Your client’s RFP says: “Translations must comply with ISO 17100.” You look at this requirement and think: do we comply? If not, how much would it cost to get there? And will it actually pay for itself?
This is a typical situation for translation agencies and freelancers in 2026. Corporate clients increasingly demand ISO 17100 as a prerequisite for working together - but not everyone understands what the standard actually requires, what certification costs, or whether it genuinely improves translation quality.
As EUATC notes: the standard is currently under revision, and a new version (expected around 2029) will integrate ISO 18587 for machine translation post-editing. So if you’re planning to get certified - understand the current requirements, but keep in mind that the rules are about to change.
Let’s break it down.
What Is ISO 17100 and Why Does It Exist¶
ISO 17100:2015 is the international standard that sets requirements for translation service delivery. It replaced the earlier European standard EN 15038:2006 and became the global quality benchmark for Translation Service Providers (TSPs).
In plain English: it’s a set of rules describing HOW a translation company should operate - from translator qualifications to the revision process and final verification. Not what to translate, but how to organize the process so the output is consistently good.
Here’s the critical detail: ISO 17100 covers ONLY human translation. If you’re using machine translation + post-editing (MTPE), that falls under ISO 18587:2017. The standard explicitly states: raw output from machine translation plus post-editing is outside the scope.
What ISO 17100 Actually Requires¶
The standard breaks down into several requirement blocks. Let’s go through each.
Translator Qualifications¶
This is the strictest and most specific part. Every translator working on ISO 17100 projects must meet at least one of three criteria:
| Criterion | Details |
|---|---|
| Translation degree | Higher education in translation, linguistics, or language studies with significant translation training |
| Any degree + 2 years experience | Higher education in any field + equivalent of 2 years full-time professional translation experience |
| 5 years experience | Equivalent of 5 years full-time professional translation experience (no degree required) |
On top of that, translators must demonstrate: - Translation competence (ability to translate according to quality standards) - Linguistic competence (professional-level proficiency in both source and target languages) - Subject matter competence (understanding of the text’s domain) - Technical competence (ability to work with CAT tools, TM, terminology databases)
As BDÜ notes:
Die Qualität einer beglaubigten Übersetzung hängt nicht nur von den Sprachkenntnissen ab, sondern auch von der Fachkompetenz des Übersetzers im jeweiligen Rechtsgebiet.
Translation: knowing the language isn’t enough - the translator must understand the subject matter of the text they’re translating.
Mandatory Revision (Four-Eye Principle)¶
This is the second key element: EVERY translation must be revised by a different qualified translator. Not the same person who did the translation - a second pair of eyes.
The reviser checks: - Accuracy of the translation against the source - Terminological correctness - Style and register consistency - Grammar and spelling in the target language - Completeness (nothing omitted)
This “four-eye principle” is exactly what makes ISO 17100 difficult for solo freelancers. If you work alone, you technically can’t comply with the standard without a revision partner.
Process Management¶
The standard requires documented processes at every stage:
- Pre-production: client request analysis, scope assessment, assigning translators with appropriate competence
- Production: translation → revision → (optional) review → proofreading → final verification
- Post-production: delivery to client, file storage, feedback handling
Every stage must be described in internal documentation - who’s responsible, which checklists are used, how issues are tracked.
Resource Management¶
The agency must maintain: - A database of qualified translators with documented proof of each person’s qualifications - Translation Memory (TM) and terminology databases - Quality control tools - Confidentiality and data protection procedures
How Much Does Certification Cost¶
Specific numbers depend on organization size, but here are ballpark ranges:
| Cost Item | Small agency (2-5 people) | Mid-size agency (10-30 people) |
|---|---|---|
| Documentation prep (DIY) | 0 (your time) | 0 (your time) |
| Consultant for prep (optional) | $3,000-$7,000 | $7,000-$15,000 |
| Certification audit | $3,000-$5,000 | $5,000-$8,000 |
| Annual surveillance audit | $1,500-$3,000 | $2,500-$5,000 |
| Total (first year) | $3,000-$12,000 | $5,000-$23,000 |
| Annual maintenance | $1,500-$3,000 | $2,500-$5,000 |
The certificate is valid for 3 years with annual surveillance audits. After 3 years - full re-certification (complete audit again).
Major certification bodies include TÜV SÜD and Orion Assessment Services (the leading North American auditing firm for the language industry with 300+ clients).
As ISO QSL explains, what you’re paying for in an audit is the number of days needed to review your operations. If you combine ISO 17100 with ISO 9001 or ISO 18587 - auditors can cover everything in less time than separate audits, which saves you money.
The Certification Process: Zero to Certificate¶
Typical timeline for a small-to-medium agency - 3 to 6 months:
Month 1-2: preparation - Audit your existing processes: what already meets the standard, what needs to change - Create or update internal documentation: translation, revision, and translator selection procedures - Collect documentary proof of all translators’ qualifications (degrees, CVs, portfolios)
Month 2-3: implementation - Run new processes on real projects - Test runs: a few projects following the new procedures - Internal audit: check yourself before the external auditor does
Month 3-4: Stage 1 audit - The auditor reviews your documentation: does everything on paper meet the standard? - If non-conformities are found - time to fix them (usually 2-4 weeks)
Month 4-6: Stage 2 audit - The auditor checks how your processes work in practice - Interviews with translators, revisers, project managers - Review of actual projects: did they go through all the required steps? - If everything checks out - you get your certificate
The certification itself is not the hard part - it’s changing your daily habits. If you already run a tight ship with proper revision workflows, you’re 70% there. If you’ve been cutting corners on revision - that’s where the real investment is.
Who Needs ISO 17100 (and Who Doesn’t)¶
Who should get certified¶
Agencies working with corporate clients. Large companies, pharma, law firms, government tenders - they increasingly require ISO 17100 as a mandatory tender condition. According to TranslationCert, certified companies can charge 15-30% more and gain access to enterprise clients.
Agencies looking to go international. ISO 17100 is a global trust signal. A client in Germany or the US doesn’t know your local certifications, but ISO is understood everywhere.
Agencies with systemic quality issues. If you regularly get translations sent back for rework, hear complaints about inconsistency, or lose files - the standard’s processes will genuinely help fix this. According to Stoquart, mandatory revision reduces post-delivery corrections by 30-50%.
Who should NOT get certified (yet)¶
Solo freelancers. The standard requires revision by a second person - you can’t comply alone. Option: create a network with another translator for mutual revision, but this complicates logistics and increases costs. According to ITI, full certification for individual translators can be too expensive and complex.
Agencies working primarily with MTPE. ISO 17100 explicitly excludes machine translation from its scope. If 80% of your projects are AI + post-editing, you need ISO 18587, not 17100.
Very small agencies without corporate clients. If your clients are individuals who need a passport translated, or small businesses without tender requirements, ISO 17100 won’t give you significant ROI. Your clients choose based on price and speed, not certification status.
ISO 17100 vs ISO 18587 vs ISO 9001: Which One to Choose¶
Three standards, three different scenarios. Here’s the comparison:
| Criterion | ISO 17100 | ISO 18587 | ISO 9001 |
|---|---|---|---|
| Focus | Human translation | MT post-editing | General quality management |
| Scope | Translation services only | MTPE only | Any organization |
| Translator qualifications | Detailed requirements | Post-editor requirements | None specific |
| Mandatory revision | Yes (by a second person) | Yes (for full post-editing) | None specific |
| Machine translation | Excluded | Core focus | Not regulated |
| Certification cost | $3,000-$8,000 | $3,000-$8,000 | $5,000-$15,000 |
| Best for | Traditional agencies | MTPE providers | Large organizations |
As transpose.ch explains, you can combine ISO 17100 and ISO 18587 - and it makes sense for agencies offering both traditional translation and MTPE. The audit is conducted simultaneously, which cuts costs.
According to EUATC, the new version of ISO 17100 (expected ~2029) plans to integrate ISO 18587 into a single standard covering all workflows: human translation, machine-assisted, and hybrid. Key changes: shift from role-based to competence-based framework, emphasis on risk management, technology neutrality.
Does ISO 17100 Pay for Itself: Real ROI¶
Let’s run the numbers for a 5-person agency.
First year costs: - Certification audit: ~$4,000 - Time spent preparing documentation: ~80 hours × $50/hr = $4,000 - Total: ~$8,000
Potential benefits: - Access to tenders requiring ISO 17100: at least 2-3 new contracts per year - Rate increase of 15-30% for ISO-certified projects - 30-50% fewer reworks (thanks to mandatory revision)
According to TranslationCert, certified TSPs see revenue growth of 18-25% within two years. If your current annual revenue is $100,000, a 20% increase = $20,000 extra - which pays back the investment 2.5x in year one.
But this only works IF: - Your target clients actually require ISO 17100 - You’re committed to following the processes (not just getting a certificate for show) - Your market is corporate or regulated sectors
If you’re working exclusively with small businesses or individual clients - ROI will be minimal, because your clients don’t know and don’t ask about ISO.
Common Certification Mistakes¶
“We’re already good enough, ISO is just paperwork.” Sure, if you already have every translation revised by a second person, documented processes, and verified qualifications for all translators. Most agencies discover that “good enough” turns out to be “full of gaps” when an auditor starts asking specific questions.
Fake documentation. Some agencies create procedures “on paper” to pass the audit but don’t actually follow them in practice. The surveillance audit a year later will catch this - and you’ll lose the certificate, your money, and your reputation.
Ignoring freelancer qualifications. If you work with freelancers, you’re obligated to collect documentary proof of their qualifications. “They translate well, I checked” is not documentary proof. You need degrees, detailed CVs, or portfolios demonstrating 5 years of professional practice.
Certification for certification’s sake. ISO 17100 isn’t a marketing badge. It’s a quality management system. If you want a badge, it’s cheaper to make a nice banner for your website. If you want to genuinely improve your processes and access serious clients - then certification makes sense.
Alternatives: When ISO 17100 Isn’t Right for You¶
Not everyone needs full certification. Here’s what you can do instead:
Compliance without certification. Implement ISO 17100 processes (mandatory revision, translator qualifications, documented procedures) without going through official audit. Write “processes aligned with ISO 17100” on your website instead of “ISO 17100 certified.” For many clients, that’s enough.
ATA/ITI membership. For freelancers, membership in professional associations (ATA, BDÜ, ITI) can be a more effective quality signal than ISO certification.
EN 15038-based internal standards. Some agencies build their own quality framework based on ISO 17100 but adapted to their workflow. It’s cheaper and more flexible, though it doesn’t give you an official certificate.
If you’re a translation agency working with documents for visa and immigration processes, a more important quality signal for clients is real experience with specific document types. For example, ChatsControl uses a hybrid workflow (AI draft + sworn translator + revision) that follows the ISO 17100 principle of mandatory second-person review, even though the AI component technically falls outside the standard’s scope. For the client, the result is the same: the translation is verified by a qualified translator, and sworn translations carry legal force.
FAQ¶
How much does ISO 17100 cost for a small translation agency?¶
For an agency of 2-5 people - $3,000 to $12,000 for the first year (depending on whether you hire a consultant for preparation). Annual maintenance runs $1,500-$3,000. If you combine it with ISO 9001 or ISO 18587, the total audit cost goes down because it’s conducted simultaneously.
Can a freelancer get ISO 17100 certification?¶
Technically yes, but practically it’s tough. The standard requires mandatory revision by a second qualified person, so a solo freelancer can’t fully comply. Option: create a mini-network with another translator for mutual revision. Some organizations, like ITI, offer “ISO 17100 Qualified” status for individual translators - it’s qualification verification, but not full process certification.
What’s the difference between ISO 17100 and ISO 18587?¶
ISO 17100 covers traditional human translation and explicitly excludes machine translation. ISO 18587 is the standard for machine translation post-editing (MTPE). If you offer both human translation and MTPE - you need both standards. According to EUATC, by 2029 these standards are expected to merge into one.
Do clients actually require ISO 17100 certification?¶
Depends on the segment. Corporate clients, pharmaceutical companies, law firms, and government tenders increasingly include ISO 17100 as a mandatory requirement. Small businesses and individual clients usually don’t know about this standard and choose based on price and reviews.
How long does the certification process take?¶
3 to 6 months for an agency starting from scratch. If you already have documented processes and revision of every translation - it could be faster (8-12 weeks). The audit itself - Stage 1 (documentation) + Stage 2 (practice) - takes a few days.
Can you lose your certification after getting it?¶
Yes. The annual surveillance audit checks whether you continue to follow the standard. If the auditor finds serious non-conformities and you don’t fix them within the given timeframe - your certificate gets revoked. After 3 years, you need full re-certification.
Does ISO 17100 cover AI translation and MTPE?¶
No. The current version (ISO 17100:2015) explicitly excludes raw machine translation output and post-editing from its scope. For MTPE there’s a separate standard - ISO 18587:2017. But the upcoming revision of ISO 17100 (expected ~2029) plans to integrate both standards and cover hybrid workflows.
Is ISO 17100 recognized in all countries?¶
ISO is an international organization, and the standard is recognized globally. In the EU it’s known as EN ISO 17100:2015. A certificate from an accredited body is recognized in any country without additional procedures.