Services ISO 27001 Internal Audit Services
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ISO 27001 Internal Audit Services

ISO 27001 requires every certified organisation to conduct internal audits of its Information Security Management System at planned intervals. RedSecLabs delivers these audits independently, in line with ISO 19011 audit principles, producing the evidence your certification body will expect at surveillance and re-certification visits.

Many organisations struggle to maintain the independence and competence of internal audits when run by their own teams, the auditor needs to be free of conflict of interest with the area audited. Outsourcing to RedSecLabs solves the independence requirement while bringing fresh perspective that often catches issues internal teams miss.

Our auditors are qualified lead auditors with deep ISMS experience across financial services, healthcare, technology and government supply chain sectors.

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ISO 19011
Audit methodology
Lead auditors
Senior practitioners
5-10 days
Typical audit duration
100%
Surveillance audit pass rate

What is the ISO 27001 internal audit requirement?

Clause 9.2 of ISO 27001:2022 mandates internal audits at planned intervals to evaluate whether the ISMS conforms to the standard's requirements and the organisation's own information security requirements, and whether it is effectively implemented and maintained. The audit programme must consider the importance of the processes concerned and the results of previous audits.

Internal audits are a primary input to the management review (clause 9.3) and a focus area for certification body surveillance audits. A weak internal audit programme is one of the most common reasons for major nonconformities at surveillance visits.

What our internal audits give you:

Mandatory ISO 27001 internal audit obligation fulfilled

Independent assurance for senior leadership

Early identification of nonconformities before certification audit

Evidence pack ready for the certification body

Continuous improvement findings, not just compliance ticks

Audit reports your management review can act on

Internal audits are not a tick-box exercise, they are the primary mechanism your ISMS uses to identify and fix problems before they become certification audit findings.

Why outsource ISO 27001 internal audits?

Most internal audit failures come from one of three causes: insufficient auditor independence (you cannot audit your own work), insufficient auditor competence (ISMS audit is a specialist skill), or insufficient coverage (auditing the easy areas while skipping the difficult ones).

Outsourcing to RedSecLabs solves all three: our auditors are by definition independent from your operations, qualified as lead auditors with extensive ISMS experience, and follow a comprehensive audit programme covering every clause and applicable Annex A control across your three-year certification cycle.

Without strong internal audit, organisations risk:

Major nonconformity at certification body surveillance audit

Suspended or withdrawn ISO 27001 certificate

Loss of customer trust and procurement eligibility

Undetected ISMS drift between certification audits

Wasted budget on an ISMS that doesn't produce evidence

Personal liability for management responsible for the ISMS

A well-run internal audit programme is the cheapest insurance against certification audit failure, and the best source of practical improvement insight for your ISMS.

Who needs internal audit services?

Any ISO 27001-certified organisation that lacks an in-house independent audit function, or whose existing audit programme has been flagged for improvement, should consider outsourcing:

SaaS and technology companies

Financial services firms

Healthcare providers

Defence supply chain

Managed service providers

Professional services

Pre-IPO companies

Multi-site organisations

Organisations preparing for first-time certification can also use our pre-certification audit service to identify gaps before their formal Stage 1 audit.

Our Internal Audit Methodology

An ISO 19011-aligned audit methodology, scoped to your ISMS and delivered with the rigour your certification body expects.

01

Audit Plan & Programme

We agree the audit scope, criteria, methods and timing, coordinated with your three-year audit programme so coverage compounds.

02

Document Review

We review ISMS policies, procedures, risk register, Statement of Applicability and previous audit reports before any onsite work.

03

Opening Meeting

Formal opening meeting with the management representative, confirming scope, criteria, and logistics.

04

Evidence Gathering

Interviews with control owners, observation of operations, sampling of records and configurations, all to ISO 19011 standards.

05

Finding Analysis

Findings categorised as nonconformity (major or minor), opportunity for improvement, or strength, with objective evidence for each.

06

Closing Meeting

Findings presented to management with clear root cause analysis and recommended corrective actions.

07

Audit Report

Formal report delivered within 10 business days, structured to integrate directly into your management review.

08

Corrective Action Tracking

Optional follow-up review confirming closure of findings before your next surveillance audit.

For organisations on a three-year audit cycle, we recommend at least one full internal audit per year, with focused interim audits on high-risk areas.

What you receive

Every internal audit engagement with RedSecLabs includes:

  • Documented audit plan and audit criteria
  • Opening and closing meeting minutes
  • Detailed audit report with finding evidence
  • Nonconformity classification and root cause analysis
  • Recommended corrective actions for each finding
  • Management review-ready summary
  • Corrective action tracking dashboard (optional)
  • Pre-surveillance audit briefing for your team

Industries We Serve

We deliver this service across these industries:

SaaS & Technology
Financial Services
Healthcare
Defence Supply Chain
Managed Services
Professional Services
Cross-Border Organisations
Pre-IPO Companies

Why RedSecLabs for ISO 27001 audits

Our audit findings are the kind certification bodies respect, well-evidenced, objectively rooted in the standard, and pragmatically prioritised. Clients often tell us their certification body specifically references the rigour of our internal audit reports during surveillance visits.

IRCA-qualified lead auditors only
ISO 19011-aligned methodology
Independence guaranteed by external delivery
Reports your certification body actively values
Three-year audit programme coordination
10-day report turnaround

Schedule Your ISO 27001 Internal Audit

Book a free 30-minute scoping call. Fixed-fee quote, ISO 19011-aligned delivery, audit-grade reports.

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Where to next

Related services and industry packages worth exploring.

ISO 27001 Certification

Full ISMS implementation and certification

Virtual CISO

Ongoing senior advisory between audits

SaaS & Technology package

Frequently Asked Questions

ISO 27001 requires audits at "planned intervals" but does not specify frequency. Most certification bodies expect at least one audit per year covering different parts of the ISMS, with the full scope covered across the three-year certification cycle. We typically recommend one comprehensive annual audit plus focused interim audits on high-risk areas.

Yes, provided your auditors are competent and independent from the area being audited. Many smaller organisations find this difficult: the IT manager auditing IT controls fails the independence requirement. Outsourcing solves this cleanly. For larger organisations, we often train and shadow internal audit teams as a hybrid model.

A full annual internal audit typically costs £4,000-£12,000 depending on ISMS scope, sites, and depth required. Focused topic audits (e.g. supplier management, incident response) are typically £2,000-£4,000. We provide a fixed-fee quote after a short scoping call.

Most engagements run 5-10 days of auditor effort from kick-off to final report: 2-3 days planning and document review, 2-4 days onsite or remote evidence gathering, 1 day analysis and reporting. The elapsed time is typically 3-4 weeks to fit around your team's availability.

Yes. For organisations approaching first-time ISO 27001 certification, a pre-certification audit identifies gaps before the formal Stage 1 audit by your certification body, much cheaper to fix issues at this stage than after a Stage 2 nonconformity. We deliver these to the same ISO 19011 standard.

Yes. We provide pre-audit briefing for your team, attend opening and closing meetings as observers if requested, and support response to any findings raised during Stage 1 or Stage 2. Our role is to maximise the chance of a clean certification audit.
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A 30-minute call covers realistic effort, timeline, and a fixed-scope quote. CREST-aligned methodology, UK-based testers.
What you receive

Every engagement includes

  • ✓ Scoping call. A 30-minute call to define scope, timeline, and authorisation boundaries.
  • ✓ Test plan. Written test plan covering targets, methodology, and rules of engagement.
  • ✓ Technical report. Detailed findings with reproduction steps, evidence, and remediation guidance.
  • ✓ Executive summary. Board-ready summary with risk ratings and business impact.
  • ✓ Audit-ready evidence. Findings letter formatted for auditors, customers, and supervisory authorities.
  • ✓ Retest letter. Free retest of remediated findings within agreed window. Confirmation letter included.
  • ✓ Remediation call. A call with our lead tester to walk through findings and remediation strategy.
How we deliver

Our process, end to end

  1. 1
    Scoping call & fixed-scope quote
    A 30-minute call. We define scope, targets, timeline. You get a fixed-scope quote within one working day.
  2. 2
    Test plan & authorisation
    Written test plan covering methodology, targets, and rules of engagement.
  3. 3
    CREST-aligned execution
    Senior tester runs the engagement. Critical findings flagged immediately during testing.
  4. 4
    Technical + executive report
    Detailed technical findings with reproduction steps. Board-ready executive summary.
  5. 5
    Remediation call & retest
    Walkthrough with our lead tester. Retest of remediated findings within the agreed window.
Engagement scope

What shapes the quote

Small scope
Focused scope, smaller surface. 5-7 working days.
Medium scope
Multi-role, several integrations. 8-12 working days.
Enterprise scope
Complex environment, compliance evidence. 12-25 working days.
Fixed-scope quote within 1 working day
No surprise invoices. We commit to a number before you commit to us.
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