Guide
ISO 27001 certification cost UK: what to budget in 2026
Updated
ISO 27001, the information security management standard, is the certification technology buyers ask for, and it costs more than ISO 9001 because there is more to build and more to audit. Typical 2026 ranges below; the spread is wide, so treat them as budgeting guidance and get quotes.
Typical ISO 27001 costs, small UK organisation
| Item | Typical cost (2026 quotes) |
|---|---|
| Consultancy and implementation | £4,000–£10,000+ |
| Initial certification audit (stage 1 + 2) | £1,500–£4,000 |
| Annual surveillance audit | £1,000–£2,500 |
| Supporting tooling (risk register, policy platform), optional | £0–£2,000 per year |
These ranges are typical 2026 quotes and vary more than ISO 9001 figures do, because the audit scope follows your technology estate, not just your headcount. A 10-person SaaS company with cloud infrastructure, customer data and a development pipeline can cost more to certify than a 40-person office-based firm.
Why it costs more than ISO 9001
- Risk assessment is the core of the standard: you must identify information assets, assess risks and justify which of the standard's controls apply, real analytical work that most firms buy help with.
- More controls to implement and evidence: access control, cryptography, supplier security, incident management, business continuity and more, each needing policy and proof.
- Audits take longer because the auditor samples technical controls, not just documents, and audit time is priced per day.
Keeping the budget honest
- Scope tightly. Certify the systems and services your customers care about; an over-broad scope inflates every later cost.
- Decide the consultancy split early. If you have security-literate staff, buy review days rather than a full build; that alone can halve the implementation line.
- Ask about combined quotes if you also hold or want ISO 9001: integrated audits share days and cost less than two separate cycles.
- Compare accredited quotes only. The certificate mills described in the UKAS guide are especially active around ISO 27001; a certificate a security-conscious buyer rejects is worthless.
If buyers are asking about security but not naming ISO 27001, the UK government-backed Cyber Essentials scheme is a much cheaper baseline (fixed self-assessment fees in the hundreds of pounds) and can be a sensible first step while an ISO 27001 project runs.