The verdict in three sentences
A FR/EN B2B site is not a mere translation: it is a second sales journey designed for a foreign buyer. Expect a 30 to 50 % premium over a monolingual budget, most of it going into professional translation and technical structure (hreflang, routing). The payoff shows up in export revenue, which commonly targets 25 to 40 % of turnover when the effort is genuine.
What multilingual really costs
The premium comes not from a "language switch" but from the actual content to produce and maintain. Technical B2B translation is billed per word, with review by a native speaker of the sector.
| Item | 2026 ballpark (EUR excl. tax) | Note |
|---|---|---|
| Overall multilingual premium | +30 to +50 % of site budget | vs monolingual version |
| Pro translation FR→EN | 0.12 to 0.20 EUR/word | native review included |
| Typical 20-40 pages volume | 900 to 1,800 EUR | ~7,500 to 12,000 words |
| Second-language integration | 1,500 to 3,500 EUR | routing, hreflang, templates |
| Additional lead time | +3 to 5 weeks | translation + integration |
| Multilingual maintenance | +80 to 150 EUR/month | double content to keep current |
The classic trap: translating French marketing word for word. An English-speaking buyer expects localised arguments (standards, references, units), not a literal copy.
Human, AI or hybrid translation?
All three approaches coexist in 2026. AI alone remains risky on high-stakes commercial pages.
| Approach | Indicative cost | B2B quality | Recommendation |
|---|---|---|---|
| Professional human | 0.12-0.20 EUR/word | High | Key pages, offers, home |
| AI + post-editing | 0.05-0.09 EUR/word | Good | Blog, secondary pages |
| Raw AI | ~0.01 EUR/word | Unreliable | Internal draft only |
| Dedicated sector translator | 0.18-0.25 EUR/word | Very high | Legal, deep technical |
Winning strategy: human on the 8 to 12 conversion pages, hybrid AI + post-editing on background content.
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Mini case study
Marc, export director of an industrial SME in Nantes, wants to prospect in the UK and Benelux. His FR site has 30 pages. Translation: 10,000 words at 0.15 EUR = 1,500 EUR. EN integration: 2,500 EUR. Total premium ~4,000 EUR on a 12,000 EUR site, i.e. +33 %. Goal: raise exports from 18 % to 30 % of turnover (2.4M EUR), i.e. +288,000 EUR of targeted revenue. Even at 8 % net margin, the multilingual investment pays back within a few orders.
FAQ
Do I need a .co.uk domain or an /en/ subfolder? For an SME, an /en/ subfolder on the main domain is the best cost/SEO ratio in 2026: it leverages the domain's authority and costs 0 EUR extra, versus 15 to 30 EUR/year and authority starting from scratch for a ccTLD.
How long to deliver the EN version? Plan 3 to 5 weeks more than the FR-only site: translating 20-40 pages takes 1 to 2 weeks, integration and hreflang testing 1 to 2 weeks.
Can I add English later? Yes, if the architecture is designed multilingual from the start (routing, templates). Otherwise, retrofitting costs 20 to 40 % more than an initial bilingual design.
What maintenance budget should I plan? A bilingual site requires +80 to 150 EUR/month of extra maintenance, since every content update must be mirrored in both languages.
Is Google Translate enough to start? Not for commercial pages: tone and terminology errors damage B2B credibility. Reserve AI for secondary content, with human post-editing.
Let's scope your project. Tell us the page count, target languages and markets, and we'll price the multilingual premium and precise timeline. 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.
