SEO agency: what it costs, what's included, and how to evaluate one

Hiring an SEO agency is one of the most opaque purchases in marketing: prices range from a few hundred to tens of thousands, proposals look alike, and results take months to show. This guide is for reading a proposal with judgment.

What an SEO service actually includes

A complete service covers five fronts. If one is missing from the proposal, ask why.

1. Initial technical audit. The state of the site: indexing, speed, mobile, structure, structured data, crawl errors.
2. Demand research. What your customer searches for and in which words. Not a list of a thousand terms: identifying which ones carry buying intent and are realistically reachable for you.
3. Prioritized plan. What gets done first and why. Without prioritization, a plan is a wish list.
4. Execution. Technical changes, new content, optimization of what exists. This is the most expensive difference between agencies: some execute, others only recommend and hope your team does it.
5. Measurement and reporting. And the key word is business: qualified traffic and conversions, not rankings alone.

The pricing models

The retainer range is wide because it spans very different realities: near the floor it's usually a local business with a small site; at the top, an ecommerce with thousands of URLs across several markets. Well below the floor, what's being sold is almost always automated reporting with very little human work behind it.

On performance-based pricing: it sounds fair and rarely is. It pushes the agency toward whatever is easy to move rather than whatever makes money, and "performance" gets defined in conveniently vague terms. If you consider it, insist the metric be conversions or revenue — never rankings.

How to evaluate a proposal

Ask for this before signing:

• Two cases from your own sector, with numbers and access to those clients so you can ask them directly.
• The name of whoever will handle your account day to day. At many agencies, the person selling isn't the person doing.
• A real monthly report sample (data redacted). That's where you see whether they measure business or vanity.
• The exit terms, and who keeps the access credentials and the content produced.

Red flags, in order of severity:

1. Guaranteed first position. Nobody controls the algorithm. This signal alone is enough to walk away.
2. Links sold by volume. Bulk link schemes are among the few practices search engines penalize explicitly.
3. Long contracts with no exit. Twelve mandatory months protect the agency, not you. Six with an out at three is reasonable.
4. No explanation of what was done this month. If the report is a chart with no work detail, there's no way to know work happened.
5. Rankings-only reporting. Moving from position 40 to 25 is worth nothing if nobody clicks there.

When an agency is the right answer

• Nobody on your team will execute. The most honest case of all. A diagnosis with no hands to implement it changes nothing.
• The project is large or complex: thousands of URLs, several languages, a catalog with filters.
• You're facing a migration or a serious drop. Here, prior experience beats any dashboard.
• You need several disciplines at once: technical, content, digital PR.

When another route serves you better

If you have someone to execute — your developer, your content person, yourself — and your case is one site in one market, what you're missing isn't hands: it's knowing what to do first. A monthly retainer is expensive for that.

The alternative: a tool that monitors continuously, tells you what's broken and in what order to fix it, alerts you when something breaks, and surfaces the queries where you already rank between positions 4 and 20 — the cheapest wins available. For a fraction of a retainer. We also compare the independent consultant route, which is usually the middle ground.

And one layer almost no agency proposal includes yet: whether AI engines cite you. More and more searches end in a generated answer where there's no position to win, only sources that get cited. We cover it in SEO vs GEO vs AEO.

Running an agency yourself?

If you're on the other side of the table, the problem is different: proving the value of your work month after month without burning hours assembling reports by hand.

AEON42 has a plan built for that: multiple sites under one account, a white-label client portal so each client sees their progress without asking you, PDF reports carrying your identity, and the data almost nobody offers yet — whether AI engines cite your clients. See the plans.

Before signing anything, measure

Without a baseline you can't judge a proposal or verify progress in six months. The free audit gives you, in under a minute, your site's technical state and its readiness for search engines and AI: a verifiable starting point to compare against whatever you're offered.