What a UK SEO agency should cost and deliver in 2026

Search "seo agency" in the UK and the first page is agencies ranking themselves first in their own top-ten lists.

Exposure Ninja puts Exposure Ninja at number one. Propeller puts Propeller at number one. Omnius puts Omnius at number one. None of the three tells you what SEO costs, what a retainer should contain, or how to tell after three months whether the money is doing anything.

We run an SEO agency in Northampton, so we have the same interest they do. The difference is that this page is about the buying decision, not about us. It covers what a retainer should contain in 2026, what UK agencies charge at each business size, how to read a proposal and a monthly report, how long it takes, and the places where SEO now stops working as well as it used to.

What an SEO retainer should contain in 2026

A retainer should pay for changes to your website and your Google Business Profile, plus a measurement of enquiries, and very little else. The work splits into five parts, and a proposal that cannot describe all five in plain words is missing something.

1. Technical work on the site: crawlability, indexing, page speed, redirects, broken pages. On a WordPress site of normal size this is a short job, something like one afternoon of technical SEO at the start and a quarterly check after that. It is not a monthly line item.
2. Pages for the things you sell. For most local businesses a 15-page site with one page per service beats a 200-post blog, because people searching for a plumber in Kettering want a page about plumbing in Kettering. Service-area pages work when each one says something true about that area, and read as spam when the agency changes the town name and nothing else.
3. The Google Business Profile. For a business that serves a place, the profile is the local SEO product, and it needs a monthly routine of photos, posts, review replies and category checks. A one-off setup is not enough. For clinics and dental practices the profile is often the single biggest source of new patients, so that routine is not optional.
4. Content that shows experience. Google's quality rater language is E-E-A-T, and the first E is experience: photos of your own work, prices, the questions customers actually ask. For a professional services firm that means the named solicitor or accountant with real credentials behind the byline, not an anonymous blog. If an agency is using AI to write your content, you will usually be able to tell, because every page says the same things in the same order. Ask who writes it and what they are given to write from.
5. Links and mentions, earned slowly, with a backlink audit at the start if a previous agency bought any.

The things to be suspicious of are the deliverables that are theatre: keyword ranking PDFs for 200 terms, "optimised" meta descriptions rewritten every month, directory submissions, and a quarterly "content strategy" document that nobody implements. They fill a report without moving an enquiry.

Google's own advice on hiring an SEO fits on one page. Its guidance for site owners lists what a legitimate SEO does: review your site content and structure, give technical advice, develop content, research keywords, and now "optimize for generative AI". That last item was added recently and it belongs on a 2026 retainer, which we come back to below.

What UK SEO agencies charge

A UK SEO retainer from an agency costs between £1,000 and £3,500 a month for most small and medium businesses, with freelancers below that and mid-market agencies above it. The ranges below come from four published sources, and they do not agree with each other, which is useful in itself.

Two things stand out. The published-price median of £799 sits below the floor of the agency retainer band. Whito explains this itself: firms that publish prices "skew towards the budget end of the market because mid-market and premium providers typically do not publish pricing". So the number you see on a pricing page is the cheap end, and the number you get in a proposal is the real market.

The second is that business size and provider size move together. Whito's general bands put a business turning over under £100,000 at £500 to £1,000 a month across all marketing, a £500,000 to £2 million business at £1,500 to £3,000, and a £2 million to £5 million business at £2,500 to £5,000. Those are not SEO-specific, but they match the SEO bands well enough to use as a sanity check on a quote.

xychart-beta
    title "Where UK SEO prices start, by source (GBP per month, 2026)"
    x-axis ["Whito entry median", "Whito published median", "Whito retainer floor", "Visionary small agency", "Koozai from", "Visionary mid-market", "Koozai typical"]
    y-axis "GBP per month" 0 --> 4500
    bar [447, 799, 1000, 1000, 1650, 2500, 4125]

ExpertMarket's widely cited cost guide gives a small business band of "$1,000 to $6,000 per month", but it is priced in US dollars and dated January 2023, so it is not a UK benchmark and we have left it out of the table.

Visionary's review is also the best source on what each band buys. Its tiers put £750 to £1,500 a month at three to six senior hours a week with one or two articles and one to three links, and £3,000 to £5,000 at 12 to 20 senior hours a week with four to eight articles, six to twelve links and full technical implementation. The same page lists the add-ons that appear after the quote at other agencies: onboarding fees of £1,000 to £5,000, articles at £400 to £800 each, links at £200 to £500 each. Ask whether content and links are inside the retainer or on top of it before you compare two proposals.

One more number for context. Google Keyword Planner puts the top-of-page high bid for "seo agency london" at about £59 a click (UK, October 2026), and the same economics drive what a Google Ads agency charges. Agencies pay that because a signed client is worth a retainer of £2,000 or more a month for a year. When you see a cheap package, remember that somebody still has to cover the cost of finding you.

How to judge a proposal

A good SEO proposal names the pages it will change, the people who will change them and the number it will be judged on. Everything else is packaging, and the wider test of how to choose a digital marketing agency applies here too. Here is what we would check, in order, on any proposal that lands on your desk.

1. Outputs with quantities. "Content" is not an output. "Two service pages a month, written from a call with your team, and one technical fix list in month one" is. If the proposal lists services without counts, ask for counts.
2. The starting audit. A proper SEO audit should, in Google's words, be "about giving you realistic estimates of improvement, and an estimate of the work involved". A free five-page audit is a sales document. A 90-page PDF with 400 "errors" is a tool export. Neither tells you what to do first.
3. The backlink position. Ask whether they will audit the links you already have. If a previous agency bought links, you want to know before the new one builds on top of them.
4. What happens to the content you already have. Most sites that have been blogging for years have pages that get no traffic and dilute the ones that do. Content pruning, deleting or merging the weak pages, is often the fastest early win, and an agency that only ever proposes adding pages has not looked.
5. Who does the work. Ask for the name of the person who will log into your site. On a £1,000 retainer it will not be the person who pitched.
6. The exit. Whito's retainer research recommends a performance review clause or a 30-day exit option. Visionary suggests a three-month initial term with 30 days' notice after that, and calls a 12-month minimum with no break clause a red flag. We agree with the second position.

Google adds one more test that we would put at the top. Ask whether they will share every change they make to your site, with reasons. Its guidance warns: "Be careful if a company is secretive or won't clearly explain what they intend to do."

How to read a monthly report

A useful SEO report shows enquiries from organic search, then the pages that produced them, then the work done that month, in that order. Rankings go at the end, if at all.

The most common failure we see is the gap between rankings and enquiries. Rankings go up, the agency celebrates, and the phone stays quiet. That happens when the terms being tracked are the ones the agency chose because they could move them, not the ones a customer types before buying. If your report leads with a ranking table, ask which of those terms produced a lead last month.

Two numbers belong in every report and rarely appear. The first is branded search: how many people typed your company name into Google this month compared with a year ago. It is the cleanest measure of whether anything you are doing, SEO included, is making more people want you specifically. The second is organic enquiries by landing page, which tells you which pages are earning their keep.

The pattern to watch for is reports replacing work. One agency owner on UK Business Forums describes clients who were "sold big marketing promises" and then paid an ongoing fee for a one-off setup plus monthly reports. His advice from that thread is to agree up front exactly what the agency does each month, and his line about what happens otherwise is blunt:

"The only time the agency does something is when leads drop or you complain." Shaun Gambit, UK Business Forums, May 2021

The same thread has an SEO consultant describing takeover jobs where the old agency owned the client's Google Analytics, Business Profile and Ads accounts, and the client could not leave. Check now that every account is in your name with the agency added as a user.

How long it takes

Expect to see movement in three to six months on an established site and six to twelve on a new one, and treat anyone who promises faster with suspicion. Google's SEO starter guide says only that "some changes might take effect in a few hours, others could take several months", and suggests waiting a few weeks before judging any single change.

A realistic six-month timeline for an established site runs roughly like this: month one is the audit, the technical fixes and the first service pages; months two and three are the remaining service pages and the Google Business Profile routine; months four to six are when the enquiries data starts to mean something and the content plan can be judged against it. A new site adds the time it takes Google to trust a domain nobody has linked to yet.

The one timeline promise worth refusing is a ranking. Google says it plainly: "No one can guarantee a #1 ranking on Google." If a proposal guarantees a position, the agency either does not know that or hopes you do not.

Where SEO stops in 2026

Organic search sends fewer clicks per search than it did two years ago, and an honest agency will say so before you sign. Pew Research tracked the browsing of 900 US adults in March 2025 and found that when a Google result page showed an AI summary, users clicked a traditional result 8% of the time, against 15% when there was no summary. Links inside the summary itself were clicked on 1% of visits. Summaries appeared on 18% of the searches in the sample.

That is US data and it is from 2025, but it is the best independent measurement published so far, and the direction is not in dispute. For a UK business the question is which of your own queries show an AI Overview. Informational searches ("how often should I service a boiler") increasingly do. Local commercial searches ("boiler service Northampton") mostly still show the map pack and ten blue links, and that is where a local retainer earns its money.

The zero-click problem has a second face. Your business can be named in an AI answer, from Google or ChatGPT or Perplexity, and nobody visits your site. That still counts for something, since people often search your name afterwards, which is one more reason to track branded search. It also means a 2026 retainer should include some work on AI visibility: checking what the engines say about you, fixing the third-party pages they draw from, and writing pages that can be quoted in a sentence. This is generative engine optimisation, and the research behind it is thin but growing. Google's own list of what an SEO does now includes it. If an agency has no answer on this, it is selling a 2022 retainer.

The limit we would state most plainly is that SEO cannot make up for a weak offer. A page can rank for "emergency plumber Northampton" and still lose the call to a competitor with more reviews and a phone number that is answered. An agency that asks about your reviews, your prices and your response time before it asks about keywords is the one to keep talking to.

The decision rule we would use is this: pay for the retainer only if you can name the three pages it will change this quarter and the one number it will be judged on in six months. If the agency cannot fill in those blanks, neither can you, and the report will fill the silence instead.

If you want a scoped SEO retainer that is priced on the work and reported on enquiries, send us the site and we will tell you what we would do first.