Jefferson Manufactured Home Installation & Site Development

Jefferson is a small city in southern Marion County, situated where the Santiam River meets the Willamette River. It is also the home base of 3-A Construction, LLC. Our offices, equipment yard, and staging area at 1690 Harvey St SE between White Lane and Mitchell Street serve as the hub for every project we manage across the Willamette Valley and beyond. Being headquartered in Jefferson means our overhead stays low, our equipment is maintained in-house, and our crews deploy efficiently to job sites in every direction.

The terrain around Jefferson is classic Willamette Valley bottomland: flat to gently rolling, with alluvial soils deposited by the Santiam and Willamette rivers over thousands of years. These soils are fertile and generally workable for construction, though the water table can be seasonally high near the river confluences. We know Jefferson's ground conditions better than anyone because we have built on them more than anywhere else. Foundation design, drainage planning, and septic system engineering in this area are second nature to our team.

Jefferson falls under Marion County jurisdiction for planning and building permits on properties outside city limits, and the City of Jefferson handles permits within the city boundary. The surrounding area includes a mix of small rural residential lots, larger agricultural parcels, and properties along Highway 99E and Jefferson-Scio Drive. We have completed hundreds of projects in and around Jefferson, from manufactured home installations and replacements to new garages, pole barns, septic systems, and complete site development packages.

As our home community, Jefferson is where you will find our most concentrated project history. We have placed homes, poured foundations, installed septic systems, and built accessory structures on properties throughout the Jefferson area, including along Talbot Road, Marion Road, and the rural roads east toward Scio. Our neighbors know our work firsthand, and many of our best referrals come from right here in Jefferson. When you work with 3-A Construction, LLC, you are working with a company that is genuinely rooted in this community.

Our owner, Jesus Andrade, established 3-A Construction, LLC in Jefferson in 2005, and the company has grown from a small local operation to one of Oregon's top-ranked contractors with an A+ BBB rating and a BuildZoom score in the top 2% of all licensed Oregon contractors. That growth happened without ever leaving Jefferson, because this is where we belong. Every permit, every project, every satisfied customer reinforces our commitment to doing business the right way from our Jefferson headquarters.