Oregon Boxabl Casita Concrete Block & Pier Foundation Plans
Stamped, site-specific planset + calculation package, engineered for your parcel and delivered in 24 business hours. Cascadia seismic detailing west of the mountains; statewide ADU rights make backyard units routine.
What You Get
- Stamped concrete block & pier foundation planset, site-specific to your Oregon parcel
- Supporting structural calculation package
- Engineered anchorage at the Casita’s bearing points (ESR-4725 SIP system)
- One revision cycle included
- Formatted for permit submittal to your building department
What You Send Us
- Project address
- Site survey or parcel map
- Soil report (if you have one — not required)
- Permit number (if already issued)
- Anything else relevant: HOA rules, grading plan, photos
The 24-hour clock starts when documentation is complete. Same-day rush: call 813-694-8989 first.
Why a Concrete Block & Pier in Oregon?
Discrete piers supporting the unit at engineered bearing points — minimal excavation and site disturbance. Best fit: Uneven or sensitive sites, rocky ground, or projects that want the least concrete and disturbance.
In Oregon specifically, the design drivers are: frost depth 12–18" west of the cascades; 24–36" east; design winds 95–110 mph; high seismic (western oregon is sdc d territory (cascadia) — shear transfer and hold-downs are mandatory engineered items.). Soils: willamette valley clays; volcanic soils east of the cascades. Your plans are engineered to these conditions at your parcel — not generic minimums.
What our plans coordinate for you:
- Pier layout tolerance at unit bearing points
- Beam/bearing elevation control
- Long-term leveling and access
- Anchorage detailing for uplift
Typical design basis for these packages: current IBC/IRC as adopted by your jurisdiction, Risk Category II, with wind, seismic, frost, and soil-bearing values set site-specifically for your parcel. Sample criteria shown in our public materials (e.g., Exposure C, 140 mph ultimate wind, ~2,000 psf assumed bearing) are illustrative only — your stamped set uses your site’s values.
Questions
How fast do I get my Oregon foundation plans?
Within 24 business hours after full documentation — project address, site survey or parcel map, and any soil report or permit number you have. Same-day rush is sometimes available; call first to confirm.
Are these plans permit-ready in Oregon?
Yes. You receive a stamped, site-specific foundation planset plus a calculation package from a Professional Engineer licensed in Oregon, formatted for permit submittal. One revision cycle is included.
Do I need a soil report?
Not always — we design to conservative assumed values when no report exists, and note them on the plans. If your jurisdiction requires a geotechnical report, or your site has known soil issues, send it and we design to it.
What if a concrete block & pier isn’t right for my site?
Then don’t force it — Slab-on-Grade and Stem Wall plans are the same price, and if your site is genuinely complex (steep slope, flood zone, unusual soils) we’ll route you to custom engineering instead. When in doubt, call 813-694-8989 before ordering.
Permit-ready tomorrow.
$749 flat. One revision included. Stamped by a PE licensed in Oregon.
Questions first? Call 813-694-8989 or send project details.
BoxablFoundations.com is an independent service operated by Oasis Engineering LLC. Not affiliated with, endorsed by, or sponsored by Boxabl Inc. BOXABL is a trademark of Boxabl Inc.