One of the biggest drivers of CMMC certification cost, timeline, and complexity is scope. Contractors that fail to properly scope their environment often discover too late that they have made compliance far more difficult—and expensive—than necessary. 

Understanding CMMC scoping and how to use a CMMC enclave correctly can significantly reduce assessment risk while keeping your organization eligible for DoD contracts. 

CMMC scoping is the process of identifying which systems, people, processes, and environments are subject to CMMC requirements. 

Scope is determined by: 

• Whether you handle Federal Contract Information (FCI) or Controlled Unclassified Information (CUI) 

• Where that data is stored, processed, or transmitted 

• Which users and systems can access that data 

Only systems in scope must meet CMMC controls. Improper scoping is one of the most common causes of failed assessments. 

During a CMMC assessment or audit, assessors validate that: 

• All in-scope systems meet applicable controls 

• Out-of-scope systems are properly isolated 

• Documentation accurately reflects the environment 

If scope is unclear or overly broad, organizations may: 

• Be assessed against unnecessary controls 

• Expand Level 2 requirements unintentionally 

• Increase remediation costs 

• Delay certification 

Proper scoping allows organizations to align security efforts with actual contractual requirements. 

A CMMC enclave is a segmented environment specifically designed to contain FCI or CUI while isolating the rest of the organization from CMMC requirements. 

Instead of securing the entire enterprise, contractors can: 

• Limit CMMC controls to a defined system boundary 

• Reduce the number of users and assets in scope 

• Simplify documentation and ongoing compliance 

Enclaves are especially common for organizations pursuing CMMC Level 2 certification aligned with NIST SP 800-171. 

CMMC enclaves can take different forms depending on operational needs: 

• IT Enclaves: Dedicated systems or networks handling CUI 

• Cloud Enclaves: Isolated cloud environments with controlled access 

• Hybrid Enclaves: Combination of on-premise and cloud systems 

• Third-Party Enclaves: Managed by an MSP supporting CMMC compliance 

Each approach must still meet applicable CMMC controls and documentation requirements. 

CMMC Level 1 Scoping 

• Applies to FCI only 

• Typically allows broader system use 

• Annual CMMC Level 1 self-assessment 

• Minimal documentation requirements 

CMMC Level 2 Scoping 

• Applies to CUI 

• Requires strict boundary definition 

• Often involves CMMC enclaves 

• Requires extensive documentation aligned with NIST 800-171 controls list 

• Usually requires a third-party assessment organization (C3PAO) 

Misidentifying CUI is one of the most common scoping errors contractors make. 

Using an enclave can dramatically lower: 

• Number of systems in scope 

• Number of users subject to controls 

• Volume of required documentation 

• Remediation effort 

• Long-term compliance maintenance 

Because CMMC certification cost is directly tied to scope, proper enclave design can be the difference between a manageable assessment and an overwhelming one. 

Even with an enclave, organizations must maintain: 

• Accurate CMMC documentation 

• System Security Plans (SSPs) 

• Policies and procedures 

• Plans of Action and Milestones (POAMs) for unmet controls 

Enclaves reduce scope—but they do not eliminate compliance responsibilities

Contractors often struggle with: 

• Allowing CUI to exist outside the enclave 

• Over-scoping user access 

• Poorly defined system boundaries 

• Inaccurate documentation 

• Relying on assumptions instead of evidence 

These mistakes frequently surface during a CMMC audit or assessor review and can delay certification. 

Scoping should be addressed before: 

• A formal CMMC assessment 

• Engaging a C3PAO 

• Finalizing certification timelines 

• Responding to solicitations with CMMC FAR clauses 

Early scoping decisions directly impact success. 

Starting With a CMMC Checkup 

The most effective way to validate scoping and enclave decisions is through a CMMC checkup or self-assessment. 

Using structured questionnaires and guided workflows, organizations can: 

• Identify where FCI and CUI exist 

• Define system boundaries accurately 

• Evaluate enclave feasibility 

• Auto-generate documentation and POAMs 

• Estimate time and cost before certification 

This creates clarity and supports productive conversations about next steps without unnecessary commitment. 

Scope Control Is Compliance Control 

CMMC compliance is not just about security controls—it is about control of scope. Contractors that invest time in proper scoping and enclave design gain flexibility, reduce cost, and improve assessment outcomes. 

Understanding what truly needs to be secured is the foundation of a successful CMMC program.