Your Next Client Is Already Inside This One. The pitch is the most expensive door.
Every professional firm, from ad agencies to law firms, finds most of its new work the same way: someone who already worked with them tells someone else. The decision that matters is where you spend the hours that produce that.
When I worked on the client side of a large packaged-food company, agency people regularly asked me for a way in. A meeting, an introduction, a name. I had a senior title and a narrow slice of budget authority, and I could not have handed anyone an account if I had wanted to. What stayed with me was how much effort went into getting through that door, and how little seemed to go into the accounts those same agencies already held.
That turned into a question I could test. Do agencies struggle to win work because they chase it, while the big strategy consultancies have it come to them? I wrote the hypothesis down before reading anything, and it did not survive. The channel is the same for every kind of professional firm. What differs is where each one spends its effort.
Ask agency owners where new business comes from and the answer barely moves. In SparkToro's 2024 survey of digital agencies, 66 percent said their top source was referrals from existing and past clients. Law firms report the same thing. Clio's 2025 report on solo and small firms found referrals were their strongest source of new clients, and BTI Consulting, which interviews corporate legal buyers every year, reports that up to 64 percent of them hire the first firm recommended to them.
There is no hidden channel the consultancies use and agencies miss. There is the person who already worked with you, and what they say about it afterward.
The door most agencies know best is the pitch. In 2023 the ANA and the 4A's, the trade bodies for advertisers and for agencies, published the first study to price a review from both sides of the table, from 329 interviews with marketers, procurement staff and agency people.
What an agency spends, on average, to pitch for an account it has never held: staff time, consultants, travel, research, free ideas, and the disruption to work it is already being paid for. Add the client's own costs and three finalists, and one review runs to about $1 million.
The rest of the report explains why that money is hard to earn back. Two in three clients said they kept their incumbent agency after their most recent review. Cost and price was the top factor in choosing a winner, named by 62 percent of clients, well ahead of creative execution at 45 percent. And the average agency in the study took part in 23 reviews over two years, about one a month.
Put together, the pitch looks like this: a large cost paid up front, for a minority chance at an account that is decided mostly on price. Some pitches are worth it. As a system for growth, it is the most expensive door in the building.
| № | The door | What the evidence says | When you pay |
|---|---|---|---|
| 01 | Open pitch against an incumbent | The incumbent is kept two times in three; price is the top reason a winner is chosen | Up front, about $204,461 a try, win or lose |
| 02 | Cold outreach | No independent measure found. The surveys that recommend it are run by firms that sell it | Up front, in hours |
| 03 | Referral from a current or past client | The top source of new business for agencies and law firms alike | During delivery, before the referral exists |
| 04 | More work inside a current client | Clients served across several practices are more profitable over time | During delivery, in attention to a client already paying you |
Doors 3 and 4 are paid for inside work you are already being paid to do. Doors 1 and 2 are paid for before anyone has agreed to anything.
Domino's × WorkInProgress
2021–2027Domino's brought in WorkInProgress, an independent agency in Boulder, Colorado, as its lead creative shop in 2021. In April 2025 it extended the agency-of-record contract through 2027 and added social media to the remit, so the agency now leads strategy and creative across every part of the brand. Announcing the extension, chief marketing officer Kate Trumbull said many of the agency's team had worked on the brand for more than ten years.
The bigger remit came from inside the account, from the people who had been on it longest, with no review involved.
“We have one of the rarest agency partnerships in the history of our industry.”
Kate Trumbull, EVP and chief marketing officer, Domino's, April 2025
The strongest evidence on how firms grow inside accounts comes from law. Heidi Gardner at Harvard Law School's Center on the Legal Profession studied a decade of law-firm records. Partners who routinely brought other partners into their client work grew their own books of business significantly in the years that followed, even after controlling for how large their book was to begin with. The fear that big clients would use their weight to demand discounts turned out to be real, she found, but clients served by several practices were still more profitable on average over the long run.
For a small firm the translation is direct. Bringing a trusted specialist into a client's problem feels like giving margin away. The data says it is how the book grows.
If referral is the channel, the question becomes what produces a referral. Good work is required, and on its own it is not what clients talk about. A 2019 study of business clients of financial consultancies, published in Industrial Marketing Management, found that the experience of being served had a stronger effect on satisfaction, loyalty and word of mouth than the measured quality of the service. BTI, which ranks law firms using only their clients' ratings, ties four behaviors to higher profits, rate premiums and retention: commitment to help, focus on the client, understanding the client's business, and value for the fee.
Firms and clients also disagree about why relationships end. Setup, a firm that runs agency searches, surveys both sides every year. In its data, clients ranked problems with delivery as their second most common reason for leaving an agency. Agencies ranked it ninth. The ANA's 2023 report adds a second signal: half of clients named rising agency staff turnover as a factor in how often they call a review.
And clients who aren't pushed into reviews tend to stay. The ANA and the 4A's reported in April 2025 that agency-of-record relationships now average about seven years, and 8.1 years where the client has no mandatory review period, against as little as 3.8 years where reviews are frequent.
Nearly all of it is self-reported. Surveys reach firms that are still in business and willing to answer. The agencies that pitched their way into trouble are not in any of these samples.
Several sources sell to the firms they study. BTI sells client-feedback programs to law firms. Setup runs agency searches. Their direction agrees with the independent work; their exact figures deserve less weight.
Gardner's data comes from law firms. That it carries over to agencies and strategy firms is my inference, supported by the referral data but not measured directly.
This needs a book. A firm with no clients cannot grow inside one. For a new firm the pitch or cold outreach may be the only door available, and nothing here argues otherwise.
- You have clients whose work you would gladly do again — the pattern runs on an existing book. With no book yet, it does not apply.
- Your clients have more problems than you are solving — room to grow inside the account has to exist, and it usually shows up in what they complain about outside your scope.
- You can see the buyer's business, not just the brief — if all you know is the assignment, you cannot spot the next one.
- The pitch on your desk has an incumbent defending it — the case for walking away is strongest here. An open search with no incumbent is a different decision.
This week, write a one-page expectations agreement for your largest current client and ask them to confirm it.
Write down the problem in their words, what is in and out of scope, how they will know the work worked, who decides what on each side, and how fast you will respond. Send it and book twenty minutes to go through it together. Research on professional services keeps finding the same gap: clients judge the work against expectations that are often vague or never said out loud, so the firm is graded against a standard it never saw. Writing it down is the cheapest fix there is.
- What it costs
- Two to three hours to write and discuss, and the discomfort of hearing what the client would change. If it takes the place of time on an open pitch, you give up that shot.
- How you'll know
- Within two weeks, a confirmed page with at least one correction from the client; a page with no corrections usually means nobody read it. Within six months, more work in the account or an introduction you did not ask for. If neither arrives, the account is not producing your next client, and you know it early.
The pitch will always be there, and sometimes it is the right call. The work that finds you next is being decided now, in accounts you already run, by people deciding whether you were worth recommending.
Related from Sound Decisions: Nobody Pays You Extra for Being Honest · The Marketing Job Is Derived Power · The Ground Nobody Was Defending
One conversation. Where your next client already is.
Not a new-business program. A look at the accounts you already run, and which of them could produce the next piece of work.
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