The verdict in three sentences
Taking a corporate site multilingual costs 25-45 % more than the monolingual version, most of it going into technical i18n (EUR 2,000-6,000) and translation (EUR 0.10-0.18/word). A Berlin mid-market firm targeting export must budget not only the launch but multilingual maintenance (+20 %) and the hreflang strategy. The classic trap: translating the copy but forgetting international SEO, URLs, meta tags and dynamic content.
Where the multilingual premium comes from
A bilingual site is not "the same site twice". You need an i18n architecture (per-language routing, hreflang, fallback), a back office that manages translations, layouts that absorb text expansion (German is +30 % longer, Arabic forces RTL) and a recurring translation budget for every update.
| Item | Monolingual | Bilingual DE/EN | Trilingual +FR/AR |
|---|---|---|---|
| Technical i18n (next-intl, hreflang) | - | 2,000 - 4,000 | 3,500 - 6,000 |
| Layout adaptation | included | +800 - 1,500 | +1,500 - 3,000 (RTL) |
| Translation (8,000-word site) | - | 800 - 1,440 / language | same x language |
| Native proofreading | - | 300 - 600 / language | 300 - 600 / language |
| International SEO | - | 1,000 - 2,500 | 1,800 - 4,000 |
| Multilingual maintenance | base | +20 % | +30 - 40 % |
For a base B2B site at EUR 12,000, the DE/EN version typically rises to EUR 15,000-17,500, i.e. the well-known +25 to +45 %.
Translation: human, AI or hybrid?
| Approach | Cost / word 2026 | Quality | Recommended use |
|---|---|---|---|
| Professional human | EUR 0.10 - 0.18 | Excellent | Commercial pages, legal |
| AI + native proofreading | EUR 0.04 - 0.08 | Good | Blog, listings, volume |
| Raw AI | ~EUR 0.01 | Risky | Never in premium B2B |
For an 8,000-word site, professional translation costs EUR 800-1,440 per language, the hybrid AI+proofreading EUR 320-640. Decide page by page: commercial content human, blog hybrid.
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Mini case study
Lena, export director of an industrial-components mid-market firm in Berlin, rolls out a DE/EN/FR site to prospect France and the UK. Base DE budget: EUR 14,000. Multilingual premium: i18n EUR 3,800, translation 8,000 words x 2 languages professional (EUR 2,600), international SEO EUR 3,200, layout adaptation EUR 1,200, i.e. +EUR 10,800 (77 % here as premium trilingual). Total EUR 24,800. Target: 15 export leads/year at EUR 12,000 average order. A single signed contract repays half the multilingual premium.
FAQ
What exactly does going bilingual cost? Expect +25 to +45 % of the monolingual budget for DE/EN. On a EUR 12,000 site, that is EUR 3,000-5,400 extra, i18n and translation included.
Is AI enough to translate a B2B site? For high-volume blog and listings, AI + native proofreading (EUR 0.04-0.08/word) is fine. For commercial and legal pages, human translation (EUR 0.10-0.18/word) remains essential.
One domain per country or subdirectories? In 2026, /de/ /en/ subdirectories with hreflang are recommended for an SME: better authority transfer and single hosting cost. ccTLDs (.fr, .co.uk) make sense at higher budgets.
How much extra time? Expect 2 to 4 extra weeks per language for translation, proofreading and integration. Arabic RTL often adds 1-2 weeks for layout adaptation.
Does maintenance cost more? Yes, multilingual maintenance adds roughly +20 % because every update must be translated and re-integrated across all languages. Budget for recurring content work.
Let's scope your project. Tell us your target languages, word count and base budget: we'll cost i18n, translation and international 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.
