15 Best Engineering Firms in Seattle

Puget Sound Engineering focuses on residential structural engineering in Seattle and the wider Puget Sound area. Its work covers structural inspections, new-home design, additions, remodels, foundations, framing systems, beams, columns, and load-path analysis. The firm also prepares structural calculations, drawings, and documentation commonly used for residential permitting.

D.R. STRONG Consulting Engineers serves Seattle with civil engineering, land surveying, planning, and site development services. Its work spans individual homes and landowners, multifamily and commercial development, subdivisions, public entities, and municipalities. Surveying capabilities include boundary and topographic information, construction staking, and right-of-way and utility work.

Moderno Engineering provides structural and civil engineering plans, calculations, consultations, and structural inspections for homes and commercial buildings throughout greater Seattle. The firm works with wood-framed, steel, and concrete structures, including remodels, additions, new DADUs, foundations, and projects involving load-bearing walls.

AeroTEC’s Seattle Engineering Center supports aerospace programs through aircraft development, engineering, manufacturing, modification, testing, and certification. Its in-house capabilities cover aircraft systems, structures, integrations, and specialized mission platforms, allowing work to progress from conceptual design toward a finished, tested solution.

Kent Engineering LLC brings scientific consulting, engineering, inspection, and forensic services to Seattle across building systems, materials, vehicles, equipment, and industrial applications. Its specialist work includes cranes, hoists, lifting equipment, welding engineering, and forensic investigations across construction, transportation, maritime, plumbing, and related fields.

Psomas provides engineering consulting and construction management in Seattle, with experience spanning public infrastructure, transportation, water and wastewater facilities, structures, and other major works. Its construction management team takes a proactive approach, identifying potential obstacles before they become costly project delays.

Support can range from staff augmentation to full construction management on large, multi-year infrastructure programs. The collaborative working style is geared toward coordinated delivery and practical professional services across complex project environments.

KPFF Consulting Engineers provides structural, civil, survey, and protective design services from Seattle for commercial, transportation, energy, and federal work. Its multidisciplinary reach supports projects ranging from site and infrastructure assignments to complex buildings and large-scale AEC programs.

The firm’s value lies in bringing multiple engineering disciplines together under one organization, with design solutions intended to be thoughtful and practical even when project requirements are demanding.

GeoEngineers is a Seattle-based engineering and earth science consultancy serving projects that require geotechnical, environmental, and related technical expertise. Its multidisciplinary team supports complex sites from early conceptual work through design and implementation, bringing together specialists for the specific demands of each assignment.

Abossein Engineering Corporation offers full-service engineering in Seattle across mechanical, electrical, civil, structural, plumbing, LEED, fire protection, safety, and energy-related disciplines. Its integrated scope is useful for building projects where several systems must be coordinated from design through construction.

Coughlin Porter Lundeen provides civil and structural engineering in Seattle, supporting projects from conceptual design through building occupancy. Its portfolio includes work across varied sizes and complexities, with a focus on thoughtful design, technical quality, and close client relationships.

Igor Institute is a Seattle product engineering consultancy helping teams move complex products from concept toward market-ready development. Its capabilities include product leadership, mechanical engineering, electrical engineering, and firmware engineering, with a focus on solving technical challenges while strengthening usability and brand value.

Integra Testing Services provides engineering and building-performance testing in Seattle, including TAB testing for ventilation systems. The team is equipped to respond efficiently when a project needs prompt measurement, organized fieldwork, and a clear explanation of what the results mean.

Its practical value extends beyond producing test results: technicians can help interpret findings and identify ways to improve ventilation performance. The company formerly operated as Neudorfer Engineers, so that earlier name may still appear in project references.

Pacific Engineering Technologies provides structural engineering and architectural services in Seattle and throughout the Pacific Northwest. Its specialties include damage investigations, construction-defect investigations, building-envelope evaluation and design, repair design, new construction, and permitting support.

IMEG is a Seattle engineering design and consulting firm focused on the built environment, with services spanning engineering, planning, infrastructure, sustainability, and specialized facility needs. Its work includes energy modeling, decarbonization planning, renewable energy assessments, LEED and WELL support, and full-service design for buildings of varied scale and complexity.

Magnusson Klemencic Associates is a Seattle-headquartered structural and civil engineering firm serving projects worldwide. Its work includes buildings of varied size and complexity, site design, architectural and landscape projects, and detailed digital modeling for demanding AEC programs.

MKA pairs specialized technical teams with direct involvement from senior staff, encouraging close collaboration between design engineers, modelers, and project leaders. The firm’s emphasis on inventive, collaborative solutions suits clients pursuing ambitious buildings, complex sites, and technically distinctive designs.