Washington
Seawall and Bulkhead Design
Engineering for new, replacement and repaired seawalls and bulkheads, including permits for work on the water.
What the work involves
Seawalls and bulkheads retain soil at the water's edge and resist waves, tides and scour. A coastal, civil or structural engineer designs sheet piles, tiebacks, caps and toe protection, and prepares drawings for state environmental and US Army Corps of Engineers permits. Engineering is also used to diagnose failures such as sinkholes behind the wall, leaning or cracking caps.
Local conditions we plan for
- Cascadia Subduction Zone and Seattle Fault seismic hazard
- Landslides on wet slopes
- Liquefiable soils near Puget Sound
- Wildfire east of the Cascades
Building code: 2021 IBC/IRC adopted at the state level (ICC adoption chart, April 2026).
When you need it
- Replacing a failing or leaning seawall
- Sinkholes or soil loss behind the wall
- New bulkhead on a canal, lake or bay
- State or Army Corps permit requires stamped drawings
- Raising wall height for sea level or storm surge
Frequently asked questions
How much does seawall and Bulkhead Design cost?
Across the US, seawall and Bulkhead Design usually costs $2,000 to $15,000. Estimate for engineering. Construction is separate: HomeAdvisor reports most residential seawalls cost $15,000 to $60,000 ($100 to $800 per linear foot), with permits $150 to $2,500.
How long does seawall and Bulkhead Design take?
Plan on 3 to 12 weeks plus permit review from signed proposal to stamped deliverables, longer if a site visit, soil testing or a permit review cycle is involved.
Do I need a licensed PE for seawall and Bulkhead Design?
In most US jurisdictions, yes. When the work needs a permit, the plans, calculations or report usually must be sealed by a Professional Engineer licensed in the state where the project is located. Every deliverable we issue for permit is sealed that way.
How do I verify an engineer's license in Washington?
Engineers practicing in Washington are licensed by the Washington State Board of Registration for Professional Engineers and Land Surveyors. You can confirm a license number and its status in the board's public license search before you sign a contract.
Which building code applies in Washington?
2021 IBC/IRC adopted at the state level (ICC adoption chart, April 2026). Cities and counties can add local amendments, which is one reason to hire an engineer who works in your area.
What site problems do engineers see most in Washington?
Common issues include cascadia Subduction Zone and Seattle Fault seismic hazard, landslides on wet slopes, liquefiable soils near Puget Sound and wildfire east of the Cascades.