The short answer
Choose an agency on three things: whether they diagnose before they pitch, whether the people in the pitch are the people doing the work, and whether their reporting ties to revenue rather than activity. Ask for a named team, a written 90-day plan with owners and dates, and at least one reference where results were slower than expected — then structure the contract as a short paid diagnosis before any long retainer.
Judge the diagnosis, not the deck
The single strongest predictor of a good agency relationship is what happens in the first conversation. A strong partner spends most of it asking about your funnel economics, sales follow-up, and where deals currently die. A weak one spends it showing logos and channel packages.
If an agency can propose a scope before understanding your conversion rates, they are selling a template. Templates work occasionally and fail quietly.
Seven questions that separate partners from vendors
Ask these in the second call, and write the answers down:
- Who exactly will work on this account, and what else are they working on?
- What did you stop doing for a client in the last year because it was not working?
- What do you need from us for this to succeed — and what happens if we do not deliver it?
- How will we know in 60 days whether this is working, before revenue lands?
- Show me a client where results took longer than you expected. What did you change?
- How do you handle leads after they are generated — who owns follow-up and speed-to-lead?
- What does month 13 look like if everything goes well?
Red flags that predict a month-four breakup
None of these are automatically disqualifying, but two or more together usually means you are buying activity rather than outcomes.
- Guaranteed lead numbers with no discussion of lead quality or close rates.
- Twelve-month lock-in demanded before any diagnostic work.
- Reporting built on impressions, clicks, and 'engagement' with no pipeline column.
- The senior strategist appears in the pitch and never again.
- No opinion on your positioning — only on your channels.
Structure the contract so both sides can be honest
The healthiest structure we see is a short paid diagnosis (two to four weeks) that produces a written plan you own regardless of what happens next. If the plan is sharp, the retainer is an easy yes. If it is generic, you have lost weeks instead of a year.
After that, prefer a 90-day initial term with a defined review, then quarterly renewal. Long lock-ins protect the agency's revenue, not your outcome.
What a good first 90 days looks like
Weeks 1–3: diagnosis, access, baseline metrics, and an agreed definition of a qualified lead. Weeks 4–8: the first system goes live — usually the highest-leverage channel plus fixed lead routing and follow-up. Weeks 9–12: measurable leading indicators moving, and a clear decision about where to concentrate next.
If by day 90 you cannot see a single leading indicator improving and nobody can tell you why, that is your answer.
Frequently asked
Should I hire a specialist agency or a full-service partner?
Hire a specialist when you know exactly which channel is under-performing and why. Hire a full-service partner when pipeline is unpredictable and you do not yet know where the constraint sits — diagnosis matters more than execution depth at that stage.
How much should a long-term growth partnership cost?
Meaningful retainers generally start around $3,000 to $8,000 per month for focused scopes and rise with execution breadth. Anything far below that usually buys junior execution against a template.
How do I compare two agencies fairly?
Give both the same brief and the same data, and compare their questions rather than their proposals. The one asking sharper questions will make sharper decisions with your budget.
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