Oregon's ADU legislation opened the door for a lot of homeowners to add a real living unit to their property. The foundation is the part of the build that has to be permitted, engineered, and inspected before anything stands on top of it. We pour ADU foundations across the Umpqua Valley and we know the local permitting process well enough to keep your schedule moving.
Foundation options for ADUs
Most detached ADUs in the valley sit on one of two foundation types, depending on slope, soil, and what the engineer specs.
- Monolithic slab-on-grade with thickened edge, fastest and most common
- Stem wall on continuous footing, better for sloped lots and crawl space access
- Pier and grade beam, for sites with poor or expansive soils
What we handle, what you handle
We pour the foundation to the structural plans your designer or engineer provides. We do not draw the plans, run the architectural design, or pull the building permit (that goes to the GC or owner-builder). We do handle the foundation inspection, the rebar, the anchor bolts, the holdowns, and the as-built sign-off for the foundation portion.
Schedule realities
ADU foundations book up fast May through September. If you are pouring this year, get the quote in the queue early. We schedule first-come on signed contracts and we do not bump customers for bigger jobs.