ISO 27001 vs SOC 2 for Professional Services Firms: Which Certification Do You Need?
ISO 27001 and SOC 2 are both information security certifications that professional services firms are asked to demonstrate. They serve different markets, have different requirements, and carry different implications for a UK-based professional services firm. Understanding the differences — and which certification to pursue first — is an important strategic decision for any firm investing in formal information security certification.
ISO 27001 is recognised by 95% of UK enterprise procurement functions; SOC 2 is primarily a North American standard.
Frequently Asked Questions
What is the main difference between ISO 27001 and SOC 2?
ISO 27001 is an internationally recognised standard that certifies an organisation has implemented an Information Security Management System (ISMS) meeting the requirements of the standard. It is a certification awarded by an accredited body. SOC 2 is an audit standard developed by the American AICPA that produces an audit report assessing whether a service organisation's controls meet the Trust Services Criteria. ISO 27001 produces a certificate; SOC 2 produces a report. ISO 27001 is globally recognised; SOC 2 is primarily a North American standard.
Which certification do UK enterprise clients most commonly require?
ISO 27001 is overwhelmingly the more commonly required certification in UK procurement. UK public sector contracts, UK financial services clients, NHS and healthcare clients, and most UK enterprise clients will accept ISO 27001 as evidence of information security maturity. SOC 2 is typically only required by US companies or UK firms with substantial US client bases. For UK professional services firms, ISO 27001 should be the first priority.
Can we get both ISO 27001 and SOC 2?
Yes, and for firms serving both UK and US enterprise clients, both may ultimately be required. The controls required by the two standards overlap significantly — a well-implemented ISO 27001 ISMS provides a strong foundation for a SOC 2 audit. Compliance automation platforms (Vanta, Drata, Sprinto) can map controls to both frameworks simultaneously, reducing the additional effort of maintaining both certifications. Plan ISO 27001 first; add SOC 2 once the ISMS is established.
How do the costs compare between ISO 27001 and SOC 2?
ISO 27001 first-year costs (consultancy support, tooling, certification audit): £15,000–£40,000 depending on firm size and complexity. Ongoing annual costs: £5,000–£15,000. SOC 2 Type II first-year costs (readiness consulting, compliance tooling, CPA audit): £25,000–£60,000. Ongoing annual costs: £15,000–£30,000. The difference reflects the additional observation period and the cost of using a AICPA-licensed CPA firm rather than a UKAS-accredited certification body.
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