The verdict in three sentences
Serious local B2B SEO in London starts with an audit of 1,500 to 4,000 EUR, followed by a monthly retainer of 800 to 2,500 EUR depending on how competitive your keywords are. The first measurable results (rankings, qualified traffic) appear in 3 to 6 months, rarely sooner. Over twelve months, an SEO lead costs 3 to 5 times less than a Google Ads lead, because the traffic you earn keeps working with no recurring media spend.
What you actually pay for local B2B SEO
Local SEO combines three workstreams: the Google Business Profile (listing, reviews, categories, posts), local pages optimised per service + city query, and link building (inbound links from regional and industry sites). In London, a competitive B2B market, the budget depends mostly on the number of target queries and how entrenched your competitors are.
| Local SEO service (London, 2026) | Range EUR | Time to result |
|---|---|---|
| Initial SEO audit | 1,500 – 4,000 | Delivered in 2-3 weeks |
| Monthly retainer | 800 – 2,500 /month | 3-6 months |
| Content campaign (per article) | 500 – 1,500 | 2-4 months to rank |
| Google Business Profile optimisation | 600 – 1,500 (one-off) | 1-3 months |
| Link building (per quality link) | 150 – 600 | 1-4 months |
A provider promising first position within a month with no audit is selling smoke: always insist on a costed diagnosis before you commit.
SEO vs Google Ads: the cost-per-lead maths
SEO is an investment, Ads is a rental. The difference shows over twelve months, when organic traffic compounds at no marginal cost while every Ads click stays billable.
| Criterion (B2B London, 2026) | Local SEO | Google Ads |
|---|---|---|
| Average monthly cost | 1,500 EUR | 2,500 EUR + management |
| Cost per service click | 0 (organic) | 3 – 12 EUR |
| Leads/month (months 6-12) | 20 – 40 | 15 – 30 |
| Cost per lead (month 12) | 40 – 90 EUR | 120 – 350 EUR |
| Persistence when budget stops | Traffic retained | Traffic to zero |
2026 order of magnitude: SEO turns profitable past month 6 and widens the gap thereafter.
Mini case study
Julien, owner of an industrial maintenance SME in East London, spends 3,000 EUR/month on Google Ads to generate 25 leads (cost per lead: 120 EUR). He invests in a 2,800 EUR audit then an 1,800 EUR/month SEO retainer. By month 8 he generates 22 SEO leads/month at near-zero marginal cost, cutting his cost per lead to 82 EUR and toward 50 EUR by month 12. Projected annual saving versus all-Ads: about 14,000 EUR, plus an SEO asset that keeps producing.
Need a professional website?
Kolonell builds websites that attract clients, optimized for the Sénégalese market. Free quote in 2 minutes.
FAQ
How long before I see local SEO results?
Expect 3 to 6 months for stable rankings on service + city queries, longer on very competitive keywords. A well-optimised Google Business Profile can climb in 1 to 3 months.
Is a minimum term required?
Yes, SEO compounds: most agencies ask for 6 to 12 months. Below 6 months you pay without reaping the traffic your actions have matured.
Is link building essential?
In a competitive London B2B market, yes. Budget 150 to 600 EUR per quality link; 3 to 6 links/month is often enough to shift stubborn positions.
How do I measure the return of an SEO retainer?
Demand monthly reporting on three indicators: rankings on your target queries, qualified organic traffic, and above all leads generated (forms, calls). A good provider ties activity to revenue.
SEO or Ads to start?
Both: Ads for immediate leads while SEO ramps up, then a gradual shift to SEO as the organic cost per lead collapses.
Let's scope your project. Tell us your priority service queries, your zone (London, Greater London) and an indicative monthly budget: we will cost the audit plus retainer. Detailed quote within 48 h. 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.
