Skip to Content

HUD/FHA Manufactured Home Permanent Foundation Certification

A Manufactured Home is a structure built on a permanent chassis, transportable in one or more sections that are no more than 8 feet wide and 40 feet long, or 320 square feet when erected on the site. It is designed to be used as a dwelling and contain plumbing, heating, air-conditioning and electrical systems. The category does not include recreational vehicles (RVs), structures designed for temporary living, or modular homes.

Municipal building departments require that the foundation be designed by, and the design sealed by a licensed Professional Engineer. The design must comply with the Ontario Building Code. For existing homes, a Professional Engineer is required to certify that the foundation meets the Ontario Building Code requirements.

A permanent foundation is one that is “constructed of durable materials (concrete, mortared masonry, treated wood) and be site built. It shall have attachment points to anchor and stabilize the manufactured home to transfer all loads to underlying soil or rock. The permanent foundations shall be structurally developed in accordance with this document or be structurally designed by a licensed professional engineer.” Although the design must comply with the manufacturer’s instructions, doing so does not guarantee that it complies with the Ontario Building Code.

The design must provide vertical stability.

  • Anchorage capacity to prevent uplift and overturning due to winds or seismic forces, whichever controls. Screw-in soil anchors are considered permanent anchorage.
  • Footing size to prevent overloading the soil-bearing capacity and avoids soil settlement. Footings shall be reinforced concrete to be considered permanent.

The design must provide lateral stability with anchorage capacity to prevent sliding due to wind or seismic forces, whichever controls, in the transverse or longitudinal direction.

Criterium-Jansen Engineers provides design and certification services that meet the criteria.