Mobile Home Inspection: A Guide for Home Inspectors

Short answer: A manufactured home is built in a factory on a permanent chassis to HUD's federal code, which applies to homes built on or after June 15, 1976. "Mobile home" is the everyday name, and it is also used for units built before that date. Modular homes are built to state and local codes instead. Inspect the HUD label and data plate, piers, tie-downs, the marriage line, the bottom board and the roof. FHA loans need a foundation certification from a licensed engineer or architect under HUD's Permanent Foundations Guide, which a home inspector does not sign.

Manufactured homes differ from site-built houses in ways that change your report. This guide covers the terms, the federal rules, what to look at underneath and on top, where your inspection stops, and how to price it. Facts are as of September 2026.

Manufactured vs mobile vs modular

Clients, agents and lenders use these words loosely. Your report should not.

The federal definition in 24 CFR 3280.2 is specific: a manufactured home is "a structure, transportable in one or more sections, which in the traveling mode is 8 body feet or more in width or 40 body feet or more in length or which when erected on-site is 320 or more square feet, and which is built on a permanent chassis and designed to be used as a dwelling with or without a permanent foundation when connected to the required utilities."

According to InterNACHI, Congress adopted the term "manufactured home" in 1980 for homes built to the HUD Code. That is why pre-1976 units are still called mobile homes in the trade.

One change to watch. On June 12, 2026, HUD published a proposed rule revising the definition of "manufactured home" so that upper-floor sections of multistory homes would not need a permanent chassis. Comments closed August 11, 2026. It is a proposal, not the rule, as of November 2026.

Identify the home first: HUD label and data plate

Before you inspect anything else, find out what you are looking at.

HUD certification label. HUD's handbook describes it as "a two inch by four inch aluminum plate permanently attached" to the home, located "at one end of each section of the house, approximately one foot up from the floor and one foot in from the road side." A double-wide has two. HUD says every transportable section built after June 15, 1976 must carry one.

Data plate. A paper document inside the home, usually next to the electrical panel, in the utility room or in a kitchen cabinet. It lists the manufacturer, serial number, model, date of manufacture, and the wind, roof load and thermal zone maps the home was built for.

Photograph both and record the label numbers in your report. They answer three questions a lender or insurer may ask:

1. Was it built to the HUD Code?
2. When and by whom?
3. Was it built for this location's wind, roof load and thermal zone? HUD's homeowner guidance says a home "should never be placed in a more restrictive wind, thermal, or roof load zone than that for which it was built."

If the label is missing, say so. For FHA loans, the lender must then obtain label verification from the Institute for Building Technology and Safety (IBTS). That is the lender's task, not yours, but your note starts it.

Foundation certification for FHA and VA loans

The certification is an engineering document, and clients and agents sometimes expect it from the home inspector. A home inspection is not a substitute for it.

FHA

HUD Handbook 4000.1 (last revised August 12, 2026) sets the rules. To be eligible, a manufactured home must, among other things:

• have at least 400 square feet of floor area;
• carry the HUD label, or a label verification letter, showing it was built on or after June 15, 1976;
• be classified as real estate;
• be built on and remain on a permanent chassis;
• sit on a permanent foundation built to the Permanent Foundations Guide for Manufactured Housing (PFGMH, HUD handbook 4930.3G);
• have been moved directly from the manufacturer or dealer to the site.

For the foundation, the lender "must obtain a certification by an engineer or architect, who is licensed/registered in the state where the Manufactured Home is located, attesting to compliance with the PFGMH." A certification from a previous FHA loan can be reused if there are no alterations or observable damage to the foundation since then. If there are additions or alterations the certification did not cover, the lender needs an inspection by the state manufactured housing agency, or a structural engineer's certification if the state has no inspectors.

The FHA appraiser also checks that the towing hitch and running gear are removed and that the perimeter enclosure is continuous and secured.

A draft FHA rewrite, not in effect. On September 22, 2026, FHA posted a draft rewrite of its Minimum Property Requirements for feedback through November 6, 2026. FHA says the draft is not official policy and cannot be used on any FHA-insured mortgage until finalized, and that existing policies remain in effect until amended. As of November 11, 2026, FHA's Drafting Table lists it as not yet published. HUD's summary of the draft says it would replace the PFGMH with HUD's model manufactured housing installation standard, replace the required PFGMH engineer certification with a Certification of Structural Modifications, revise the skirting requirement to adopt the HUD model installation standards, and remove the separate perimeter enclosure section. Until FHA publishes a final update, the rules above apply.

VA

VA's appraisal chapter (VA Pamphlet 26-7, Chapter 12, Topic 40) requires that the home and site be real estate under state law, that the home sit on "a permanent foundation, constructed to withstand both supporting loads and wind-overturning loads, that meets state and local requirements," that it be built to the HUD standards, and that it have at least 400 square feet for a single-wide or 700 square feet for a double-wide. The chapter does not itself name an engineer's certification. Whether one is required for a VA file is the lender's call.

Where you fit. Unless you are a licensed engineer or architect, do not certify a foundation, and do not let your report read like a certification. Report what you observed, and if the client needs financing, tell them the lender may require a separate foundation certification. Keep a licensed engineer you can refer. For how the appraisal differs from your inspection, see FHA home inspection criteria.

What to look at on a manufactured home

Most of your usual inspection applies. These are the areas that are different, with the federal installation standards (24 CFR Part 3285) as a reference point. Installation standards tell you what the installer was supposed to do; the manufacturer's installation instructions for that home control the details.

The marriage line

On a multi-section home, the marriage line is where the halves meet. Federal installation rules require structural interconnection along the mate line and allow no gaps between the structural elements once the exterior close-up is complete. The manufacturer must supply a mate-line gasket to resist the entry of "air, water, water vapor, insects, and rodents."

Look for it inside and out. Inside, cracks and stains along the ceiling ridge and at the end walls. Outside, gaps in the trim or roof cap. Underneath, where you can see it, the gap between the floor sections.

The bottom board

The bottom board (belly board or belly wrap) seals the underside of the floor and holds the insulation, plumbing and often the ducts. Federal rules require installers to reseal tears and replace missing insulation. Tears, sagging and wet insulation are worth tracing, because they can point to a plumbing leak or a disconnected duct above them.

Tie-downs and piers

These keep the home on the ground in wind. You are not calculating anchor loads. You are looking for what is missing, loose, rusted or damaged, and saying so. If the data plate shows a wind zone, record it. In Florida, Citizens requires a four-point inspection for mobile home applications on properties more than 20 years old; see the 4-point inspection guide.

Limitations and scope

Write these into your agreement and report, because skirting and the bottom board conceal much of the underside.

• Crawl space access. The federal minimum is 12 inches under the main frame. Your standards of practice may not require you to enter a space that tight. State what you could see and from where.
• Concealed systems. The bottom board hides plumbing, ducts and insulation. You cannot inspect what you cannot see without cutting it open, and you should not cut it.
• Not a foundation certification. Say plainly that the inspection does not certify the foundation to the PFGMH or any other standard.
• Not a HUD Code compliance review. You are reporting condition, not verifying the factory built it to 24 CFR 3280.
• Pests. Skirting hides the underside of the home. Report visible wood damage and refer it; see WDO vs WDI inspections.

Check your state's rules too. Florida, for example, includes a "manufactured or modular home" in its statutory definition of a home for home inspection purposes (section 468.8311, F.S.), so the full home inspection scope applies.

For wording that holds up when a client disputes a limitation, see how to write defect comments that hold up and home inspection agreements.

How to price a mobile home inspection

There is no official price, and square footage alone is a poor guide. Time under the home, not floor area, usually decides how long the job takes.

Price on the things that drive time and risk:

Then check the result against your normal fee. Our guide on how much a home inspector should charge covers the method, and pricing ancillary inspection services covers add-ons like WDI coordination.

Build a manufactured home template

A site-built template misses half of this. Binsr templates are fully configurable, with your own sections, line items and findings, so you can build a manufactured home template with sections for the HUD label and data plate, piers and anchoring, the marriage line, the bottom board and crossovers. Findings can carry photos at the line-item or finding level, which is useful for label numbers and data plate zone maps. The comment library holds 12,000+ comments and templates written by inspectors, which you can adapt to manufactured home findings. See features, or start with our free home inspection templates.

Frequently asked questions

Keep reading

• FHA home inspection criteria
• How much should a home inspector charge
• How to price ancillary inspection services
• The 4-point inspection
• WDO vs WDI inspections for home inspectors
• Free home inspection templates

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