The verdict in three sentences
A well-built multilingual B2B site relies on clean i18n architecture (subdirectory /en/ recommended), correct hreflang tags and professional, not automatic, translation. The 2026 extra cost breaks down into 2,000 to 5,000 EUR excl. tax of setup, 0.10 to 0.18 EUR/word of translation and maintenance multiplied by roughly 1.4. The main risk is not cost but a faulty hreflang that makes your language versions cannibalise each other in Google.
Architecture: subdomain vs subdirectory
The structural choice drives international SEO and maintenance. The subdirectory concentrates domain authority; the subdomain or country domain disperses the signal but targets geographically.
| Architecture | Example | SEO strength | Complexity |
|---|---|---|---|
| Subdirectory | site.com/en/ | High (shared authority) | Low |
| Subdomain | en.site.com | Medium | Medium |
| Country domain (ccTLD) | site.co.uk | Strong geo targeting | High, costly |
| URL parameter | site.com/?lang=en | Low (discouraged) | Low |
For a FR/EN B2B site, the subdirectory is the best 2026 compromise: simple, pools authority and declares cleanly in hreflang.
Cost per additional language 2026
Each language adds translation, integration and maintenance. Here are orders of magnitude for a ~15-page B2B showcase site (about 12,000 words).
| Item | Cost 2026 (EUR excl. tax) | Note |
|---|---|---|
| i18n setup (technical) | 2,000 - 5,000 | Once, all languages |
| Pro translation / language | 1,200 - 2,160 | 12,000 words x 0.10-0.18 EUR |
| Hreflang integration | 500 - 1,200 | Per project |
| SEO per language | 800 - 2,000 | Local keywords |
| Maintenance | x1.4 vs monolingual | Recurring |
| Arabic (RTL) | +30 - 50% integration | Reversed reading direction |
A full English version of a 15-page FR site therefore typically costs 4,500 to 8,000 EUR excl. tax all-in in 2026.
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Mini case study
Mehdi, export director of a food-processing SME in Casablanca, wants to target Europe and the Gulf in FR, EN and Arabic. His 15-page FR site is redesigned with a subdirectory architecture. i18n setup costs 3,800 EUR, EN translation 1,900 EUR, Arabic (RTL) 2,400 EUR including integration, plus 1,000 EUR of hreflang. Total: about 9,100 EUR excl. tax. By month 4, English-language organic traffic generates 6 export quote requests/month worth an average 4,000 EUR margin: the multilingual site pays back in under one sales quarter.
FAQ
Subdirectory or subdomain for multilingual? The subdirectory (/en/) is recommended in 2026: it pools the main domain's authority and simplifies management. A country domain is justified only for very strong geographic targeting.
Can I use machine translation? For a B2B site, not in production. Raw machine translation harms credibility and SEO. Plan professional translation at 0.10-0.18 EUR/word, optionally reviewed after an AI pre-translation.
What wrecks hreflang? Classic errors: wrong language/country codes, missing self-referencing tag, non-reciprocal versions. A broken hreflang makes pages cannibalise each other and can crash traffic.
How much does an extra language cost? For ~12,000 words, budget 1,200 to 2,160 EUR of translation plus integration. Arabic RTL adds 30 to 50% of integration due to the reversed reading direction.
Does maintenance increase a lot? Yes, budget roughly x1.4 versus a monolingual site: every content update must be reflected and retranslated across all languages.
Let's scope your project. Give us the page count, target languages (FR/EN/Arabic...) and target markets: we'll cost the i18n architecture, translation and hreflang. 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.
