An SEO content writing agency sits in an awkward place in the market. At the top end it is a research and editorial operation that decides which questions are worth answering, interviews people who know the answer, and writes pages a buyer would actually finish reading. At the bottom end it is a queue of low-cost drafts assembled from whatever already ranks. Both sell by the page or by the month, and both use the same vocabulary in the proposal. This page sets out what the work involves when it is done properly, what actually changes the price, and the specific checks that tell the two apart before money changes hands.
What you are buying, stripped of the vocabulary
Four distinct jobs hide inside a content retainer, and the price depends almost entirely on which of them are included. The first is selection: deciding which queries deserve a page, which is research rather than writing and is often the most valuable part. The second is the brief: the angle, the structure, the questions the page must answer and the sources it must use. The third is drafting and editing. The fourth is production: publishing, internal linking, images, metadata and keeping the page current afterwards. Cheap quotes almost always cover only drafting and hand the rest back to the client, which is fine if the client has an editor and a publishing process, and expensive if they do not. Ask which of the four is in scope, in writing, before comparing any two numbers.
The line Google draws, and why it matters to the invoice
Google's guidance on creating helpful, reliable, people-first content asks whether a page provides original information, whether it demonstrates first-hand expertise, and whether a reader leaves feeling they learned enough to accomplish their goal. Its spam policies name the opposite pattern directly: scaled content abuse, meaning many pages generated mainly to manipulate rankings rather than help users, including pages produced with generative tools without adding value, and content stitched together from other pages. Google is explicit that this applies no matter how the content is created, so the method is not the test, the value is. A vendor promising a large monthly page count at a low unit price is, arithmetically, promising the pattern Google names. The buyer carries that risk, not the writer.
What genuinely moves the price per page
Four things. Subject difficulty comes first: a page about industrial fastener tolerances or clinical billing costs more than a general business post because it needs a writer who understands it or access to someone who does. Original input is second: interviews, proprietary data, photographs and product access all cost time and all produce the things Google's helpful-content guidance describes as first-hand expertise. Review burden is third, and it is the hidden one in regulated fields where legal or compliance sign-off is mandatory. Length is a distant fourth, though it is the variable most proposals lead with. When two quotes differ by a wide margin, the gap is nearly always in the first three rather than in word count.
The checks that separate an editorial team from a mill
Ask to see three published pages the agency wrote and can name, then read them as a buyer rather than as a marketer: is there anything in them that only someone with access to the client could have known. Ask who writes, by name, and whether you can speak to that person. Ask what the revision policy is and how many rounds are included, because unlimited revisions usually signal drafts that need them. Ask how generative tools are used and how output is checked, and treat a flat denial as no more reassuring than a flat endorsement. Finally, ask for the brief that produced one of those sample pages: agencies with a real editorial process have briefs, and mills have templates. Content is normally bought per page or as a fixed monthly allocation, so a scope written that way is also easier to leave.
Questions people ask about seo content writing agency
How many pages a month should I expect?
Fewer than most proposals promise. A properly researched page with original input takes real hours, so a small team producing a handful a month is credible while a large monthly count at a low unit price is a volume operation. Judge the number against the price and the depth of the samples, never on its own.
Does AI-written content get penalised by Google?
Google's spam policies target scaled content abuse, meaning many pages generated primarily to manipulate rankings rather than to help users, and say explicitly that this applies no matter how the content is produced. The tool is not the issue. Pages that add nothing are, whoever or whatever wrote them.
Should the agency also handle publishing and internal links?
It is usually cheaper if they do, because the alternative is a drafts folder nobody has time to publish. Just make sure it is priced and named in the scope rather than assumed, and that you keep administrative control of the site itself.
Who owns the content once it is written?
You should, on delivery and outright, with the transfer written into the agreement rather than implied by the invoice. Ask before signing, and ask specifically what happens to unpublished drafts if the engagement ends mid-month.