The verdict in three sentences
A bilingual B2B website in London costs 25 to 35% more than a monolingual one in 2026. The premium covers translation (per page), hreflang and dual-language SEO, all essential to reach additional markets. For an exporter, this premium is a commercial investment, not a comfort expense.
What multilingual really costs
Bilingualism is not simple duplication: it adds translation, technical structure and dual search optimisation. Here is the 2026 breakdown for a 10-page site in London (figures in local currency units).
| Item | Monolingual site | Bilingual site |
|---|---|---|
| Design & concept | 12,000 | 12,000 |
| Second-language integration | — | 3,500-6,000 |
| Translation (10 pages) | — | 800-1,500 |
| Hreflang & SEO structure | 1,500 | 3,000-4,500 |
| Testing & acceptance | 1,500 | 2,500 |
| Total | 15,000 | 20,000-26,500 |
The premium concentrates on second-language integration and dual SEO: these ensure that both search markets correctly index your two versions.
Overall budget and recurring costs 2026
Beyond the build, a multilingual site requires ongoing maintenance and SEO across two languages. Here are the reference ranges in London.
| Element | 2026 range |
|---|---|
| Full bilingual site | 15,000-40,000 |
| Delivery timeline | 5-9 weeks |
| Translation per page | 80-150 |
| Monthly maintenance | 700-2,000 |
| Monthly dual-language SEO | 1,000-3,000 |
| Additional bilingual page | 600-1,200 |
Budget annual maintenance of 8,400 to 24,000 and ongoing SEO if you genuinely target a second-language audience. An unmaintained bilingual site loses within 12 months the advantage paid for at build time.
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Mini case study
Sarah, export director of a London food SME (28 staff), wants to address additional European markets. Her monolingual site generated 4 enquiries/month, all domestic. She invests 24,000 in a bilingual version, plus 1,500/month in dual-language SEO. Within 6 months, the second-language version generates 5 extra enquiries/month from abroad. On an average export ticket of 35,000 and 4% conversion, those 5 enquiries are worth about 0.2 clients/month, i.e. 84,000 in additional annual revenue. The 9,000 bilingual premium plus 18,000 of annual SEO is recouped in under five months by the first signed export contract.
FAQ
How much exactly does going bilingual cost? Budget +25 to 35% of a monolingual site's price in 2026 in London, i.e. a 4,000 to 10,000 premium depending on page count and the complexity of dual SEO.
Is hreflang really essential? Yes: without correct hreflang tags, search engines can show the wrong language version to a user, which hurts conversion. It is a technical line item you should never cut on an export site.
Can I translate it myself to save money? Not advisable in B2B: rough translation undermines your credibility internationally. Professional translation at 80-150/page remains marginal against the commercial stakes.
What is the timeline for a bilingual site? 5 to 9 weeks in 2026, versus 4 to 6 for a monolingual one. Translation and dual acceptance add 1 to 3 weeks to anticipate in your export schedule.
Should SEO be maintained in both languages? Yes, otherwise the secondary version drops off. Budget 1,000-3,000/month of dual-language SEO to sustain visibility in the additional markets you target.
Let's scope your project. Tell us your target markets, page count and budget, and we will quote your bilingual site with the right SEO. 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.
