For a manufactured home to qualify as real property — eligible for FHA Title II, conventional, VA, or USDA financing — the foundation must meet HUD's Permanent Foundations Guide for Manufactured Housing (PFGMH). Not all "concrete underneath" foundations qualify. Pier & beam alone usually doesn't. This page covers the four foundation types you'll encounter, what an engineer actually checks during certification, and which loan programs accept which foundation type.
What brings you here today?
Manufactured homes can sit on several foundation types. Only two of them — full perimeter foundation and basement — reliably meet HUD's PFGMH "permanent" standard for real-property financing. Pier & beam and slab can sometimes qualify with engineering modifications, but the default versions usually don't.
Continuous concrete or masonry wall around the entire footprint. The default PFGMH-compliant foundation.
The default real-property foundation. Provides full anchoring, frost-line protection, and crawl-space access.
Full basement under the home — concrete or masonry walls, often finished space below.
Adds livable square footage. More expensive but increases home value substantially. Common in colder climates where deep frost lines justify the depth.
Concrete piers spaced under the chassis with skirting around the perimeter. Most common in older installations.
The most common foundation on existing manufactured homes. Often the foundation that needs upgrading before real-property conversion.
Concrete slab poured directly under the home with chassis tied down. Sometimes encountered in warmer climates.
Slab-on-grade alone rarely qualifies. An engineer can sometimes design a stem-wall addition to bring it into compliance — case-by-case.
When you order a foundation certification for FHA/conventional financing, a licensed structural engineer evaluates these six dimensions. The certification ($350–$850 typical) is a written letter stating compliance — required for closing on real-property manufactured loans.
Footings must extend below the local frost depth (typically 12–48 inches depending on climate zone). Pier footings must be sized to support load — often 16"×16" or larger concrete pads.
Home must be permanently anchored to foundation — typically through galvanized steel straps from chassis frame to anchor bolts cast into footings or perimeter wall. Wind-zone-specific spacing requirements apply.
Perimeter must be enclosed by a continuous wall of concrete, masonry, or treated wood designed to support the home — not just decorative skirting. Vinyl skirting alone does not meet PFGMH.
Towing hitches, wheels, and axles must be permanently removed. The home cannot be transportable. Failure to remove these is a common reason for failed certification on otherwise compliant foundations.
Grade must slope away from foundation. Crawl space (if any) must have proper ventilation per local code. Standing water under the home is a frequent compliance issue requiring grading work.
All utilities (electric, water, sewer, gas) must be permanently connected — no temporary or above-ground service runs. Service entrance must be code-compliant for the jurisdiction.
The full PFGMH document is published by HUD and runs ~250 pages; engineers reference it during certification. The checklist above covers the most commonly-flagged compliance items. Your specific situation may have additional requirements based on state code, soil conditions, wind zone, or seismic zone.
A quick-reference matrix. Eligibility shown is general guidance; specific loan approval depends on engineer certification, lender overlays, and state requirements.
| Foundation Type | FHA Title I | FHA Title II | Conventional | VA | USDA |
|---|---|---|---|---|---|
| Full perimeter | ✓ | ✓ | ✓ | ✓ | ✓ |
| Basement | ✓ | ✓ | ✓ | ✓ | ✓ |
| Pier & beam | ✓ | No | No | No | No |
| Slab only | ✓ | Engineer | Engineer | No | Engineer |
| Pier + skirting (existing) | ✓ | No | No | No | No |
"Engineer" means: requires a structural engineer's certification that the foundation can be brought into compliance through specific modifications. Often eligible after upgrade work. If your foundation is in the "Engineer" or "No" column for your preferred loan, talk to LHFS about upgrade-and-refi paths — the math often works.
If your existing foundation doesn't meet PFGMH and you want real-property financing, here's what conversion typically costs. Total upgrade cost: usually $8,000–$25,000 depending on existing conditions, state requirements, and engineering scope. The break-even from chattel→real refi savings often hits within 18–24 months.
Licensed structural engineer evaluates the existing foundation, designs any required modifications, issues compliance letter at completion. Required for FHA Title II / conventional / VA loans.
Concrete or masonry perimeter wall around home footprint. Cost varies by home size (typically 14–28 feet wide × 60–80 feet long for double-wide) and local labor rates.
Permanent removal of transport hardware. Some installers include this in the original delivery; others charge separately. Required for PFGMH compliance.
Additional anchor bolts tying chassis to perimeter wall or footings, sized per wind/seismic zone. Often combined with perimeter wall work.
Grading work to slope grade away from foundation, sometimes adding gutters, French drains, or vapor barriers. Highly site-specific.
Affidavit of Affixation filing at county recorder, vehicle/MH title surrender at DMV, and state-specific real-property recording fees. State-by-state variance is wide.
Eight questions about HUD-compliant manufactured home foundations. Real answers, including retrofit costs and what an engineer's letter actually covers.
An engineered foundation system that meets HUD's Permanent Foundations Guide for Manufactured Housing (PFGMH) standards. Designed to permanently anchor the home with structural integrity meeting current building codes.
Two main types: perimeter foundations (full concrete or block walls around home perimeter) and pier-and-beam systems (engineered piers with anchoring straps). Both can comply if properly designed.
Concrete footings below frost line for your region. Reinforced piers or perimeter walls rated for home weight plus snow/wind/seismic loads. Anchoring system connecting home to foundation. Skirting or perimeter enclosure meeting fire and access codes.
Specifics vary by climate zone and seismic region. Foundations in California earthquake zones, Florida wind zones, or Northern frost zones have additional requirements.
Licensed structural or civil engineer, or HUD-approved foundation inspector, depending on jurisdiction. They verify the installed foundation matches engineered plans and meets HUD PFGMH standards.
Certification is documented in a written report (sometimes called Engineer's Foundation Certification Letter) submitted to the lender at refinance or new financing. Required for FHA Title II, Conventional, and VA financing.
Typical range: $5,000–$20,000 depending on home size, site conditions, climate zone, and foundation type. Single-wide on flat lot in mild climate: low end. Double-wide on sloped lot in cold/seismic zone: high end.
Cost-saver: have foundation installed at the same time as home placement during initial setup, rather than retrofitting later. Retrofits add 30–50% to base cost due to lifting and reseating the home.
Yes, though more complex and costly than initial installation. Process: lift home, remove existing piers/supports, install new foundation per engineered plans, reset home, anchor properly, certify.
Often justified by financial benefit: chattel-to-real-property conversion typically pays back retrofit cost in 3–5 years via lower mortgage rate. Run the numbers before deciding.
Common situation, especially with older manufactured homes. Many homes set in 1980s–1990s used piers without code-compliant anchoring. These don't qualify as HUD permanent foundation today.
Remediation: structural engineer evaluates existing setup, recommends upgrade path. Usually involves adding anchoring straps, strengthening piers, ensuring footings are below frost line, and certifying the upgraded system.
The foundation itself can be hidden behind skirting, but the engineered components must be accessible for inspection. Most installations use removable skirting panels that allow access for foundation review.
Skirting also has its own code requirements: ventilation openings, access doors, fire-resistant materials in certain zones.
Permanent foundation typically reduces insurance premiums. Homes on permanent foundations qualify for standard homeowners insurance (HO-7 form), which is cheaper and broader than mobile home insurance.
The savings stack with financing benefits: lower mortgage rate + lower insurance + tax stability after real-property classification = significant lifetime cost reduction.
Disclaimer: Foundation requirements vary by state, county, and program. Verify with structural engineer and loan officer.
Sixty-second short app — no SSN, no hard credit pull. Tell us about your foundation (or send photos via text after you reach out) and what loan you're trying to qualify for. We'll tell you straight whether your foundation works as-is, what it would cost to upgrade, and whether the math justifies the upgrade for your situation.