How to choose an SEO agency: what SEO services cover and what they cannot promise

An SEO agency is the team that runs three jobs together so a site can be found on Google and in AI search: making the site technically crawlable and fast, answering the right question with the right page, and making that page look trustworthy. A service that does only one of the three is selling part of SEO.

The fastest way to tell a good SEO agency from a poor one is to look at what it promises. This piece covers what SEO services actually include, how long they take and what to ask in the first meeting.

What do SEO services cover?

A complete SEO engagement has four parts:

• Technical SEO. Crawling and indexing issues, site speed (Core Web Vitals), redirects, duplicate pages, structured data and hreflang on multilingual sites. The full list is in our technical SEO guide.
• Content architecture. A plan of which page answers which query. Not a keyword list but a page map.
• Content production and refresh. New pages and a regular update cycle for existing ones.
• Trust. External links, brand mentions, Google Business Profile and reviews. In local search this part decides a lot; see the local SEO piece.

A fifth part has been added in recent years: being cited as a source in ChatGPT, Gemini and Google’s AI overviews. This is called GEO, and it builds on well-executed SEO rather than replacing it.

When do SEO results come?

A realistic timeline:

• Technical fixes show up in Search Console within 2–6 weeks: indexed page count, crawl errors, the speed report.
• Content-driven ranking movement takes 3–6 months, longer on competitive queries.
• On a new site impressions come first and clicks later. Pages usually appear on results pages two to five in the first months; clicks start as queries approach page one.

An agency promising a shorter timeline is either selling ads as SEO or will be producing excuses a few months in.

Eight questions to ask an SEO agency

1. What exactly will you do in the first three months? The answer should be a work list: audit, fixes, content plan. “Optimisation” on its own is not an answer.
2. Who will make the technical fixes? If the agency only reports and leaves implementation to your developer, fixes wait in a queue for months. Who changes the code should be clear from day one.
3. What will you report? Rankings alone mislead. The report should include impressions, clicks, indexed pages and enquiries from organic search.
4. Which queries will we focus on, and why? A list full of high-volume queries with no buying intent brings traffic, not customers.
5. Who will write the content? Copy from a writer who does not know your field convinces neither readers nor Google. Who provides the expertise, and who approves?
6. How do you earn external links? “A package of 100 links” is a risk; bought links expose your site to penalties.
7. Who will own Search Console and Analytics? The accounts should be in your name, with the agency given access.
8. What do I keep when the contract ends? The content, the reports and a list of the technical changes made.

Which promises should you walk away from?

• “Guaranteed first position.” Nobody controls the algorithm that decides rankings. An honest agency sets targets for technical health, indexed pages, impressions and clicks instead.
• “Page one in a month.” Not realistic outside an uncontested brand query.
• “A secret method.” In SEO, a secret method is usually one Google prohibits.
• Keyword ranking reports only. If your rankings rise while enquiries do not, the wrong queries are being tracked.

SEO agency or advertising?

They do not answer the same question. Ads bring demand today and stop when the budget stops. SEO compounds over months and does not vanish the day you stop. For most businesses the right answer is a ratio between the two; we worked it out in SEO vs Google Ads.

How are SEO services priced?

SEO is usually sold on a fixed monthly fee. What matters more than the amount is what the fee covers: how many pages of content a month, whether technical fixes are included, whether there is link-earning work. When comparing two proposals, put those three items side by side. The general logic of fee models is in ad agency pricing; the same questions apply to SEO.

Frequently asked questions

Is an SEO agency the same as a digital marketing agency? No. A digital marketing agency also covers ads, social media and email; an SEO agency focuses on organic search. Some agencies do both.

Can I do SEO myself? For basic technical checks and your Google Business Profile, yes. Content architecture and technical fixes take time and expertise; the real cost is usually your own time.

Will rankings drop if I stop SEO work? Not immediately, but they slip over time as competitors keep working. That is why keeping content current matters.

When should a new site start SEO? While it is being built. URL structure, speed and the page plan are expensive decisions to fix later.

At Boygantech, SEO work starts with a technical audit, and fixes are made in the same team, directly in the code. The scope is on our SEO and growth service page.