King County, Washington
Civil and Structural Engineers in Kent, WA
Civil and structural engineering for homeowners, builders and developers. Plans and reports sealed by a PE licensed in the state, ready for the local building department.
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
Services we provide here
Residential
Retaining Wall DesignSwimming Pool EngineeringADU Site and Structural EngineeringResidential Site Plan for a New HomeDriveway Permit and Culvert EngineeringHillside and Steep Lot Engineering
Site Development & Land
Land Development Feasibility StudyCommercial Site Plan and Civil DesignSubdivision Engineering and Plat SupportLot Split and Minor SubdivisionMass Grading and Earthwork PlanParking Lot DesignSolar Farm Civil DesignEV Charging Station Site DesignZoning, Rezoning and Entitlement SupportEngineer's Cost Estimate and Bond EstimateTopographic SurveyBoundary and ALTA/NSPS Survey
Drainage, Stormwater & Flood
Yard Drainage and Flooding EngineeringGrading and Drainage PlanAs-Built Lot Grading CertificationStormwater Management PlanDetention and Retention Pond DesignDrainage Study and Hydrology ReportGreen Infrastructure and Rain Garden DesignFlood Elevation CertificateLOMA, LOMR-F and LOMR Flood Map ChangesFloodplain Development Permit and No-Rise CertificationV-Zone Coastal Construction CertificationSeawall and Bulkhead DesignDock, Pier and Boat Lift EngineeringPond and Small Dam Design
Foundations & Structural
Foundation Inspection by an EngineerFoundation Crack EvaluationFoundation Repair Design and OversightBowing Basement Wall AssessmentCrawl Space and Pier-and-Beam AssessmentFoundation Design for a New HomeManufactured Home Foundation CertificationRetaining Wall Failure Assessment
Buildings & Structural
Home Addition EngineeringLoad-Bearing Wall Removal EngineeringDeck and Porch EngineeringStructural Letter for Rooftop SolarPole Barn, Garage and Shed EngineeringStructural Design for a New HomeCommercial Building Structural DesignFacade Inspection (Local Law 11, FISP and City Ordinances)Balcony and Exterior Elevated Element Inspection (California SB 721 and SB 326)Florida Condo Milestone Inspection (SB 4-D)Structural Integrity Reserve Study (SIRS)Parking Garage Condition Assessment (incl. NYC Local Law 126)Seismic Retrofit and Soft-Story OrdinancesHouse Bolting and Cripple Wall BracingHurricane and Wind Mitigation EngineeringSteel and Concrete Structural Repair DesignConcrete Spalling and Balcony Slab Repair DesignBuilding Envelope and Water Intrusion Investigation (Structural Scope)Tower, Sign and Antenna Structural AnalysisCrane Pad and Temporary Works DesignUnderpinning DesignSinkhole Repair Design
Geotechnical & Soils
Geotechnical ReportSoil Boring and Soil TestingSoil Compaction and Construction Materials TestingSinkhole InvestigationSlope Stability and Landslide AssessmentExpansive Clay Soil EvaluationExcavation Shoring and Trench Protection Design
Water, Sewer & Septic
Septic System DesignSoil Percolation (Perc) TestFailed Septic and Drain Field Replacement DesignWater and Sewer Utility DesignSewer Lift Station and Grinder Pump DesignSewer Lateral and Service Connection DesignFire Flow and Water Main AnalysisWater and Wastewater Treatment DesignLead Service Line Inventory and Replacement Program
Transportation
Traffic Impact StudyTraffic Control Plan (Work Zone)Pavement Design and EvaluationPrivate Road and Subdivision Street DesignCommercial Driveway and State Highway Access PermitCulvert Design and ReplacementBridge DesignBridge Inspection and Load Rating
Permits, Environmental & Compliance
Stormwater Pollution Prevention Plan (SWPPP)Erosion and Sediment Control PlanADA Site Accessibility ComplianceWetland Delineation and Section 404 PermittingPhase I Environmental Site AssessmentSPCC Plan CertificationIndustrial Stormwater Permit ComplianceMS4 Stormwater Program SupportTown and Municipal Engineer Services
Inspections & Reports
Structural Engineer Letter for Mortgage (FHA, VA, Conventional)Structural Inspection Before Buying a HomeSpecial Inspections and Construction TestingAs-Built and Record DrawingsProperty Condition Assessment (PCA)Dam Safety Inspection
Legal & Insurance
Civil Engineering Expert WitnessConstruction Defect InvestigationStorm and Insurance Claim Structural AssessmentFire Damage Structural AssessmentNeighbor Drainage and Flooding DisputeTrip and Fall and Premises Safety Engineering ExpertForensic Engineering and Failure AnalysisPreconstruction Condition Survey and Vibration MonitoringSubstantial Damage and Substantial Improvement Determination Support
Frequently asked questions
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.
Are there special engineering licensing rules in Washington?
Washington licenses Structural Engineers (SE) separately from Professional Engineers.