When certifying a manufactured home’s foundation, HUD requires that it meets specific criteria outlined in the Permanent Foundations Guide for Manufactured Housing. These include:

1. Permanent Attachment to Foundation
   The home must be permanently affixed to a foundation system designed for long-term residential use.
2. Stability & Load-Bearing Capacity
   The foundation must support the home under all loads (dead, live, wind, seismic, snow) as dictated by local codes and HUD standards.
3. Footings Below Frost Line
   All footings must extend below the frost line or meet equivalent frost protection methods for the home’s geographic location.
4. Anchorage Against Wind & Uplift
   The home must be securely anchored to resist horizontal and vertical forces, including those from wind uplift.
5. Perimeter Enclosure (Skirting or Crawlspace Walls)
   A continuous wall (non-structural skirting or load-bearing perimeter wall) must enclose the foundation to prevent entry of vermin and moisture.
6. Access & Ventilation of Crawlspace
   The crawlspace must have adequate access and ventilation per HUD guidelines.
7. Drainage & Moisture Control
   The area beneath the home must be properly graded to prevent water accumulation, with a vapor barrier installed on exposed soil.
8. Utilities Protected & Permanently Installed
   All utilities (water, sewer, electric, gas) must be permanently installed, protected from damage, and properly supported.
9. Engineer Certification
   A licensed professional engineer must review the foundation and provide a signed, stamped certification stating that it meets HUD’s permanent foundation criteria.