The verdict in three sentences
For a London B2B website that needs to recover organic traffic, a senior independent SEO consultant paired with a specialist writer gives the best balance of expertise, cost and exit flexibility at 1,300 to 2,800 GBP a month. A specialist SEO agency earns its fee above roughly 3,000 GBP a month, when the site runs past 500 pages or targets several countries. An in-house SEO hire only pays off when there is a full-time workload, and a mid-level specialist in London costs around 55,000 to 70,000 GBP a year once employer costs are added (2026 estimate).
Five provider types ranked on stable criteria
Marketing directors at UK professional services firms rarely compare names; they compare delivery models. Each model carries its own cost structure, ramp-up time and lock-in risk. The ranges below are 2026 estimates for the London market, excluding VAT and any separately commissioned content.
| Rank | Provider type | Monthly retainer (ex VAT) | Initial audit | Typical term | Best fit |
|---|---|---|---|---|---|
| 1 | Senior consultant + writer | 1,300 to 2,800 GBP | 2,000 to 4,500 GBP | 6 months | B2B firms with 20 to 200 staff |
| 2 | Specialist SEO agency | 3,000 to 6,000 GBP | 4,000 to 9,000 GBP | 12 months | 500+ page sites, several markets |
| 3 | Packaged service with weekly report | about 160 to 450 GBP | about 130 GBP | 12 months | Tight budget, focused service pages |
| 4 | Junior freelancer | 600 to 1,200 GBP | 800 to 2,000 GBP | Rolling | Small sites, one-off fixes |
| 5 | Full-service digital agency | 1,000 to 2,500 GBP | Often bundled | 12 months | Redesign with SEO as an add-on |
The ranking does not reward the cheapest line. It weighs four criteria: total cost over 12 months, time to first deliverables, reversibility (can you leave with your content and your accounts?) and support quality (a senior person you can actually reach, or an account manager who changes every six months).
Total cost, ramp-up and exit terms
A monthly retainer hides the real spend. Add the audit, extra content, link acquisition if any, and the internal time your team spends reviewing drafts.
| Criterion | Senior consultant | Specialist agency | Junior freelancer | In-house hire |
|---|---|---|---|---|
| 12-month total (ex VAT) | 17,600 to 38,000 GBP | 40,000 to 81,000 GBP | 8,000 to 16,400 GBP | 55,000 to 70,000 GBP |
| Time to start | 2 to 3 weeks | 3 to 6 weeks | 1 week | 2 to 4 months to hire |
| Pieces of content per month | 4 to 6 | 8 to 12 | 2 to 4 | Depends on headcount |
| Reporting cadence | Monthly | Monthly or weekly | Ad hoc | Continuous |
| Exit flexibility | Good if accounts sit with you | Varies, negotiate it | Good | Full |
| Main risk | Limited capacity | Junior staff on your account | No strategy | Key person leaves |
Whatever you choose, three points belong in the contract. Content ownership transfers to you on payment. Google Search Console, GA4 and the rank tracker are registered to your company, not the supplier, which also keeps you on the right side of UK GDPR when analytics data is shared. Notice after the initial term is one month at most.
For UK targeting, check that the provider works with a .co.uk or a /uk/ folder strategy, writes in British English (optimise, not optimize) and understands that buyers in the City search differently from buyers in Manchester or Leeds.
Where Kolonell fits
Kolonell is one option among others, in third place, for firms that want measurable progress without a London agency budget. The Traffic Engine offer starts with a visibility audit at 100,000 FCFA (about 152 EUR), credited against setup if you start within 30 days, followed by three 12-month plans: Presence at 125,000 FCFA (about 191 EUR), Momentum at 225,000 FCFA (about 343 EUR) and Flood at 350,000 FCFA (about 534 EUR) a month, with a 300,000 FCFA setup (about 457 EUR). Progress is shared in a weekly report.
It is a poor fit if you need someone in your Canary Wharf office every week. It suits a services firm that wants to be found on its core commercial queries and track quote requests week by week.
Mini case study
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
Illustrative example: James, marketing director of a 70-person compliance consultancy in London, has lost 28 % of organic traffic in 18 months. He gets three proposals. A specialist agency asks 5,500 GBP for the audit and 3,500 GBP a month: 47,500 GBP over 12 months. A senior consultant quotes 3,000 GBP plus 2,000 GBP a month: 27,000 GBP. A junior freelancer quotes 1,200 GBP plus 900 GBP a month: 12,000 GBP.
One qualified lead is worth about 1,100 GBP of gross margin to the firm. The consultant needs 25 extra organic leads in a year to break even, the agency 44. With 140 pages and one market, James picks the consultant and writes ownership of Search Console and all content into the contract.
FAQ
How much does an SEO agency in London cost in 2026?
Retainers run from about 600 GBP a month for a junior freelancer to 6,000 GBP or more for a specialist agency, plus an audit of 800 to 9,000 GBP. Over 12 months, a specialist agency often exceeds 40,000 GBP.
Should I sign a 12-month SEO contract?
Competitive B2B queries usually take 6 to 9 months to move, so a 6-month initial term is reasonable. Beyond that, insist on a one-month notice clause if agreed KPIs have not improved by month 6.
Consultant or agency for a B2B website?
A senior consultant is usually enough for a site under 300 pages in one market, at 1,300 to 2,800 GBP a month. An agency makes sense once you manage several languages, countries or more than 500 pages.
How often should SEO reporting happen?
Monthly is the market norm, but a weekly report spots a ranking drop within 7 days rather than 30. At minimum, ask for clicks, impressions and enquiries attributed to Google.
How do I vet an SEO provider?
Ask for an anonymised audit with at least 30 prioritised recommendations and the KPIs tracked. Walk away from anyone guaranteeing a number one ranking in under 3 months.
Get found by the clients who are searching for you. Start with a visibility audit at 100,000 FCFA (about 152 EUR), then move to the Traffic Engine plan that fits your market to win more quote requests, tracked in a weekly report: Traffic Engine. WhatsApp +221 77 596 93 33.
Mohamed Bah
Fondateur, Kolonell
Passionate about digital and entrepreneurship in Africa, Mohamed has been helping Sénégalese businesses with their digital transformation since 2020. Founder of Kolonell, he believes every SME deserves a professional and accessible online présence.
