Seismic
Seismic Rehabilitation
Portland is in Seismic Design Category D — the same zone as much of California. Most homes built before 1974 were never required to be anchored to their foundation.
The Pipeline: Find It. Fix It. Strengthen It.
Seismic rehabilitation is the strengthening step in a sequence. A structural condition assessment establishes what you have and its current state. If the structure was damaged, structural repair addresses that first. Seismic rehabilitation then upgrades the structure to resist future earthquake demands — systematically, to an engineering standard.
When You Need an Engineer (Not Just a Contractor)
- Home is on a hillside or slope steeper than 3:1
- Cripple walls taller than 4 feet
- Foundation is not continuous concrete (post-and-pier, brick, rubble)
- Pre-1920 construction with non-standard framing
- Lender or insurance carrier requires a licensed PE evaluation report
- Buying or selling a home — formal seismic condition assessment
- Portland's free prescriptive plans don't apply to your building
- Commercial or multifamily building — URM, soft-story, or other seismic vulnerability
What's Included — Seismic Rehabilitation Evaluation
- Site visit and visual inspection of foundation, cripple walls, and structural connections
- Review of available drawings (or field-measured if none exist)
- Seismic demand calculation (ASCE 7 / local SDC)
- Evaluation against ASCE 41 Tier 1 screening criteria
- Written report with findings, risk rating, and retrofit recommendations — stamped by an Oregon-licensed PE
- Optional: engineered retrofit design drawings for BDS permit
Typical Fees
- Residential seismic rehabilitation evaluation: $800–$2,500
- ASCE 41 Tier 1 screening with stamped report: $2,000–$5,000
- Retrofit design drawings: additional, quoted on scope
Portland Seismic Context
Portland offers free prescriptive retrofit plans for homes with standard cripple walls and flat lots. If your home is on a hillside, has an unusual foundation, or was built before 1920, you need an engineered solution — prescriptive plans won't cover it.
Note: Portland BDS permit fees for seismic strengthening work are waived when total fees are less than $2,500 — making small-scope retrofits effectively free to permit.
Portland also has an active unreinforced masonry (URM) building program targeting older commercial and multifamily buildings. If you own a pre-1940 URM building in Portland, seismic rehabilitation evaluation is increasingly required and time-limited — get ahead of it.
FAQ
What is a seismic evaluation?
A professional assessment of your building's ability to withstand earthquake forces. I review the foundation, cripple walls, connections, and structural framing to identify vulnerabilities — and tell you what, if anything, needs to be done. The result is a stamped written report with findings, risk rating, and retrofit recommendations.
Do I need an engineer or can a contractor assess my home?
Contractors do bolt-and-brace prescriptive retrofits. If your home doesn't qualify for prescriptive plans, or if you need a stamped evaluation report for insurance, lending, or legal purposes, you need a licensed PE. Seismic rehabilitation engineering goes beyond what a contractor's prescriptive scope covers.
Will a seismic retrofit increase my home's value?
Yes — in Portland's market, documented seismic improvements are a selling point for buyers of pre-1978 homes. A stamped evaluation report and permitted retrofit work are disclosable improvements that protect both seller and buyer.
Know Your Risk Before the Next Earthquake
Schedule a seismic rehabilitation evaluation. Find out if your building qualifies for prescriptive plans — or if it needs an engineered solution.
Schedule an Evaluation