The verdict in three sentences
A well-built EN-NL-DE site costs between 6,000 and 15,000 EUR excl. VAT in 2026, the gap driven mainly by page volume and the choice between human translation and AI post-edited by a native. The real risk is not design but hreflang: misconfigured, it can cut your visibility on Google.de and Google.com by 20 to 40 %. For an export SME in Amsterdam, professionally reviewed technical German translation is non-negotiable: it is what earns credibility with an industrial buyer in Stuttgart or Cologne.
What each extra language actually costs
The common mistake is assuming a second language doubles the budget. In reality the base language (the technical foundation, design, multilingual CMS) is the bulk of the investment; each added language costs mainly translation and integration.
| Item | EN (base) | + NL | + DE |
|---|---|---|---|
| Design & foundation build | 4,500 EUR | included | included |
| Reviewed pro translation (30 pages) | 0 EUR | 1,800 EUR | 2,100 EUR |
| Integration & linguistic QA | 0 EUR | 900 EUR | 1,000 EUR |
| hreflang & sitemap config | 600 EUR | included | included |
| International SEO (local keywords) | 0 EUR | 800 EUR | 900 EUR |
| Cumulative total excl. VAT | 5,100 EUR | 8,600 EUR | 12,600 EUR |
Beyond 30 pages or with a dense technical catalogue, translation pushes the total toward 15,000 EUR. For German regulatory documentation (safety sheets, DIN standards), budget a specialist translator at 0.14-0.18 EUR/word instead of 0.10-0.12 EUR.
Human translation vs AI post-edited: the right trade-off
Raw AI translation must be banned on commercial pages: a German buyer spots an automated phrasing within three lines and loses trust. The winning 2026 model is AI post-edited by a native translator.
| Approach | Cost / word | Quality | Recommended use |
|---|---|---|---|
| Human translation only | 0.12-0.18 EUR | Excellent | Key pages, legal, technical DE |
| AI + native post-edit | 0.05-0.08 EUR | Very good | Blog, FAQ, secondary pages |
| Raw AI, no review | 0.00-0.01 EUR | Risky | Never in B2B production |
| Classic agency translation | 0.15-0.22 EUR | Excellent | Contracts, legal notices |
For a 30-page site, a smart mix (key pages human, secondary AI-reviewed) saves 30 to 40 % on translation without sacrificing credibility.
The hreflang pitfalls that cost traffic
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Hreflang tells Google which language version to serve which visitor. The most common errors: missing self-referencing tag, mismatch between hreflang and sitemap, wrong language codes (de-DE vs de), and no x-default version. Each loses qualified traffic. Budget a dedicated QA phase of 600 to 1,000 EUR to validate every URL with a tool like Screaming Frog before launch.
Mini case study
Thomas, export director of an industrial valve SME in Amsterdam, targets 40 % of revenue in Germany by 2027. He invests 12,600 EUR excl. VAT in an EN-NL-DE site with 30 pages, human German translation and validated hreflang. Six months after launch, organic traffic from Google.de rises from 90 to 640 visits/month, generating 14 qualified quote requests. With an average export deal of 8,500 EUR and a 25 % close rate, that is roughly 30,000 EUR of additional half-year revenue, reaching ROI by month five.
FAQ
Do I need a separate .de domain for Germany? No, a /de/ subdirectory with correct hreflang works in 90 % of cases and concentrates SEO authority on one domain. A separate .de costs more to maintain and fragments your ranking.
How long to deliver a trilingual site? Expect 6 to 9 weeks: 2-3 weeks design and foundation, 2-3 weeks translation and integration, 1-2 weeks linguistic and hreflang QA. Dense technical German lengthens the translation phase.
Can I add a 4th language later? Yes, if the CMS is built multilingual from the start. Adding Spanish or Italian will then cost 3,000 to 4,000 EUR (translation + integration + SEO), with no rebuild.
Is AI enough for commercial German? Not raw: business German demands precision and register. AI post-edited by a native is fine for blogs, but product and commercial pages must be reviewed by a specialist translator.
How do I measure multilingual ROI? Track organic traffic per language version, conversion rate per language, and attributed export revenue. A dashboard segmenting Google.nl, .de and .com shows within 3-4 months which languages pay off.
Let's scope your project. Tell us your page count, target languages and export market: we price the foundation, 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.

