What Does ISO 27001 Certification Cost?

For a 51 to 200 person company, we plan ISO 27001 certification against four lines: gap analysis at $35,000 to $60,000, remediation at $50,000 to $100,000, certification audit fees at $30,000 to $55,000, and ongoing maintenance at $20,000 to $40,000 a year. Those are Top Floor planning bands, the same four rows our budget planner prices for ISO 27001 at its mid-market base, not a market survey, and this page says so plainly because the alternative is worse: the third-party ranges circulating for this query trace to vendor content with no methodology, and no accredited certification body will quote you a fee without first deriving audit days for your specific scope. What follows is what each line covers, why company size moves all four, what deliberately sits outside the bands, and how the recurring costs behave after the certificate arrives.

Key takeaways

• Four planning lines for a 51 to 200 person company: gap analysis at $35,000 to $60,000, remediation at $50,000 to $100,000, certification audit fees at $30,000 to $55,000, and ongoing maintenance at $20,000 to $40,000 a year.
• These are our own planning bands, stated as such. They are the same rows the budget planner prices, kept identical on purpose so the site gives one answer.
• Company size moves every line, because certification bodies derive audit days from your personnel count and scope. Smaller companies land below these bands, larger ones above.
• The bands exclude internal staff time, the platform subscription, and an outsourced internal audit, each of which is real money with its own page.
• The certificate is not the end of the spend. Surveillance audits, the internal audit programme and management review recur every year, and recertification arrives on a three-year cycle.

The four lines, and what sits inside each

Two properties of that table matter more than any single number. First, the one-time lines dominate year one and then disappear, while the maintenance line never does; buyers who budget the certificate and not the system are surprised in year two, not year one. Second, the remediation band is the widest because it is the line most driven by your starting posture: a company with mature controls and thin documentation buys mostly writing, while a company with real control gaps buys engineering, and the two are not the same project at the same price.

Adding up the low ends of the three one-time lines gives $115,000; adding up the high ends gives $215,000. That is arithmetic on our own planning bands for a 51 to 200 person company, stated so you can check it, not a market figure.

Why company size moves every line

The bands above sit at the planner's mid-market base, a 51 to 200 person company. The budget planner applies size multipliers around that base, scaling the same four rows down for companies of 50 or fewer and up for companies in the hundreds or thousands, alongside adjustments for existing security maturity and timeline pressure. The mechanism behind that is not arbitrary: certification bodies derive their audit days from your effective personnel count and scope, so the audit fee genuinely is a function of size, and the gap and remediation lines scale with the number of systems, sites and people the ISMS has to cover. The practical consequence for quotes is the one our consultant-or-platform guide turns into a checklist: ask each accredited body for the audit days it derived under ISO/IEC 27006-1 and compare the days before comparing day rates, because a price built on fewer days than the derivation supports is an accreditation problem arriving later.

What is deliberately not in these bands

Four real costs sit outside the table, each with its own page rather than a number invented here.

Internal staff time. The largest unbudgeted line in most first certifications. The planning shape we use is roughly 300 to 700 hours of internal staff time for a first ISO 27001 certification, our own planning figure rather than a survey result, with the extra weight relative to other frameworks sitting almost entirely in the ISMS documentation: the risk assessment, the Statement of Applicability, internal audit records and management review minutes.

The compliance platform. Most programmes run an automation platform for evidence and control monitoring. The subscription is a vendor line, and whether it substitutes for expert help at all is the subject of do you need an ISO 27001 consultant or just a platform.

An outsourced internal audit. Clause 9.2 requires internal audits by someone impartial, which small companies often cannot staff internally. Can you outsource the ISO 27001 internal audit covers who is allowed to do it and how to make quotes comparable; that page deliberately publishes no market range, and this one does not either.

Consulting support. Whether you buy help at all depends on whether anyone on staff has built a management system before and whether a customer deadline is real; the honest decision tree is in the consultant guide above, including the cases where the right purchase is nobody.

After the certificate: the three-year rhythm

ISO 27001 money does not stop at certification, and the recurring shape is worth budgeting explicitly. The certificate runs on a three-year cycle: surveillance audits in the years between, then a recertification audit, with the annual internal audit programme and management review running underneath throughout, a cadence our ISO 27001 and SOC 2 comparison sets against the SOC 2 annual cycle. The ongoing maintenance band, $20,000 to $40,000 a year, is what we plan against for operating that rhythm: surveillance support, the internal audit, risk reassessment and evidence upkeep. Surveillance years cost less than the initial certification year because the audits are smaller in scope, but the management system itself has to keep running between them, which is why the recurring line is a programme cost and not an audit fee.

Why we publish our own bands and no third-party range

Two of our own pages already record the policy this page inherits. The comparison article declines to print circulating ISO 27001 dollar line items because the ranges in circulation mislead more than they inform, and the consultant guide points buyers at derived audit days instead of at a market number. This page adds the piece those two deliberately left out: the planning bands we actually use, published as ours, kept identical to the budget planner so the site states one set of numbers for one named thing. What we still do not print is a third-party market range, because none we found survives being checked, and a cost page that launders an unverifiable number into a confident answer is the failure this site audits itself against.

Where Top Floor fits

Our ISO 27001 practice covers the management-system layer these bands price: scope, risk assessment, the Statement of Applicability, and the clause cadence that keeps the certificate alive after year one. The impartiality rule means we take one side of the line per client: implementation, or the internal audit and readiness work, never both for the same ISMS. Where the certificate is one framework among several, the recurring layer usually belongs inside compliance as a service, whose own pricing is published in what outsourced compliance costs.

How to decide this week

Ask two prospects whether an ISO 27001 certificate would change their procurement answer; that conversation decides more than any cost model. If the answer is yes, run the planner against your real headcount and maturity for a first-pass number, then get two or three accredited certification bodies to state their derived audit days and day rates, which converts the audit-fee line from our band into your arithmetic. Then look hard at the remediation line, because your starting posture, not the standard, is what will set it: a scoped gap analysis is how that guess becomes a plan.

Frequently asked questions

How much does ISO 27001 certification cost for a small company?

Below our published bands, which assume a 51 to 200 person company. The budget planner scales the same four lines down for companies of 50 or fewer and up for larger ones, because certification bodies derive audit days from personnel count and scope, and the gap and remediation work scale with the environment the ISMS covers. For a company under about 50 people, run the planner with your real inputs rather than discounting the mid-market bands by feel, and ask certification bodies for their derived audit days, which is the number their fee is actually built on.

What do ISO 27001 certification audit fees cover?

The accredited certification body performing the initial certification audit across its two stages: a documentation review followed by an assessment of whether the management system is implemented and effective. Our planning band for that line is $30,000 to $55,000 at the mid-market base. The fee is a function of the audit days the body derives from your scope and personnel count under ISO/IEC 27006-1, so the honest comparison across bodies is days first, day rate second, and a quote dramatically below the others usually means fewer days than the derivation supports.

What does ISO 27001 cost per year after certification?

Our planning band for ongoing maintenance is $20,000 to $40,000 a year at the mid-market base: surveillance audit support, the clause 9.2 internal audit programme, management review, risk reassessment and evidence upkeep. The certificate itself runs on a three-year cycle, surveillance audits in the intervening years and a recertification audit at the end of the cycle, so the recurring spend is a programme cost that peaks modestly in the recertification year rather than a flat audit fee.

Are these figures a quote?

No. They are the planning bands we use for a 51 to 200 person company, published so the article and the budget planner state the same numbers, and they move with scope, size, starting maturity and timeline. A real number for your company comes from two artifacts: a scoped gap analysis that prices the remediation line against your actual posture, and derived audit days from two or three accredited certification bodies, which price the audit line against your actual scope. Any quote offered without either is a band wearing a price tag, ours included.