How much does ISO 27001 certification cost?
The honest answer: it depends on your size, scope, and readiness — but published ranges are narrower than most CB sales teams admit. Start with the estimator, then see what drives the number.
Published 2026 sources put the Stage 1 + Stage 2 audit fee around $8,000 to $25,000 for a small-to-mid company, with first-year all-in costs (implementation, tooling, audits) of $15,000 to $50,000 for SMBs (our synthesis of the cited sources below). Every figure below is labeled with its source.
ISO 27001 cost estimator
How this estimate is calculated (formula & assumptions)
Audit-fee bands by size are interpolated from published 2026 ranges: Stage 1+2 ~$8k–$25k for small-to-mid companies (Cataam); SMB first-year all-in $15k–$50k (AxiPro); UK small-org real-quote data (£6,250+ accredited audit, £1.5k–£3.1k surveillance; iseoblue). Multi-site: +50% (extra audit days). ISO 27701 extension: +15%. Implementation/gap work: 40–70% of the audit fee from scratch, 15–35% with partial controls. Tooling: $5k–$30k/yr. Internal staff time excluded. Surveillance years 2–3: $4k–$10k/yr (Cataam).
Worked example (no JavaScript needed)
A 50-person SaaS company, single site, ISO 27001 only, with some controls already in place:
- Audit fees (Stage 1+2): $12,000–$25,000 (published planning-range band for this size)
- Implementation/gap work: 15–35% of the audit fee → $1,800–$8,750
- Compliance tooling: $5,000–$30,000/year
- Total: roughly $19,000–$64,000, excluding internal staff time.
Bands are interpolated from the published sources cited below — see the formula disclosure above for the exact math.
Your estimate is a starting point. Estimates use published planning ranges (sources: 2026 pricing report). A scoped quote is what a CB actually charges you — get 2–3 and compare.
Get scoped quotesISO 27001 cost by company size
The single most-asked cost question is size-keyed: what does it cost for a company like ours? The table below gives planning estimates interpolated from the published ranges above — not quotes, and not measured averages. See the pricing report for every underlying source.
| Company size | Audit fees (Stage 1+2) | Tooling | First year, all in |
|---|---|---|---|
| ~20 people (seed startup) | $8K–$15K | $5K–$10K | $15K–$40K |
| ~50 people (Series A) | $12K–$25K | $8K–$20K | $25K–$60K |
| ~150 people (growth stage) | $20K–$40K | $15K–$30K | $50K–$100K |
Estimate basis: audit-fee bands interpolate Cataam's ~$8k–$25k small-to-mid band, AxiPro's SMB all-in range, and planning ranges in our certification-body directory; tooling $5k–$30k/yr; all-in adds implementation/gap work and surveillance. Multi-site programs move you up the range.
Industry context changes scope: fintech and healthtech companies often add ISO 27701, while SaaS startups can often certify a tight cloud-only scope first.
What the published data says
| Source | Key figures | Source date |
|---|---|---|
| iseoblue — “ISO 27001 Certification Cost UK (2026): Real Quotes + Calculator” | Small org year one: £6,000–£15,000 · UKAS-accredited cert audit: £6,250–£10,000 · Surveillance: £1,500–£3,100/yr · Implementation support: £2,000–£8,000 (consultant-written, from real quotes) | Updated Sept 2026 |
| Cataam — “How Much Does ISO 27001 Certification Cost in 2026?” | Stage 1+2 audit (small-to-mid company): ~$8,000–$25,000 · Surveillance: ~$4,000–$10,000/yr · Lead Implementer / Lead Auditor training + exam: ~$1,000–$3,000 per person | Published 2026 |
| AxiPro — “ISO 27001 Certification Cost in 2026: Full Breakdown” | SMB first-year all-in: $15,000–$50,000 · Cloud-native startup: $10,000–$25,000 · Ongoing: $5,000–$25,000/yr · Audit day rates: $1,500–$2,200/day (US), £1,000–£1,500 (UK) | Published 2026 |
| CyberPulse — “Cost of ISO 27001 Certification in Australia (2026 Guide)” | Small (<25 staff) first year: AUD 18,000–35,000 · Medium (25–250): AUD 35,000–75,000 · Large: AUD 75,000–150,000+ · Internal audit from AUD 8,500 | Published 2026 |
| High Table — “ISO 27001 Certification Cost [2026 update]” | UK small org (1–10 employees): ~£6,250 minimum · Large enterprises: £50,000+ · Auditor day rate ~£1,250/day (per ISO/IEC 27006 tables) · Standard PDF: £120–£160 | Published 2026 |
| eShield IT — “ISO 27001 Certification UAE 2026” | CB fee Stage 1+2: AED 12,000–20,000 (small) / 20,000–35,000 (medium) / 30,000–50,000 (large) · Surveillance: AED 8,000–12,000/yr (small) · Total first year (small): AED 56,000–97,000 | Published 2026 |
What drives your price
- In-scope headcount. Audit days are set by ISO/IEC 27006 tables from your in-scope headcount — the single biggest fee driver. Scoping tightly is the cheapest lever you control.
- Number of sites. Each site adds audit days. Multi-site programs cost substantially more than single-site ones.
- Added schemes. ISO 27701, ISO 27017/27018, or bundled SOC 2 add audit days and fees.
- Readiness. Walking in with an operating ISMS and organized evidence is the cheapest lever you control.
- CB choice. Boutique and regional CBs often price below premium global brands for the same accredited certificate. The certificate's accreditation matters, not the logo size.
Know your scope? Tell us your size, sites, and timeline once — matched CBs send scoped, comparable quotes. Free · 2 minutes · no obligation.
Request quotesThe costs nobody quotes you
The audit invoice is usually the smaller half. Published breakdowns add: implementation consulting (£2k–£8k for small orgs), internal staff time, compliance tooling, and training (£/$1k–$3k per person for Lead Implementer courses). Budget the all-in number, not the quote.
Frequently asked
What is the average cost of ISO 27001 certification?
Published 2026 sources put the Stage 1 + Stage 2 audit fee around $8,000 to $25,000 for a small-to-mid company, with first-year all-in costs (implementation, tooling, audits) of $15,000 to $50,000 for SMBs. Enterprise or complex programs exceed $100,000. See the sourced figures below.
What drives ISO 27001 cost up the most?
In-scope headcount (audit days are set by ISO/IEC 27006 tables), number of sites, scope breadth, added schemes like ISO 27701, and how ready your ISMS is on day one. Multi-site and multi-country programs push you up the range fast.
How much do surveillance audits cost?
Annual surveillance audits in years two and three typically run one-third to one-half the Stage 2 duration — published sources put most SMB surveillance fees at $4,000 to $10,000 per year.
Do costs drop after the first year?
Yes. Year two and three are mostly the surveillance audit plus tooling — a fraction of first-year implementation costs. Recertification in year four is a larger audit again, roughly Stage 2 scale.
Does a non-accredited certificate cost less?
Yes, and it's a trap: enterprise procurement routinely rejects unaccredited certificates. Published UK data shows the accredited premium buys you the only certificate that counts — budget for an accredited CB from the start.
How much does ISO 27001 cost for a 20-person startup?
Planning estimate: roughly $15,000–$40,000 all-in for the first year (audit fees $8K–$15K plus tooling, gap work, and staff time). That is our estimate interpolated from published ranges — get scoped quotes for your actual situation.
- iseoblue — “ISO 27001 Certification Cost UK (2026): Real Quotes + Calculator”
- Cataam — “How Much Does ISO 27001 Certification Cost in 2026?”
- AxiPro — “ISO 27001 Certification Cost in 2026: Full Breakdown”
- CyberPulse — “Cost of ISO 27001 Certification in Australia (2026 Guide)”
- High Table — “ISO 27001 Certification Cost [2026 update]”
- eShield IT — “ISO 27001 Certification UAE 2026”
Get your actual number
Estimates are a starting point. Get scoped, comparable quotes from accredited CBs in 2 minutes.
How it works: tell us once (4 questions, 2 min) → we match licensed auditors to your size and scope → they send scoped quotes directly. Free, no obligation.