Manufactured Home Foundations

A manufactured home is only as solid as the foundation beneath it, and in Oregon, that foundation must be engineered to withstand seismic activity, high winds, and the moisture-rich climate of the Pacific Northwest. 3-A Construction, LLC has been building manufactured home foundations across Oregon for over 20 years, completing more than 2,000 projects. We understand the engineering requirements, building codes, and soil conditions that determine the right foundation for your specific home and location.

Pier-and-beam foundations are the most common system for manufactured homes in Oregon. This design uses concrete piers set at engineered intervals beneath the home's steel frame, with blocking and shimming to achieve precise leveling. Steel anchoring straps connect the home to the piers and the piers to the ground to resist uplift and lateral movement. We install pier systems that meet HUD and Oregon-specific tie-down requirements for your wind and seismic zone.

Concrete slab foundations are preferred by some homeowners and lenders, particularly when converting a manufactured home to real property. A reinforced concrete slab provides a permanent, stable platform and simplifies utility routing. We pour slabs to engineered specifications with proper reinforcement, anchor bolt placement, and moisture barriers. Slab foundations also support perimeter skirting for a finished, site-built appearance.

Perimeter wall foundations, sometimes called stem wall or crawlspace foundations, enclose the area beneath the home with a continuous concrete wall. This design provides additional structural support, protects utilities from weather exposure, and creates accessible crawlspace storage. Perimeter wall foundations are often required for FHA and VA loan compliance and for real property conversion in Oregon.

Every foundation we build starts with a soil assessment and engineering review. We work with licensed engineers to ensure the foundation design accounts for your specific soil bearing capacity, frost depth, seismic zone, and wind exposure. Proper engineering is not optional in Oregon — it is required by the Building Codes Division and is essential for passing inspection and protecting your investment.

As a bank-approved builder, we understand the foundation requirements that lenders impose for manufactured home loans. Whether you need a standard HUD pier system for a chattel loan or a permanent perimeter foundation for a conventional mortgage, we build it right and provide the documentation your lender requires.