30% of the leads you get, then 42 jobs a month requires 140 leads a month. If you close 50%, it requires 84.
That is the whole calculation. Revenue goal, divided by average job value, divided by close rate. Four numbers and you know what you are actually asking marketing to produce.
Where it falls apart
The math is trivial. Having the inputs is not.
Most owners can estimate revenue and most can estimate average job value, though it is usually less accurate than they think because a handful of large jobs pull the average away from the typical one. The median job is often the more useful figure.
Close rate is where it collapses. Very few local service businesses know theirs, because knowing it requires counting leads, which requires noticing them, which requires a place they get written down. If leads arrive as missed calls, texts to a personal phone, and form submissions to an inbox, there is no denominator and there is no close rate.
Industry benchmarks are worth something here as a sanity check, but treat them carefully because the definitions vary wildly. Aggregate figures put lead-to-customer conversion in home services around 7.8% overall, with plumbing and similar urgent trades closer to 12 to 16% and higher-ticket work like roofing and remodeling down in the 3 to 7% range. Meanwhile close rates on high-intent phone calls are reported as high as 46%. Those numbers are not in conflict. They are counting different things, one starting from every inquiry including cold web forms and the other from someone with a real problem calling you directly.
Which means a benchmark only helps if you know which kind of lead you are counting.
The lever most people ignore
Look at the calculation again. There are two ways to get more jobs, and only one of them costs money.
At 30% close rate, 42 jobs needs 140 leads. Move to 40% and the same 42 jobs needs 105. That is 35 fewer leads a month for the same revenue, and at a home services cost per lead of roughly $66 to $91 depending on which benchmark you use, it represents real money not spent.
Improving conversion is almost always cheaper than buying volume, and there are two places it usually hides.
The first is answering the phone. Invoca's 2026 home services data puts the share of calls answered by a person at 52%, rising to 73% for calls that last more than thirty seconds. Every unanswered call is a lead you already paid for and then discarded.
The second is speed. Response time has an outsized effect on whether a lead converts at all, with the well-known MIT and InsideSales research on five-minute response windows and more recent home services data suggesting responses inside a minute can lift conversion dramatically. A lead that sits for four hours has usually already called somebody else.
Cost per lead is the wrong number
One more piece of arithmetic worth internalizing, because it is how lead vendors get away with looking cheap.
A $50 lead that you close 8% of the time costs you $625 per paying customer. A $90 lead that you close 20% of the time costs you $450. The cheaper lead is nearly 40% more expensive per actual job.
That gap is usually the difference between a shared lead sold to four other contractors and an exclusive one that came to you directly. Cost per lead hides it completely. Cost per booked job does not.
So if you take one number from this, make it that one. What did it cost to get one paying customer, and what is that customer worth to you.
What to do this week
Pick a place, any place, where every inbound inquiry gets written down. A notebook works. A spreadsheet works. What matters is that in ninety days you have a denominator.
Then run the arithmetic. Revenue goal, average job value, close rate. It takes ten minutes and it converts a vague request for more leads into a specific target you can hold a marketing decision against.
The businesses that grow predictably are not the ones spending the most. They are the ones who know what number they are trying to hit.