CMMC Compliance: DIY vs Hiring a Consultant

Fair question. Especially when you see what consultants charge. If you're a small manufacturer with 30 or 50 people, you're watching every dollar. The last thing you want is to spend $50K on a consultant telling you things you could have figured out yourself.

So let's be honest about both paths. There are situations where DIY can work, and there are situations where it'll cost you more in the long run than just hiring someone. The answer depends on where you're starting from, what kind of internal resources you have, and how fast you need to get certified.

We're not going to tell you that DIY is always a bad idea. That's not true, and anyone who says it is trying to sell you something. There are real scenarios where handling CMMC compliance internally makes sense.

CMMC Level 1

If you only need Level 1, you can probably do this yourself. It's a self-assessment against 17 basic cybersecurity practices -- things like using antivirus, requiring passwords, and limiting physical access. No CUI involved. A competent IT person can work through this without outside help. If Level 1 is all your contracts require, save your money.

CMMC Level 2 with Strong Internal IT

If you have a dedicated, experienced IT security person -- someone who genuinely understands network security, not just the person who fixes the printer and resets passwords -- and you're willing to commit that person for 6 to 12 months almost exclusively to CMMC work, DIY Level 2 is possible. Not easy. But possible.

This works best when your CUI scope is small and well-defined. If you only handle controlled information in one department or on a handful of systems, the boundary is manageable. The fewer systems in scope, the fewer controls you have to implement and document.

The Honest Caveat

Even in the "DIY works" scenario, most companies still end up hiring a consultant for the System Security Plan and documentation. The SSP is the single most important document in your assessment, and writing one that actually satisfies a C3PAO assessor is a specific skill. Plenty of technically competent IT people can implement controls but struggle to document them in the way an assessor expects to see them.

Here's where we have to be straight with you. For the majority of small defense manufacturers we talk to, DIY is a bad bet. Not because you're not smart enough -- you are. But because the math doesn't work out. Here's what we see over and over again:

• No dedicated IT security staff. Your IT person is already at 110% capacity just keeping email running, machines online, and users happy. Asking them to also become a CMMC expert on top of their existing job isn't realistic.
• Starting from near-zero on 110 controls. If you don't have formal cybersecurity policies, documented procedures, or a security program in place, you're not tweaking a few things. You're building from the ground up. That's a different kind of project entirely.
• Need to be assessment-ready within 12 months. If contracts are on the line and you need certification soon, DIY timelines of 12 to 18 months won't cut it.
• You handle ITAR-controlled technical data. ITAR adds a layer of complexity around how data is stored, transmitted, and accessed. Getting this wrong isn't just a failed assessment -- it's a potential regulatory violation.
• You're on commercial Microsoft 365 and need GCC High. Migrating from standard Microsoft 365 to GCC High is a full technical project, not a checklist item. It involves tenant migration, data transfer, reconfiguration, and testing. This alone trips up most DIY efforts.
• You don't have existing policies, procedures, or an SSP. Starting from a blank page on documentation is one of the most time-consuming parts of CMMC compliance, and it's where the most costly mistakes happen.
• Your SPRS score is below 50 -- or you don't have one. If your current self-assessment score is low, you have a significant amount of remediation ahead. If you haven't even calculated a score yet, that tells you where you stand.

If three or more of these apply to you, DIY is going to cost you more than hiring help. Not because the consulting fees are low -- they're not. But because the alternative is worse.

The sticker price of a consultant is easy to see. What's harder to see is what DIY actually costs when you add it all up.

Your IT Person's Time Has a Real Cost

If your IT person spends 6 to 12 months focused on CMMC, what isn't getting done? That server upgrade you've been putting off. The new ERP rollout. Day-to-day support for your team. Help desk tickets piling up. Their salary doesn't go away while they're learning NIST 800-171 controls from scratch. That's a real cost, even if it doesn't show up on a consulting invoice.

Mistakes Are Expensive to Fix

An improperly scoped environment means you redo work. If you put too many systems in scope because you didn't know how to build an enclave, you're implementing and documenting controls on systems that didn't need to be included. A bad SSP means the assessor finds gaps you thought were closed. Every mistake costs time, and time is the one thing you can't buy back.

A Failed Assessment Is the Most Expensive Outcome

Your C3PAO assessment will cost somewhere between $30K and $100K. If you fail because your preparation was incomplete -- because your SSP had gaps, your evidence was weak, or your controls weren't properly implemented -- you don't get a refund. You go back, fix the problems, and pay for a reassessment. That's the single biggest financial risk of DIY, and it's the one most people underestimate.

Time Is Money. Literally.

Every month you're not certified is a month you can't bid on contracts that require CMMC. Your competitor who hired a consultant got certified 6 months faster. That's 6 months of contracts they won and you couldn't compete for. When you look at it that way, a consulting investment that saves you 6 to 10 months pays for itself with a single contract win.

This isn't a sales pitch. These are the specific things that are genuinely difficult to replicate without someone who's been through the process multiple times.

• Knows exactly what assessors look for. A consultant who's been through multiple C3PAO assessments knows the difference between a control that's technically implemented and one that an assessor will actually accept. Those are not always the same thing. The way you document evidence, the way you word your SSP, the artifacts you keep -- this is learned through experience, not reading the NIST standard.
• Builds your SSP to assessment-grade quality the first time. The System Security Plan is the backbone of your assessment. A good consultant writes SSPs that assessors can follow without asking a hundred clarifying questions. A DIY SSP often leaves gaps that look fine to the person who wrote it but fall apart under assessment scrutiny.
• Identifies scope reduction opportunities you'd miss. One of the biggest cost drivers in CMMC is scope -- how many systems, users, and locations are included. A consultant knows how to architect enclaves that reduce your scope, which directly reduces your implementation cost and assessment cost. Most companies doing DIY over-scope because they don't know the boundaries are negotiable.
• Handles GCC High migration without disrupting operations. Moving from commercial Microsoft 365 to GCC High is a project that can easily go sideways. A consultant who's done it before knows the gotchas -- licensing changes, data migration sequences, configuration differences -- and can get you there without your team missing a beat.
• Creates policies and procedures that actually work. Nobody wants a 500-page policy document that sits on a shelf. A good consultant writes policies that satisfy the controls while being short enough that your people will actually read and follow them. That's a balance that takes practice to get right.

If you decide that working with a consultant is the right call, we've written about our approach on our CMMC consulting for small manufacturers page.

Here's what a lot of companies actually do, and it's often the smartest play if you have some internal IT capability but not enough for a full DIY effort.

You hire a consultant for the parts that require specialized CMMC experience:

• A gap assessment to figure out exactly where you stand and what needs to change
• The System Security Plan and supporting documentation, written to assessment-grade quality
• GCC High migration and enclave architecture, if applicable
• A detailed remediation roadmap with priorities, timelines, and specific instructions

Then your internal team handles the remediation -- the actual work of implementing controls, configuring systems, and rolling out policies -- using the roadmap the consultant built. You stay involved, your IT person learns the environment, and you save money by doing the labor-intensive parts in-house.

This hybrid approach gives you the expertise where it matters most (scoping, documentation, and strategy) without paying consultant rates for tasks your team can handle with clear instructions. It typically costs 30 to 50 percent less than a fully managed engagement while still dramatically reducing your risk of assessment failure.