Choosing a Performance Marketing Agency: Questions to Ask and Claims to Verify

Hiring a performance marketing agency means giving another team access to your budget, your customer data, and your growth targets. A good fit can accelerate results. A poor fit can waste a quarter's spend and leave you with accounts you do not control and data you cannot read.

This guide helps you evaluate agencies on evidence rather than presentation. It covers whether to hire at all, what to ask, which claims to verify, which contract terms matter, and how to run a pilot. It is written from the buyer's side. We are an agency ourselves, so we have tried to describe the standards we think any buyer should apply, including to us.

First Decide Whether You Need an Agency

An agency is useful when you lack capacity, specialist skills, or the volume to justify a full in-house team. It is less useful when you have no clear offer, no tracking, or no sales process, because those problems sit outside media buying.

Consider an agency if:

• You need several channel specialisms but cannot hire them individually.
• You want to test quickly and have no internal testing process.
• Your spend is large enough that management quality changes outcomes meaningfully.

Consider building in-house or fixing fundamentals first if:

• Your offer converts poorly on every channel.
• Your CRM does not record lead outcomes.
• You cannot state your target cost per qualified lead.

If you are in the second group, the lead generation framework is a better starting point than a procurement process.

Define the Brief Before You Speak to Anyone

Write a one-page brief covering:

• Business model and average customer value
• Target customer and geographic scope
• Current channels, spend, and results, including what you do not know
• Goals expressed as cost per qualified lead, customers, or revenue
• Budget range and timeline
• Constraints such as compliance, brand rules, or platform restrictions

Giving every candidate the same brief makes proposals comparable.

Questions to Ask, and What Good Answers Look Like

How will you define and measure success?

Good answers refer to qualified leads, customers, and cost per customer, and acknowledge the limits of platform-reported numbers. Weak answers focus on clicks, impressions, or "traffic."

Who will work on my account?

Ask for names, roles, and the share of time each person will give. Meet the people who will manage the account, not only the sales team.

What is your process for the first 90 days?

Expect a sequence: audit, tracking setup, structured launch, testing, reporting. Be cautious of promises of immediate results before measurement is in place.

How do you set up tracking, and who owns the data?

You should own your ad accounts, analytics properties, and CRM data. The agency should work as an authorized user. See the conversion tracking audit checklist for the standard you can hold them to.

How do you report, and how often?

Ask to see a sample report. It should show spend, qualified leads, cost per qualified lead, and changes made, in plain language. Compare it with the dashboard structure in our KPI guide.

How do you test?

Look for hypotheses, defined metrics, and documented results, as described in our testing roadmap guide.

What would make you say we are not a good fit?

An agency that can articulate when it would decline work is usually more credible than one that accepts every brief.

Evidence to Request

Claims are cheap. Ask for material you can check.

• Case studies with context. Industry, starting position, actions, timeframe, and measured outcome. Be wary of results shown as percentages with no baseline.
• Client references. Speak with at least two current or recent clients, ideally in a similar sector, and ask what went wrong as well as what went well.
• Platform partner status. Programs such as Google Partners exist and can be checked through the platform's directory, though badges alone do not guarantee quality.
• Sample audits or proposals. A short audit of your own account shows how the agency thinks.
• Team experience. Ask about the individuals' experience with your model and budget size.

Regulators expect advertising claims to be supported by evidence. That applies to the claims agencies make about their own results, so treat unsupported guarantees as a warning.

Pricing Models, and What Each Rewards

• Fixed monthly retainer. Predictable cost for a defined scope. Rewards steady service, but not directly tied to results.
• Percentage of ad spend. Scales with the size of the account. Can reward raising spend rather than improving efficiency.
• Performance-based fees. Paid per qualified lead, sale, or agreed outcome. Rewards results, but depends on a precise definition of the paid action.
• Hybrid. A lower base fee plus a performance component. Balances stability with shared incentives.

No model is inherently better. Choose the one whose incentives match your goals, and write the details into the agreement. For results-based arrangements, the definition of the paid action is critical, as explained in our guide to CPA marketing.

Contract Terms That Protect You

• Account ownership. Ad accounts, pixels, and analytics belong to you, with agency users added.
• Data access. Full access to raw data and reports at any time.
• Spend authority. Who can change budgets, and any approval thresholds.
• Minimum term and exit. Notice period, handover obligations, and how long the agency must support transition.
• Confidentiality and data protection. Clear obligations on how personal data is handled, especially where data protection law applies.
• Subcontracting. Whether work is outsourced, and to whom.

Red Flags

• Guaranteed leads or returns with no conditions
• Refusal to give you account ownership or access
• Reporting that shows only activity metrics
• Vague answers about who does the work
• Pressure to sign quickly or pay long-term in advance
• Blaming past agencies for everything without evidence
• No questions about your business, margins, or sales process

How to Compare Proposals Fairly

Score each proposal against the same criteria so the decision rests on evidence and not on the strongest pitch. A simple scorecard might cover fit with your sector and model, quality of the measurement plan, clarity of the first 90 days, evidence from references, transparency on fees and ownership, and the strength of the proposed team. Weight the criteria according to your priorities, and have at least two people score independently before comparing notes. Differences between scorers often expose assumptions worth discussing.

Onboarding: What the First Month Should Include

A well-run onboarding gives you a clear picture of progress. Expect access setup with you as owner, a tracking audit, a review of existing campaigns and data, agreement on definitions of a qualified lead, a launch plan with budgets and timelines, and a reporting template you have approved. At the end of the month, you should be able to explain what was found, what was changed, and what happens next. If you cannot, ask for a written summary. The agency's response tells you a great deal about how it will communicate later.

Working Well Together After You Sign

The relationship succeeds or fails in the routines that follow. Agree on a single point of contact on each side, a weekly short call, a monthly strategic review, and a shared document for decisions and open questions. Give the agency timely access to sales feedback and outcome data, because they cannot optimize toward qualified leads without it. Share changes in your business, such as pricing, capacity, or seasonality, as soon as you know about them. Agencies deliver better results when they treat the client as a partner with information, and clients get better service when they treat the agency as part of the team.

Checking Cultural and Communication Fit

Skills matter, but so does working style. Notice whether the agency listens, explains in plain language, and admits uncertainty. A team that communicates clearly in the sales process usually communicates clearly during delivery, and a team that cannot answer simple questions now will not improve after signing.

Frequently Asked Questions

How much should I budget for an agency?

Consider both agency fees and ad spend. Fees should be a sensible share of the total, and the ad budget should be large enough to generate learnable data.

Should I choose a specialist or a full-service agency?

Specialists bring depth in a channel or sector. Full-service agencies offer coordination. Choose based on where your constraint lies.

How long before I see results?

Early indicators can appear within weeks, but meaningful evidence of qualified leads and customers usually takes a full sales cycle.

Can I move work in-house later?

Yes, if you own your accounts and data and the contract provides for handover.

Key Takeaways

Define your brief, ask outcome-focused questions, verify claims with references and samples, insist on ownership of accounts and data, match the pricing model to your goals, and run a structured pilot. Choose the agency that can show its reasoning, not just its results.