As structural engineers specializing in architecture, I.L. Gross Structural Engineers provides structural consulting engineering services for architectural structures of all types.

At ILGSE, we pride ourselves on a solid reputation for structural engineering design, consultation, personal attention and responsiveness, and have built our business on work from repeat clients. Considered one of the preeminent leaders of historic preservation in Seattle, our hands-on practical knowledge of the behavior of existing buildings has been learned from decades of experience.  While historic restoration is an intrinsic niche for our firm, we also have long-standing relationships with clients at the top of their field in affordable housing as we proudly support their efforts to provide safe, innovative, and supported services that allow new beginnings for people in stable housing.

ILGSE provides the following
structural design services:

  • Building Design
  • Structural Evaluation
  • Renovation & Historic Restoration
  • Sustainable Design
  • Seismic Design


ILGSE designs projects of all types including: 

  • Historical Structures
  • Affordable Housing Facilities
  • Single Family Residential
  • Churches
  • Higher Education
  • Special Projects
  • Seismic Studies
  • Mixed-Use Architecture
  • Office, Retail and Commercial Buildings
  • Health Care Facilities 
  • Municipal Buildings
  • Libraries

ILGSE provides structural engineering services for a wide variety of structures.

For all of our projects, our company offers innovative, practical, and cost-effective consultation from the initial schematic designs through the completion of the construction process.

The nuanced approach we have developed through years of experience with both new and existing buildings allows us to bring a thoughtful approach and detailing to make buildings that serve both form and function.  Our longstanding relationships with both contractors and design teams throughout the region has resulted in structural designs that are both creative and efficient, but always with an eye towards constructability.  

ILGSE is a small business with a lot of big ideas. Most of our staff have been with the firm for over twenty years; some of whom have been with the company since the beginning of their careers. As our firm’s ownership has evolved, we are registered as an MBE firm with the City of Seattle and working towards state and federal certification as a minority-owned business.

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We are a team of structural engineers with a wealth of experience in all forms of building methods and materials. We have earned a reputation for clear thinking and creativity under pressure that adds special value to our work.