Skip to main content

Structural engineering · Portland, OR

Structural Engineering Services in Portland, OR

Connect with engineering firms serving Portland and the surrounding metro area. Common work runs from load-bearing wall removals and additions to ADUs, basement conversions, seismic retrofits and more.

Also searched as: residential structural engineer Portland OR · stamped structural calculations Portland · Portland ADU structural engineer · Portland seismic retrofit engineer · structural engineer near me Portland

Find an engineer in PortlandStart a beam design

Local code & loads

Portland building code & ASCE 7 design loads

Portland enforces the 2025 Oregon Structural Specialty Code (OSSC), based on the 2024 IBC. Stamped calculations submitted for permit reference the design parameters below.

Values shown for reference only — project-specific values from the ASCE 7 Hazard Tool should be used for engineering design at the actual project address.

ASCE 7 design parameters

Default values used for most residential and light-commercial projects in Portland. Site Class and seismic spectral values may shift based on geotechnical investigation.

Building code2025 Oregon Structural Specialty Code (OSSC), based on the 2024 IBC
ASCE 7 editionASCE 7-22
Seismic Sₛ0.95g
Seismic S₁0.36g
Site classDefault
SᴅS0.77g
Sᴅ₁0.52g
Seismic Design CategoryD
Ultimate wind speed97 mph
Ground snow load25 pdf minimum per OSSC, confirm with local project specific requirements

Risk Category II assumed for typical residential and light commercial use — confirm with your engineer if the occupancy or use may require a higher category.

Portland is a Seismic Design Category D area. The offshore Cascadia Subduction Zone is the headline hazard, and shallow crustal faults such as the Portland Hills Fault add to it. Much of the city sits on fine-grained Willamette Valley silt and alluvium with a seasonally high water table, while the West Hills bring steep-slope and landslide concerns. The values below are regional placeholders only. Always pull site-specific values from the ASCE 7 Hazard Tool (https://ascehazardtool.org) for the actual project address.

Common projects engineers design in Portland

The work engineers handle frequently in Portland and the surrounding Multnomah County.

  • Load-bearing wall removals and open-concept remodels
  • Accessory dwelling units (ADUs) and detached units
  • Basement and daylight-basement conversions
  • Room additions and second-story additions
  • Seismic retrofit of older homes (foundation bolting, cripple-wall bracing)
  • Hillside and steep-slope foundation design in the West Hills
  • Deck, balcony, and porch structures
  • Rooftop solar array structural verification

What's different about Portland

Local conditions that affect structural design

City-specific factors that show up in many Portland calculations — and the things plan reviewers look for.

Portland's earthquake risk comes from two directions: the deep Cascadia megathrust offshore and shallow crustal faults like the Portland Hills Fault that run beneath the city. Both push lateral design and a continuous load path to the front of most projects.
Older houses are a big part of Portland's seismic retrofit market. Bolting the framing to the foundation and bracing cripple walls is common work, and it often gets folded into a remodel while walls are already open.
Soils across much of the city are fine-grained Willamette Valley silt and alluvium, sometimes over older flood deposits, with a seasonally high water table. That combination makes drainage and foundation design worth checking carefully, and a geotechnical report is often warranted for additions and new foundations.
The West Hills bring steep slopes and a history of landslides in the local silt, which can be strong when dry and weak when saturated. Projects on these lots usually need a slope hazard evaluation and engineered foundations or retaining walls.
Portland's ADU boom keeps demand high for detached units and basement conversions, both of which lean on stamped structural calculations for framing, beams, and foundations.

Permits

Where to submit your Portland permit

Stamped calculations from clearspan are submitted directly to the Portland Permitting & Development (PP&D). Most residential structural submittals are reviewed online.

Building department

Portland Permitting & Development (PP&D)

1900 SW 4th Ave, Suite 5000, Portland, OR 97201

(503) 823-7300

Visit the building department →

Submittal notes

Portland Permitting & Development handles work inside the city. Properties in unincorporated Multnomah County go through county permitting instead. Lots on steep terrain usually trigger a slope hazard evaluation, and certain alterations or changes of occupancy can trigger seismic upgrade requirements. Confirm the jurisdiction before submitting.

FAQ

Structural engineering in Portland — FAQs

The questions Portland contractors and homeowners ask most often.

Do I need an engineer to remove a wall in my Portland home?+
If the wall is load-bearing, stamped structural calculations from an engineer will help you avoid plan-review comments and keep the Portland permit moving.
Should I add a seismic retrofit while remodeling my older Portland house?+
It is often the right time. With walls open, an engineer can design foundation bolting, cripple-wall bracing, and load-path connections that bring an older home up to current standards, frequently for less than doing the work on its own later.
How quickly can I get stamped calculations for a Portland permit?+
Most residential beam and wall-removal calculations are turned around within a few business days through clearspan's process. Timelines depend on scope, and availability of an engineer to review and accept the design through clearspan.

Nearby cities

Structural engineers in other Portland Metro cities

Browse city pages for nearby jurisdictions.

Hillsboro, OR→Bakersfield, CA→Citrus Heights, CA→Clovis, CA→Concord, CA→Davis, CA→
Find a structural engineer →Structural engineering services →Structural engineering guides →For engineering firms →

Need a beam designed quickly in Portland?

Submit your project details and get a design in minutes, then submit to a licensed Oregon engineer for review.

Get started