The way most owners choose a marketing agency is backwards: they meet a few agencies, pick the one they like, and only then work out what they wanted. This guide reverses the order. You decide what success looks like first, then judge every candidate against it. The process takes three to five weeks and saves a great deal more than that in wasted months.
Step 1: Know your numbers before the first call
Answer first: you can't judge an agency's proposal without knowing what a customer is worth to you. Agencies will happily fill that gap with their own assumptions.
Gather four figures before speaking to anyone:
- Average gross profit per new customer, including likely repeat business over two years
- Close rate: of every ten qualified enquiries, how many become paying customers
- Capacity: how many new customers you can serve each month at current staffing
- Current spend: everything you pay for marketing now, including fees, ads and software
From these you get a target acquisition cost and a sensible budget ceiling. If you've never done this, our budget guide walks through it with a worked example.
Step 2: Write a short brief
Answer first: a brief of two or three pages makes every agency respond to the same problem, which is the only way to compare them fairly.
A good brief covers:
- Your business in one paragraph: what you sell, to whom, where
- The goal: for example, 30 qualified enquiries a month at or below $150 each within six months
- Budget range: fees and ad spend separately
- Channels in scope: search, social, website, email, or "open to recommendation"
- What you already have: website, ad accounts, review profiles, CRM
- What you will own: state up front that accounts, domain and content must be in your name
- How you will measure success: tracked calls, texts, emails and sales, not traffic alone
- Timeline and decision date
Send the same brief to every candidate. Agencies that ignore it and send a generic deck have told you how they'll treat your instructions later.
Step 3: Build a longlist, then cut to three
Answer first: start with six to eight possibilities and cut hard to three on evidence you can check before any meeting.
Good sources for a longlist include referrals from owners in non-competing businesses, agencies whose work you've noticed in your own market, and industry associations. For each candidate, check the following before inviting them to pitch:
- Do they show named clients with live websites you can visit?
- Have they worked with businesses of your size and sales model?
- Can you find the people who would work on your account, not just the founders?
- Do their own website and reviews look cared for?
Cut anyone who can't pass all four. Three finalists give you a real comparison without eating weeks of meetings.
Step 4: Interview with the same questions
Answer first: structured interviews, with identical questions and a scoring sheet, stop the most charming presenter from winning by default.
Questions worth asking every finalist:
- Who exactly will work on our account, and how many other accounts does each person handle?
- Walk us through what you'd do in the first 90 days, month by month.
- How will you track calls, texts and emails back to their source?
- What will the monthly report contain? Can we see a real, anonymised example?
- Who owns the ad accounts, analytics, website and content, during and after the contract?
- How is your fee structured? Is ad spend included, billed through you, or paid by us directly?
- What is the notice period, and what do we get back when we leave?
- Tell us about a client you lost. What happened?
- What would make you tell us our budget is too small for the goal?
- What do you need from us to succeed?
Question 8 is the most revealing. Honest agencies have a clear answer. Question 9 tests whether they'll tell you uncomfortable truths.
Step 5: Score candidates on one sheet
Answer first: weight the criteria to your priorities before the interviews, then score each finalist independently.
| Criterion | Suggested weight | What a strong answer looks like |
|---|---|---|
| Relevant experience | 20% | Named, checkable work for similar businesses |
| Clarity of 90-day plan | 20% | Specific actions by month, tied to your brief |
| People and capacity | 15% | Named team members with reasonable workloads |
| Measurement and reporting | 20% | Tracking of real enquiries and sales; sample report shown |
| Commercial terms and ownership | 15% | Clear fees, your ownership of assets, fair notice |
| Communication fit | 10% | Responsive, plain language, listens more than talks |
If two people from your business attend, score separately and compare. Disagreements usually point to something worth a follow-up question.
Step 6: Settle the terms before signing
Answer first: the issues that cause most agency disputes, such as ownership, access and exit, are easy to settle before signing and painful to settle after.
Confirm in writing:
- Every account is registered to your business, with the agency added as a user
- The website files, content and creative belong to you once paid for
- How ad spend is billed and whether any fee applies to it
- What the monthly report includes and when it arrives
- The notice period and the handover process on exit
- Who your day-to-day contact is, and what happens if that person leaves
A lawyer should review the legal wording of any significant contract. A business advisor can help with the substance: scope, measurement and ownership. Our proposal review service covers that substance.
Step 7: Plan the first 90 days
Answer first: agree on what the first quarter should produce, and put a review date in both calendars on day one.
Month one is usually setup: access, tracking, audits and campaign builds. Month two brings early data. Month three should show a trend in cost per enquiry. Agree in advance which numbers you'll review at day 90, and what level would prompt a frank conversation.
Common mistakes when choosing an agency
- Choosing on price alone. The cheapest retainer often excludes the work that produces results.
- Being dazzled by tools. Proprietary dashboards matter less than whether the data in them is accurate.
- Hiring for a channel you don't need. A service business that wins work through local search may not need a large social media package.
- Skipping references. Ask for two current clients you can call, and ask them what the agency is bad at.
- Signing a long term before trust exists. A shorter initial term or a defined first project lowers the risk for both sides.
When to get help
You can run this whole process yourself with the steps above. Owners usually bring in an advisor when time is short, the spend is significant, or a past hire went badly. Our agency selection service runs the process with you, and our pricing page shows what that typically costs. If you already have an agency and want to know whether to keep it, start with the agency audit checklist instead.
Frequently asked questions
How long should it take to choose a marketing agency?
Three to five weeks is realistic for a careful process: a week for the brief, a week to shortlist, one to two weeks of interviews and a few days to decide. Rushing usually means skipping the brief, which is the step that matters most.
Should I choose a specialist agency or a generalist?
If your business depends on one channel, such as local search for a service company, a specialist in that channel is often the safer choice. If you need several channels coordinated, a generalist with proven depth in your main channel can work well.
Is a small agency or a freelancer riskier than a large agency?
Different risks, not more risk. A freelancer can be excellent but has no cover for illness or holidays; a large agency has cover but may give you junior staff. Ask each how they handle both problems.
What is the biggest red flag in an agency pitch?
A promise of specific rankings or lead numbers before they have seen your accounts or your market. Nobody can know that in advance, and a vendor willing to say it is telling you something about how they will report later.