Three-year certification cycle
ISO 27001 Certification Cost Calculator
ISO 27001 is priced in audit days, not flat fees, and the certificate lasts three years with surveillance audits in between. This calculator shows the full cycle cost rather than just the headline Stage 2 invoice.
Your situation
Band: 26–100 employees. Certification bodies size audit days from headcount and site count.
Do you already have a risk register, policies and internal audit?
Most first-time certifications use one, at least for the gap assessment.
Increases audit days by roughly a third when certified in the same cycle.
Estimated cost
Estimated three-year ISO 27001 certification cost
$61,400 – $126,600
26–100 employees · initial certification plus two surveillance audits
| Cost line | Low | High |
|---|---|---|
| Certification body (Stage 1 + Stage 2)Accredited body audit-day fees for the initial certification cycle. Priced from audit days, which scale with headcount and site count. | $10,000 | $18,000 |
| Surveillance audits (years 2 and 3)Annual surveillance visits are roughly a third of the initial audit each. Shown here as the three-year total. | $5,000 | $10,800 |
| Compliance automation platformAnnual subscription covering the Annex A control mapping, policy templates and evidence collection. | $10,000 | $18,000 |
| ISMS consultant / implementation partnerGap assessment, Statement of Applicability, risk methodology and internal audit support. | $10,000 | $25,000 |
| Internal time (ISMS build + management review)240–480 hours at $85/hour. ISO 27001 needs risk treatment, internal audit and management review as living processes. | $20,400 | $40,800 |
| Penetration testUsed as technical evidence for Annex A 8.8 technical vulnerability management and requested by most enterprise buyers. | $6,000 | $14,000 |
| Total estimated first-year cost | $61,400 | $126,600 |
How this estimate is built
Accredited certification bodies quote from audit days. The number of days is derived from ISO/IEC 27006 guidance, which scales with the number of people performing work inside the ISMS scope, then adjusts for complexity, number of sites and technology diversity. Day rates in the US and Western Europe generally sit between $1,200 and $2,200, which is why headcount moves the total so sharply.
The certificate runs on a three-year cycle: Stage 1 (documentation readiness) and Stage 2 (implementation audit) in year one, then a surveillance audit in years two and three, each typically a third of the initial effort. We show the surveillance audits as a combined line so the three-year commitment is visible up front — this is the single biggest difference from a SOC 2 budget, which resets annually as one engagement.
The consultant line covers a gap assessment, risk methodology, Statement of Applicability, and internal audit support. It is optional in the calculator because teams with an existing SOC 2 program frequently skip it. Internal time is costed at $85 per fully-loaded hour, and does not disappear when you hire help: management review, risk treatment decisions and evidence ownership cannot be outsourced.
ISO 27001 vs SOC 2 on cost
| Dimension | ISO 27001 | SOC 2 |
|---|---|---|
| Who issues it | Accredited certification body | Licensed CPA firm |
| Output | Pass/fail certificate | Attestation report with auditor opinion and exceptions |
| Validity | Three years, with annual surveillance | Report covers a fixed period; buyers expect annual renewal |
| Pricing basis | Audit days from headcount and scope complexity | Fieldwork hours from systems, criteria and window length |
| Strongest in | Europe, Asia-Pacific, regulated procurement | US B2B SaaS procurement |
If you sell into both markets, price the combined path before choosing. Running both frameworks through one automation platform and one auditor engagement is usually 25–40% cheaper than sequencing them a year apart, which is what the multi-framework setting on the SOC 2 calculator models.