What Is PFGMH? The HUD Guide Behind Every Manufactured Home Foundation Certification

Somewhere in the last week, a loan officer or an underwriter sent you a sentence with the letters PFGMH in it. Probably with no explanation. Probably attached to a deadline.

Here’s the short version: PFGMH stands for the Permanent Foundations Guide for Manufactured Housing. It’s a guidebook published by the U.S. Department of Housing and Urban Development, and it’s the standard your lender is measuring your home’s foundation against before they’ll fund the loan.

The longer version is more useful, because most of what’s written about this guide online is wrong, and a few of those wrong things cost homeowners real money.

What the PFGMH Actually Is

It’s a book. A federal design guidebook for foundations under manufactured homes, published by HUD in September 1996. It travels under two numbers, and both point at the same September 1996 book: HUD-7584, the publication number FHA guidance to lenders quotes, and 4930.3G, the handbook number HUD files it under on HUD CLIPS. HUD’s own documents use each of them, so a lender asking for one and an engineer citing the other are talking about the same guide. The September 1996 edition revised the August 1989 edition of HUD Handbook 4930.3G, and it is still the current edition.

You can read the whole thing yourself. HUD hosts it on HUD CLIPS, and the complete guide is available as a free PDF from HUD USER. It’s long, it’s technical, and it was written for engineers and foundation designers, not for homeowners. That’s not an accident, and it matters for what comes next.

The Most Important Thing About It: It’s a Design Guide, Not an Inspection Checklist

This is the part almost every article on the subject gets backwards.

The PFGMH was written to tell someone how to build a permanent foundation under a manufactured home. It covers the load conditions a foundation has to handle, the criteria a foundation system has to satisfy, and it includes pre-engineered foundation designs a builder can construct from directly, along with the worksheets to document it.

It was not written as a checklist for grading a foundation that’s already sitting there holding up a house.

That distinction is the whole reason this process works the way it does. When your home was set twenty years ago, nobody built it from a page in this book. So the question in front of your lender isn’t “did you follow the recipe.” It’s “does what you have satisfy the criteria.” Answering that question takes engineering judgment, run against the actual home, on the actual site.

Which brings up the part that saves people money.

The Guide Gives You Two Ways to Comply

Path one: build the foundation to one of the pre-engineered designs printed in the guide, and hand the documentation to the lender.

Path two: have a licensed professional engineer evaluate the foundation and certify that it meets the standard.

The guide permits both. That’s not a loophole or a workaround, it’s written into how the document is structured. And in practice, almost everyone takes path two.

Here’s why. The pre-engineered designs in that book are conservative by nature, because they have to work for any home on any site anywhere in the country. Building to them usually means installing a lot more foundation than a specific home on a specific lot in North Carolina actually needs. We’ve seen that difference run to several thousand dollars of additional foundation work. Our fee to inspect the home and issue the certification is a flat $500.

So the book that was written to let you skip hiring an engineer is, in most real transactions, the reason you hire one. It’s cheaper. It is what it is.

There’s a second reason, and it’s the practical one: your lender can’t read this book. Underwriters aren’t structural engineers, and they’re not going to sign off on a stack of load worksheets. What they can do is accept a signed and sealed letter from a licensed engineer. That’s a document they know how to file.

What a “PFGMH Inspection” Actually Involves

When a lender asks for a PFGMH inspection, a PFGMH certification, or PFGMH compliance, they’re all pointing at the same deliverable: an engineer’s letter that either certifies the foundation meets the standard or specifies exactly what doesn’t.

On a typical North Carolina job, that means a licensed PE looking at how the home transfers its weight into the ground and how it’s held down against wind and uplift. Piers, footings, the anchoring system, the condition of what’s there, the site itself. Then it’s arithmetic against the criteria in the guide.

We do hundreds of these a year across North Carolina. If a home doesn’t pass, it’s for a real structural or safety reason — not for a missing item on somebody’s checklist.

If a home does need work, the letter says what. Nothing vague, nothing padded.

What the PFGMH Does Not Say

This is where the misinformation lives, and where it gets expensive.

It does not publish a list of “approved” foundation types. You’ve probably seen a chart online, maybe one with a nice green checkmark next to “slab” and “basement” and a red X next to “pier and beam.” Some of those charts even list “HUD Title II” as a foundation type, which isn’t a foundation type at all. Those charts are wrong. Not oversimplified. Wrong.

Pier and beam can absolutely be a permanent foundation. It’s the standard system across North Carolina. In six years of doing this work statewide, we could count on one hand the foundations we’ve certified that weren’t pier and beam. If pier and beam disqualified a home, this business wouldn’t exist.

It doesn’t require brick skirting. On something like 99.99% of North Carolina manufactured homes, the perimeter skirting isn’t carrying any load at all. It’s there to keep water and animals out from under the house. Vinyl or brick is a decision about appearance and budget. People choose brick because they like how it looks.

It doesn’t require one specific anchoring method. Straps and anchors work. So does a steel tube bracing system. So does a properly reinforced perimeter foundation. There’s more than one correct answer, and which one is right depends on the home and the site.

Here’s the line worth remembering: if someone tells you your foundation isn’t permanent until you install a specific list of items, and that person isn’t a licensed engineer, be very skeptical. We get calls from realtors asking whether we require brick all the way around or a particular product on every pier, because they’ve been burned by someone who did. We don’t require any particular item. We require that the home is structurally sound.

Some of that bad advice is honest and just old, recycled from an engineer’s report written a decade ago. Some of it isn’t. Either way, homeowners have spent thousands of dollars on work that was never required.

How This Plays Out in North Carolina

Most of what makes foundations different from state to state is buried underground where you can’t see it. Footing depth is the big one — it varies with local frost conditions, and in parts of the Northeast footings run several feet down. That changes how deep the concrete goes and not much else you’d notice from the driveway.

So a home in Haywood County and a home in Wake County can look nearly identical from the road and still need different things below grade. Slope, soil, and drainage vary enormously across this state. That’s exactly the kind of judgment the guide’s pre-engineered designs can’t make for you, and an engineer standing in your crawl space can.

What This Means for Your Closing

If your lender said PFGMH, what they need is an engineer’s letter. Not a home inspection, not a contractor’s opinion, not a repair estimate.

Getting one is straightforward. We quote 2 to 4 business days. The fee is a flat $500 statewide, and that includes the additions inspection most loans also require. You don’t need to know anything about your foundation to get started, and you don’t need to have read a word of the HUD guide. You need the address.

Call us and you’ll get a real person. If the home is fine, and it usually is, you’ll have the letter in hand and your file moves.

Frequently Asked Questions