Stacking SOC 2 + ISO 27001 — How Much You Save

The most common question we get from companies that already have SOC 2: "How much more does ISO 27001 cost?" The answer is less than you think — and the same applies in reverse.

Why Stacking Is Cheap

SOC 2 and ISO 27001 share about 80% of their control requirements:

• Risk assessment — both require a formal, documented risk assessment. You do it once.
• Access control — SOC 2 CC6.x and ISO 27001 A.5.15–A.5.18 cover the same ground.
• Change management — SOC 2 CC8.1 and ISO 27001 A.8.32 are the same process.
• Incident response — SOC 2 CC7.3–CC7.5 and ISO 27001 A.5.24–A.5.28 share the same runbook.
• Encryption — SOC 2 CC6.1/CC6.7 and ISO 27001 A.8.24 reference the same technical controls.
• Vendor management — SOC 2 CC9.2 and ISO 27001 A.5.19–A.5.22 use the same vendor register.

When we build your SOC 2 program, all of this evidence, these policies, and these processes already exist. Adding ISO 27001 means:

1. Gap analysis — we identify the ~20% of ISO 27001 that SOC 2 doesn't cover (mostly ISMS governance: management review meetings, internal audit program, Statement of Applicability).
2. Fill the gaps — we draft the additional documents, set up the governance cadence, and map existing evidence to ISO 27001 Annex A controls.
3. Engage a certification body — ISO 27001 requires an accredited certifier (not just any CPA firm). We introduce you to our network.

The Numbers

SOC 2 First, Then Add ISO 27001

| Component | SOC 2 Standalone | Adding ISO 27001 | |-----------|-----------------|------------------| | FencePencil setup | $15,000 | $5,000–$10,000 | | Monthly retainer | $2,500/mo | +$1,000/mo | | Auditor / Certifier | $20K–$40K (SOC 2 auditor) | $15K–$30K (ISO cert body) | | Year 1 total | $65K–$85K | +$27K–$52K |

Compare that to doing ISO 27001 from scratch ($85K–$120K). You save $30K–$70K by stacking.

ISO 27001 First, Then Add SOC 2

| Component | ISO 27001 Standalone | Adding SOC 2 | |-----------|---------------------|--------------| | FencePencil setup | $20,000 | $5,000 | | Monthly retainer | $3,500/mo | +$0 (covered) | | Auditor | $15K–$30K (ISO cert body) | $15K–$30K (SOC 2 auditor) | | Year 1 total | $77K–$92K | +$20K–$35K |

Same principle — the second framework leverages everything from the first.

Adding a Third Framework

The savings compound. Once you have SOC 2 + ISO 27001, adding HIPAA or PCI DSS typically costs:

• HIPAA: +$5K setup, +$0–$1K/mo retainer increment, no auditor (HIPAA has no formal audit)
• PCI DSS: +$5K–$10K setup, +$500–$1K/mo, $5K–$15K for a QSA if needed

By your third framework, you're mostly just mapping existing controls to a new standard and filling small gaps.

The Bottom Line

Don't build compliance programs in isolation. If you know you'll need multiple frameworks, plan for it from day one. The control foundation is the expensive part — each additional framework is just mapping and gap-filling.

Use our compliance cost calculator to model multi-framework scenarios, or reach out to talk through your roadmap.