What I L Gross Structural Engineers does

I.L. Gross Structural Engineers (ILGSE) is a privately held structural engineering consulting firm headquartered in Mountlake Terrace, Washington, that provides structural design, evaluation, and consultation services for building structures across the Pacific Northwest. Founded in 1991 by Ira Gross in Seattle's Historic Pioneer Square, the firm specializes in historic renovation and restoration, seismic evaluation and retrofit (including URM buildings and ASCE 41 / ATC 20 methodologies), and structural engineering for affordable and supportive multifamily housing. Its client base spans nonprofit housing developers, public housing authorities, universities, healthcare providers, places of worship, and select commercial and residential developers across Washington, Oregon, California, and Alaska.

The firm's core offering is project-based structural engineering consulting delivered from schematic design through construction completion. Services are organized around building design, structural evaluation, renovation and historic restoration, sustainable design, and seismic design, with a dedicated Seismic Studies and Retrofits service line. ILGSE markets itself as a minority-owned small business registered as a Minority Business Enterprise with the City of Seattle and is pursuing state and federal MBE certification. The technical backbone is conventional structural engineering practice carried out by licensed engineers; the company does not disclose proprietary technology platforms, software products, or AI/ML capabilities.

ILGSE operates a sales-led, relationship-driven go-to-market model with no public pricing or rate cards. The firm relies on long-standing repeat clients, collaborative relationships with architects and contractors, and a project portfolio website for top-of-funnel visibility. Its work is concentrated in the Puget Sound region and broader Pacific Coast, and the firm is currently led by three principals — Robyn Mah (since 1993), Mark Speidel (since 2001), and Victor Martinez — following founder Ira Gross's retirement. The firm has no external funding, no disclosed M&A activity, and no parent company.

Name

I L Gross Structural Engineers

Legal name

I.L. Gross Structural Engineers

Website

https://ilgross.com

Company type

Private

Founded year

1991

Operating status

Operating

Headcount range

101–250 employees

Short description

I.L. Gross Structural Engineers is a minority-owned structural engineering consulting firm based in Mountlake Terrace, WA, providing building design, historic renovation, seismic retrofit, and affordable housing structural services to nonprofit developers, housing authorities, universities, and public-sector clients across the Pacific Northwest.

Ownership category

akta.pro rank

Product category

Structural Engineering Services

NAICS

Engineering Services (54133), Architectural, Engineering, and Related Services (5413)

SIC

Services-Engineering Services (8711)

akta.pro primary industry

Civil & Structural Engineering Consulting (BPAHAIAA)

akta.pro secondary industry

Construction Engineering & Constructability Consulting (BPAHAIAN)

Keywords

• Structural engineering services
• Historic building renovation
• Seismic retrofit design
• Affordable housing engineering
• Building structural consulting

Headquarters

HQ city

Mountlake Terrace

HQ country

United States

HQ region

North America

Offices1 record

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Infrastructure

Revenue model

1. Structural Engineering Consulting Services: The firm generates revenue through providing structural engineering design, consultation, and evaluation services for architectural projects. Services include building design, structural evaluation, renovation and historic restoration, sustainable design, and seismic design. Revenue is project-based consulting fees.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels1 record

Core offering

I.L. Gross Structural Engineers provides structural consulting engineering services for building structures of all types, from initial schematic designs through construction completion. Core services include building design, structural evaluation, renovation and historic restoration, sustainable design, and seismic design, with particular specialization in historic renovation, seismic evaluation and retrofit, and affordable housing projects in the Pacific Northwest.

Product overview

I.L. Gross Structural Engineers offers structural consulting engineering services for building structures, providing a unified service offering that includes building design, structural evaluation, renovation and historic restoration, sustainable design, and seismic design. The firm specializes in various project types including historical structures, affordable housing, single family residential, churches, higher education facilities, mixed-use architecture, commercial buildings, healthcare facilities, municipal buildings, and libraries. Their core service is comprehensive structural engineering consulting from initial design through construction completion, with notable expertise in historic preservation and seismic retrofit projects.

Differentiator

Problem solved

Functional benefit

Products and services

• Structural Engineering Consulting Services Comprehensive structural consulting engineering services for building structures of all types, delivered from initial schematic design through construction completion. Includes building design, structural evaluation, renovation and historic restoration, sustainable design, and seismic design, with deep expertise in historic preservation, seismic retrofit, and affordable housing.
• Building Design Structural design services for new building construction projects.
• Structural Evaluation Assessment and analysis of existing building structures for structural integrity and safety.
• Renovation & Historic Restoration Structural engineering services for renovation and restoration of historic buildings, preserving original character while updating structural integrity.
• Sustainable Design Structural engineering services incorporating sustainable design principles for building projects.
• Seismic Studies and Retrofits Specialized seismic evaluation and retrofit services including ASCE 41 methodology reports, feasibility studies, building condition surveys, and post-earthquake safety evaluations using ATC 20 methodology.

Quantifiable outcome

• Over 30 years of experience in the Puget Sound structural engineering market

Named customers15 records

Segments6 records

Ideal customer profiles4 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Scale indicators3 records

Recent moves5 records

Expansion highlights3 records

Broad incumbents

• Arup: Global engineering consultancy with a Seattle presence providing structural engineering services for major buildings, infrastructure, and seismic projects. Comparable as a structural engineering competitor in the Pacific Northwest, though at vastly greater scale and broader service mix.
• KPFF Consulting Engineers: Large Seattle-headquartered civil and structural engineering firm with offices across the U.S. Provides structural engineering services to commercial, institutional, and public sector clients. Comparable core service offering, but KPFF operates at much greater scale and breadth than ILGSE.
• Magnusson Klemencic Associates (MKA): Seattle-based structural and civil engineering firm with broad national and international practice across commercial, civic, and cultural buildings. Comparable as a Pacific Northwest structural engineering peer, but with a much larger scale and broader commercial focus than ILGSE's affordable housing/historic preservation niche.

Direct peers

• Coughlin Porter Lundeen: Seattle structural engineering consultancy serving commercial, healthcare, education, and civic clients. Comparable mid-size Pacific Northwest structural peer with similar service offering and client mix, including renovation and new construction work.
• PCS Structural Solutions: Seattle-based structural engineering firm focused on building structures for healthcare, education, commercial, and civic clients in the Pacific Northwest. Comparable size, geographic focus, and structural engineering service mix to ILGSE.
• DCI Engineers: Seattle-based structural engineering firm serving commercial, residential, healthcare, and education clients across the western U.S. Direct peer in scale and geography, providing structural engineering services to many of the same institutional and developer client types as ILGSE.
• Reid Middleton: Washington-based structural and civil engineering firm serving public and private clients in the Pacific Northwest, with notable work in seismic engineering and building renovation. Comparable Pacific Northwest structural peer, particularly in seismic retrofit practice.
• Lund Opsahl: Seattle structural engineering firm providing structural design, seismic evaluation, and renovation services for buildings. Comparable peer given shared Pacific Northwest geography, structural consulting focus, and emphasis on existing building evaluation and seismic work.
• Swenson Say Fagét: Seattle structural engineering firm providing services for new construction and renovation projects across commercial, institutional, and residential markets. Comparable Pacific Northwest structural peer with similar project type diversity.

Regional players

• Holmes Structures: San Francisco-based structural engineering firm with deep seismic retrofit and historic renovation expertise serving the Bay Area and broader West Coast. Comparable peer in seismic and historic preservation focus, but with primary geographic emphasis on California rather than the Pacific Northwest.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat3 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/i-l-gross-structural-engineers-llc

Compliance1 record

Revenue estimate

Valuation estimate

Number of profiles

Profiles3 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about I L Gross Structural Engineers