FRAMEWORK · CLOUD PRIVACY
ISO 27018, PII Protection in Cloud Services
The international standard establishing privacy controls and guidance for protecting personally identifiable information in public cloud environments. Applicable to cloud service providers acting as data processors and cloud customers handling personal data in cloud deployments.
Goldline delivers ISO 27018 implementation for UK cloud service providers and SaaS vendors handling PII in cloud environments. ISO 27001 Senior Lead Implementer (PECB) credentialed delivery.
WHERE THIS FRAMEWORK FITS
Where this framework fits at Goldline
Goldline's active service lines are ISO 42001 (AI governance) and ISO 27001 (information security) implementation. ISO 27018 is not a service Goldline delivers as a standalone product.
ISO 27018 is an ISO 27001 extension covering personal data protection in public cloud services. Organisations approaching ISO 27018 typically implement ISO 27001 first, then layer the sector-specific extension. Goldline's ISO 27001 Sprint delivers the foundational management system on which ISO 27018 is built.
For active engagement, book a free 45 minute diagnostic and we will confirm whether the ISO 27001 Sprint (or, where AI governance is also in scope, the ISO 42001 Sprint) fits your specific circumstances.
Book the Free Diagnostic- Cyber Essentials Plus Certified
- JOSCAR Registered
- Companies House 10901798
What is ISO 27018?
ISO 27018:2019 establishes commonly accepted control objectives, controls, and guidelines for protecting personally identifiable information (PII) processed in public cloud environments. It applies to organisations acting as PII processors via cloud services and provides a structured framework that aligns with international privacy principles.
The standard addresses the specific position of the cloud service provider as a data processor under GDPR. Cloud providers handle PII on instruction from their customer (the data controller). ISO 27018 sets out the controls a cloud processor must implement to support the controller's accountability obligations and to demonstrate appropriate technical and organisational measures.
ISO 27018 is most commonly implemented as an extension to ISO 27001, alongside ISO 27017 for broader cloud security controls. Where a full Privacy Information Management System is required, ISO 27701 provides the broader management system layer that incorporates ISO 27018 controls within a unified PIMS.
What ISO 27018 covers
Consent and transparency
Ensuring lawful basis and transparency obligations are met when processing PII in cloud environments. Customer notice requirements, controller transparency, and clarity over sub-processing arrangements.
Purpose limitation
PII handled in the cloud is processed only for the purposes specified by the cloud service customer (the data controller). Secondary use restricted; controller instructions documented and respected.
Data minimisation and retention
PII collected and retained limited to what is necessary for the documented purpose. Retention schedules enforced. Secure deletion procedures established for PII at end of life.
Customer data handling procedures
Documented procedures for handling customer PII in the cloud environment including return, transfer, and deletion at contract termination. Evidence of customer-controlled access maintained.
Sub-processor management
Sub-processor due diligence, contractual obligations, and customer notification before engaging or changing sub-processors. Chain of accountability for PII protection maintained across the supply chain.
Disclosure to authorities
Procedures for handling law enforcement and government requests for customer PII. Customer notification (where legally permissible), documented response process, and minimisation of disclosed data.
Why UK organisations adopt ISO 27018
- Enterprise customer due diligence increasingly requires evidence of structured cloud PII protection beyond GDPR statements. ISO 27018 is the recognised cloud PII assurance standard.
- GDPR Article 28 imposes specific obligations on data processors. ISO 27018 provides the structured control framework that demonstrates processor accountability to controllers and to the Information Commission (formerly the Information Commissioner's Office, ICO).
- ISO 27018 is increasingly a procurement gate for cloud services supplied to UK enterprise, financial services, and public sector buyers handling personal data.
- For organisations already holding ISO 27001, ISO 27018 extension leverages existing ISMS governance infrastructure, compressing implementation effort.
- Cloud SaaS providers selling into UK and EU enterprise differentiate on demonstrable PII protection. ISO 27018 certification provides a credible, audit-grade signal.
ISO 27018 vs ISO 27701 vs GDPR
| ISO 27018 | ISO 27701 | GDPR | |
|---|---|---|---|
| Type | International standard (cloud PII) | International standard (PIMS) | EU and UK regulation |
| Scope | Public cloud processors handling PII | Controllers and processors of personal data | Processing of personal data of EU and UK data subjects |
| Certification | Accredited certification body, extension to ISO 27001 | Certification body; standalone standard since the 2025 edition | No certification; the Information Commission and EU DPA enforcement |
| Relationship | Cloud PII protection overlay on ISO 27001 | Broader PIMS spanning controllers and processors, on-premise and cloud | Legal obligation; ISO 27018 evidences Article 28 processor accountability |
METHODOLOGY
How Goldline delivers ISO 27018
Our approach to ISO 27018 cloud PII protection. Five phases from PII scope through certification support.
- 01
Phase 1
PII scope and cloud processor obligations
PII inventory across cloud services. Processor obligations documented for each cloud service in scope. Customer (controller) instructions reviewed. Existing ISO 27001 ISMS scope extended to include cloud PII controls.
- PII inventory
- Processor obligations map
- Scope extension
- 02
Phase 2
Gap analysis against ISO 27018 PII controls
Comprehensive gap analysis against ISO 27018 PII controls and ISO 27002 guidance as it applies to PII in cloud environments. Existing consent management, retention, deletion, and disclosure processes assessed.
- Gap analysis
- PII control assessment
- Remediation plan
- 03
Phase 3
PII protection controls and processor obligations
Consent, transparency, purpose limitation, and minimisation controls implemented. Sub-processor management framework established. Disclosure procedures documented. Customer data handling procedures operationalised across the cloud estate.
- PII controls operational
- Sub-processor framework
- Disclosure procedures
- 04
Phase 4
Privacy documentation and transparency measures
Privacy documentation compiled including customer notices, retention schedules, sub-processor lists, and response procedures. Transparency measures operationalised. Evidence package compiled to certification body submission standard.
- Privacy documentation
- Transparency measures
- Evidence pack
- 05
Phase 5
Ongoing monitoring and certification support
Internal review against ISO 27018 PII controls. Certification body engagement supported. Continuous monitoring of PII controls established. Annual surveillance audit preparation.
- CB submission
- Certification issued
- Continuous monitoring
Frequently asked
Discuss where this framework fits your programme
Whether your organisation is positioning a SaaS or cloud service for enterprise procurement, evidencing GDPR Article 28 processor accountability, or extending an existing ISMS into cloud PII protection, Goldline provides senior practitioner-led delivery calibrated to your cloud estate.