California's structural engineering companies are essential pillars in designing and enhancing infrastructure. They specialize in areas from seismic safety to sustainable building practices, addressing the state's unique geological challenges. Firms range from small private entities to large corporations focusing on innovation, safety, and environmental standards. With seismic resilience and eco-conscious design at the forefront, these companies are poised for growth as they integrate advanced technologies and materials into their projects. The commitment to safety and efficiency positions them to adapt to future building needs, ensuring structural integrity and safety in an earthquake-prone region.


This list includes 20 structural engineering companies based in California, showcasing a mix of small and medium-sized firms founded between 1940 and 2005. Companies like Degenkolb Engineers and Nabih Youssef & Associates excel in specific areas such as seismic evaluations and performance-based design. Operating across key cities like San Francisco, Los Angeles, and San Luis Obispo, these firms deliver tailored engineering solutions that meet diverse client needs while prioritizing safety and sustainability in their projects.


Continue reading for insights on the top structural engineering companies in California.


Top 20 Structural Engineering Companies in California


1. Degenkolb Engineers

  • Website: degenkolb.com
  • Ownership type: Private
  • Headquarters: San Francisco, California, United States (USA)
  • Employee distribution: United States (USA) 96%, Mexico 4%
  • Founded year: 1940
  • Headcount: 201-500
  • LinkedIn: degenkolb-engineers

Degenkolb Engineers, established in 1940, is a structural engineering firm based in San Francisco, California. The company specializes in seismic safety solutions, offering services such as seismic evaluations, retrofitting, and construction engineering. With a workforce of over 300 experienced engineers, Degenkolb emphasizes technical expertise and collaboration with clients to ensure safety and compliance in building design. They primarily serve clients in the healthcare, education, and government sectors, addressing the unique challenges these industries face. Degenkolb has been involved in numerous significant projects, including seismic evaluations and retrofits for educational institutions and healthcare facilities. Their innovative designs have reportedly saved clients substantial amounts of money while enhancing safety. The firm also promotes a culture of lifelong learning and professional development, which is reflected in their annual Degenkolb Conference, where team members share knowledge and insights. This commitment to continuous improvement and community safety positions Degenkolb as a relevant and active participant in the structural engineering industry.


2. Nabih Youssef & Associates

  • Website: nyase.com
  • Ownership type: Private
  • Headquarters: Los Angeles, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1989
  • Headcount: 51-200
  • LinkedIn: nabih-youssef-associates

Nabih Youssef & Associates (NYA) is a structural engineering firm based in Los Angeles, California, with additional offices across the United States and internationally in locations such as Canada, India, and South Korea. Established in 1989 by Nabih Youssef, the firm specializes in structural and earthquake engineering consulting services. NYA is particularly noted for its expertise in performance-based seismic design, a critical area of focus given the seismic risks in many regions. The firm has been involved in a wide range of projects, including high-rise buildings, medical centers, and educational facilities, and has conducted significant work in seismic evaluations and historical preservation. NYA has played a pivotal role in shaping seismic engineering standards and codes, contributing to key documents that guide the industry today. Their commitment to quality and innovation is reflected in their numerous awards and recognitions across various sectors, underscoring their influence and reputation in the structural engineering field.


3. Forell Elsesser

  • Website: forell.com
  • Ownership type: Private
  • Headquarters: San Francisco, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1960
  • Headcount: 11-50
  • LinkedIn: forellelsesser-engineers

Forell/Elsesser Engineers, Inc. is a structural and earthquake engineering firm based in San Francisco, California. Established in 1960, the company specializes in providing structural design, peer review, and value engineering services primarily for clients in the construction and architecture sectors. With a dedicated focus on sustainable design, Forell Elsesser has been involved in numerous civic and educational projects, emphasizing innovative engineering solutions that address contemporary challenges. Their expertise extends to advanced seismic engineering, where they have pioneered techniques such as base isolation and passive damping systems. The firm has also made significant strides in mass timber construction, contributing to projects like the Undergraduate Academic Building at UC Berkeley. Forell Elsesser's commitment to safety, sustainability, and cost-effective solutions positions them as a notable entity in the structural engineering industry.


4. Holmes Structures


Holmes Structures is a structural and fire engineering firm based in San Francisco, California, with additional offices across the United States and internationally in Australia, New Zealand, and the Netherlands. Established in 2001, the company specializes in providing innovative engineering solutions that prioritize safety, compliance, and sustainability in building design. Holmes Structures has a notable focus on retrofitting unreinforced masonry buildings, particularly in seismic zones, and has developed expertise in mass timber construction. Their portfolio includes a variety of projects, such as educational facilities and commercial spaces, showcasing their ability to blend technical excellence with aesthetic considerations. The firm emphasizes collaboration and community engagement, positioning itself as a trusted partner in the construction and architecture sectors. With a workforce of around 77 employees, Holmes Structures is dedicated to advancing engineering practices while addressing contemporary challenges in the built environment.


5. Saiful Bouquet Structural Engineers


Saiful Bouquet Structural Engineers, based in Los Angeles, California, is a private structural engineering firm founded in 1997. With a team of approximately 85 employees, the company specializes in providing comprehensive engineering services across a variety of construction projects. Their work spans multiple sectors, including healthcare, education, and commercial developments. Saiful Bouquet is known for its collaborative approach, working closely with architects and developers to deliver innovative structural solutions that prioritize safety and regulatory compliance. The firm has successfully completed over 6,000 projects, showcasing its extensive experience and expertise. They have received numerous awards for their work, reflecting their commitment to excellence in structural engineering. Saiful Bouquet operates offices in both Los Angeles and San Diego, further solidifying its presence in the Southern California market.


6. Bengal Engineering


Bengal Engineering, based in Santa Barbara, California, is a civil engineering firm established in 1996. The company specializes in a variety of engineering services, including hydraulic, structural, and geotechnical engineering. With a team that boasts over 100 years of combined experience, Bengal Engineering is dedicated to providing cost-effective and accurate designs tailored to the needs of local agencies and businesses. Their portfolio includes significant projects such as the Mission Creek Flood Control and habitat improvements, demonstrating their expertise in managing complex engineering challenges. The firm prides itself on its ability to deliver high-quality designs recognized by federal, state, and local agencies. Bengal Engineering's commitment to infrastructure development and environmental management positions it as a relevant player in the engineering sector.


7. Tipping

  • Website: tippingstructural.com
  • Ownership type: Private
  • Headquarters: Berkeley, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1983
  • Headcount: 11-50
  • LinkedIn: tipping-mar

Tipping is a structural engineering firm based in Berkeley, California, founded in 1983. With a team of 11-50 employees, Tipping specializes in innovative design and seismic resilience, providing advanced analytics and sustainable design solutions tailored to the construction sector. Their projects include notable works such as the UCSF Nancy Friend Pritzker Psychiatry Building and the 680 Folsom Offices, showcasing their ability to blend creativity with technical expertise. Tipping's commitment to seismic safety and sustainable practices reflects their understanding of contemporary challenges in structural engineering. They have received several awards for their projects, highlighting their impact and relevance in the industry. Tipping's collaborative approach ensures that they work closely with clients to achieve project goals, making them a valuable partner in structural engineering.


8. ZFA Structural Engineers

  • Website: zfa.com
  • Ownership type: Private
  • Headquarters: Santa Rosa, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1974
  • Headcount: 51-200
  • LinkedIn: zfa-structural-engineers

ZFA Structural Engineers, based in Santa Rosa, California, is a private structural engineering firm founded in 1974. With a workforce of approximately 103 employees, the company operates across multiple locations in Northern California, including San Francisco, Silicon Valley, Sacramento, and Napa. ZFA specializes in providing engineering solutions for a variety of construction projects, catering to architects, contractors, and public agencies. Their services include structural design for various materials, seismic evaluations, and the rehabilitation of historic structures. ZFA is committed to innovative and sustainable practices, actively participating in initiatives like the SE 2050 Challenge to reduce embodied carbon in their designs. The firm has also been recognized for its contributions to the community, particularly in disaster response efforts, such as their rapid assessment and recovery work following the 2014 Napa earthquake. ZFA's extensive project portfolio and community involvement underscore their relevance in the structural engineering industry.


9. Plump Engineering, Inc.

  • Website: peica.com
  • Ownership type: Private
  • Headquarters: Anaheim, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1989
  • Headcount: 51-200
  • LinkedIn: plump-engineering-inc.

Plump Engineering, Inc. is a private engineering and architectural firm based in Anaheim, California, founded in 1989. With a workforce of approximately 72 employees, the company specializes in civil engineering solutions, offering services that span structural, civil, mechanical, and plumbing engineering. They cater to various sectors, including aerospace, healthcare, and utilities, and operate nationwide. Plump Engineering is known for its hands-on approach and has been involved in notable projects, such as the safe transport of the Space Shuttle Endeavour and the movement of large industrial objects. Their team includes licensed architects and engineers, and they pride themselves on delivering quality solutions for complex infrastructure projects. The firm utilizes advanced technology, including AutoCAD and Revit, to ensure high-quality design processes. Their extensive experience and commitment to integrated project collaboration make them a significant player in the engineering industry.


10. Buehler

  • Website: buehlerengineering.com
  • Ownership type: Private
  • Headquarters: Sacramento, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1946
  • Headcount: 51-200
  • LinkedIn: buehler-engineering

Buehler Engineering Inc., founded in 1946 and based in Sacramento, California, specializes in structural engineering and project management services. The firm operates across multiple states with offices in seven cities, allowing them to serve a wide range of clients, including government agencies and private sector entities. Buehler has a workforce of approximately 141 employees, all dedicated to delivering high-quality engineering solutions. Their extensive experience is reflected in their impressive project portfolio, which includes notable works like the SMUD Museum of Science and Curiosity and the new Natural Resources Headquarters for the California Department of General Services. Buehler has received numerous awards for their projects, highlighting their commitment to excellence and innovation in engineering. They are also actively involved in sustainability initiatives, aiming to reduce the environmental impact of their projects.


11. EDM Services, Inc.

  • Website: edmsvc.com
  • Ownership type: Private
  • Headquarters: Simi Valley, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1990
  • Headcount: 51-200
  • LinkedIn: edm-services-inc.

EDM Services, Inc., based in Simi Valley, California, is an engineering firm that has been providing a wide array of engineering, design, and project management services since its inception in 1990. With a workforce of approximately 60 employees, the company serves industrial, commercial, and private clients across the United States. Specializing in civil, structural, mechanical, and environmental engineering, EDM Services has successfully completed thousands of projects, particularly in the oil and gas sector, as well as public works and land development. Their structural engineering services include foundation design, seismic assessments, and structural analysis, which are essential for ensuring the safety and integrity of various structures. The firm is recognized for its commitment to quality and compliance, having never received a notice of noncompliance or citation for its work. Additionally, EDM Services is certified as a Disadvantaged Business Enterprise by the California Public Utilities Commission, reflecting its dedication to community involvement and regulatory compliance.


12. Hohbach-Lewin Structural and Civil Engineers

  • Website: hohbach-lewin.com
  • Ownership type: Private
  • Headquarters: Palo Alto, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1998
  • Headcount: 51-200
  • LinkedIn: hohbach-lewin

Hohbach-Lewin Structural and Civil Engineers, established in 1998, is a private engineering firm based in Palo Alto, California, with additional offices in San Francisco, Pasadena, and Eugene, Oregon. The company specializes in providing structural and civil engineering services to architects, building owners, and contractors. Their expertise spans a wide range of projects, including academic institutions, healthcare facilities, and affordable housing developments. Hohbach-Lewin is recognized for its commitment to safety and design standards, ensuring that all projects meet regulatory requirements. The firm prides itself on delivering timely and effective solutions, which has earned them a reputation for reliability among clients. They operate as a certified small business enterprise in California and federally, emphasizing their dedication to quality service and professional integrity.


13. AQX Engineering, Inc

  • Website: aqxeng.com
  • Ownership type: Private
  • Headquarters: Santa Ana, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1981
  • Headcount: 11-50
  • LinkedIn: aqx-engineering-inc

AQX Engineering, Inc. is a privately owned engineering firm based in Santa Ana, California, with additional branch offices in San Jose and Santa Clara. Founded in 1981 and rebranded in 2004 under the leadership of Dr. Qiang Xiao, the firm offers a comprehensive suite of engineering services, including structural, civil, and MEP engineering. AQX Engineering has worked on a variety of projects, ranging from residential remodels to large commercial developments and federal projects. Their expertise includes specialized structural engineering for temporary and permanent shoring systems, post-tension slabs, and concrete podiums. The firm serves a broad clientele, which includes residential homeowners, commercial developers, and government entities, showcasing its adaptability and commitment to quality in engineering design and construction management.


14. Miyamoto International

  • Website: miyamotointernational.com
  • Ownership type: Private
  • Headquarters: West Sacramento, California, United States (USA)
  • Employee distribution: United States (USA) 53%, India 16%, Puerto Rico 6%, Other 24%
  • Founded year: 1946
  • Headcount: 201-500
  • LinkedIn: miyamoto-international

Miyamoto International, based in West Sacramento, California, is a structural engineering firm with a strong emphasis on disaster management and earthquake resilience. Established in 1946, the company has developed a robust portfolio that includes services in structural engineering, seismic monitoring, and disaster risk reduction. With a workforce of approximately 236 employees, Miyamoto operates in various earthquake-prone regions worldwide, including locations in the United States, India, Nepal, and Turkey. Their mission is to save lives and impact economies by providing engineering solutions that enhance community safety and infrastructure resilience. The firm has been involved in over 100 disaster response operations, showcasing its commitment to rebuilding and recovery efforts in the aftermath of significant seismic events. Miyamoto International also engages in humanitarian assistance through its nonprofit arm, Miyamoto Relief, which further highlights its dedication to making a positive impact in vulnerable communities.


15. TETER Architects and Engineers

  • Website: teterae.com
  • Ownership type: Private
  • Headquarters: Fresno, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1979
  • Headcount: 51-200
  • LinkedIn: teter-architects-and-engineers

TETER Architects and Engineers, based in Fresno, California, has been a prominent player in the architectural and engineering services industry since its founding in 1979. The firm specializes in creating efficient and aesthetically pleasing designs, with a strong emphasis on collaboration and sustainability. TETER's team of architects and engineers work closely together, ensuring a seamless design process that caters to the specific needs of their clients, which include educational institutions and various government agencies. Their service offerings include structural engineering, plumbing, mechanical, and electrical engineering, showcasing their comprehensive approach to project development. TETER is also committed to fostering long-term relationships with clients, which is evident in their community-focused initiatives and employee ownership model. This structure not only enhances their service quality but also aligns their interests with those of their clients, promoting a shared vision for successful project outcomes.


16. Kleinfelder

  • Website: kleinfelder.com
  • Ownership type: Private Equity
  • Headquarters: San Diego, California, United States (USA)
  • Employee distribution: United States (USA) 95%, Canada 4%
  • Latest funding: September 2023
  • Founded year: 1961
  • Headcount: 1001-5000
  • LinkedIn: kleinfelder

Kleinfelder, Inc. is an engineering and environmental consulting firm based in San Diego, California, with a workforce of approximately 2,600 employees. Established in 1961, the company has developed a strong presence in the engineering sector, providing a wide range of services that include environmental assessments, construction materials testing, and construction management. Kleinfelder serves a variety of clients, including government agencies and private sector companies, particularly in infrastructure projects. Their expertise extends to sustainable development and regulatory compliance, which are increasingly important in today's engineering landscape. The firm operates primarily in the United States, with a small presence in Canada and Australia, and has been involved in numerous significant projects that highlight their capabilities in structural and civil engineering.


17. FICCADENTI WAGGONER and CASTLE Structural Engineers (FWC)


FICCADENTI WAGGONER and CASTLE Structural Engineers (FWC) is a structural engineering firm based in Irvine, California, founded in 1991. The company specializes in providing comprehensive services that include the design of new structures, evaluations of existing buildings, and specialty design solutions. With a team of over 70 professionals, including 20+ licensed structural engineers, FWC has built a reputation for addressing complex engineering challenges. Their client roster features contractors and architects who depend on their expertise to ensure safety and compliance in construction projects. FWC operates multiple offices across the United States, extending their reach and service capabilities. Their portfolio showcases a variety of projects, such as the UNLV College of Hospitality and the Martin Luther King Jr. Medical Center, highlighting their involvement in significant developments across different sectors. FWC's commitment to quality and client education underpins their operational philosophy, which is reflected in their KEE values: Knowledge, Education, and Experience.


18. John A. Martin & Associates, Inc.

  • Website: johnmartin.com
  • Ownership type: Private
  • Headquarters: Los Angeles, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 1953
  • Headcount: 51-200
  • LinkedIn: john-a.-martin-%26-associates

John A. Martin & Associates, Inc. (JAMA) is a structural engineering firm based in Los Angeles, California, with a history spanning over 70 years. Founded in 1953, the firm has built a reputation for excellence in structural engineering services, focusing on seismic evaluations, computational design, and construction services. JAMA serves a variety of clients, including architects, contractors, and public agencies, emphasizing collaboration and innovative solutions to ensure the safety and integrity of structures. The firm has been involved in numerous significant projects, such as the Disney Concert Hall and the UCLA Hammer Museum Expansion, demonstrating their expertise in handling complex designs. JAMA is also recognized for its commitment to sustainability and the preservation of existing structures through seismic retrofitting. Their culture promotes mentorship and professional development, fostering a strong team environment. With a workforce of 51-200 employees, JAMA continues to be a relevant and active player in the structural engineering industry.


19. Ashley & Vance Engineering, Inc.

  • Website: ashleyvance.com
  • Ownership type: Private
  • Headquarters: San Luis Obispo, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Founded year: 2005
  • Headcount: 51-200
  • LinkedIn: ashleyvanceengineering

Ashley & Vance Engineering, Inc. is a civil and structural engineering firm based in San Luis Obispo, California, with additional offices in Colorado, Nevada, and Oregon. Founded in 2005, the company has grown to employ around 84 professionals who are dedicated to providing a range of engineering services, including project management and consulting. They cater primarily to the construction and real estate sectors, assisting clients in navigating engineering challenges to achieve successful project outcomes. The firm prides itself on fostering a unique culture that prioritizes its people and community involvement, which is reflected in their approach to projects. Their portfolio includes significant works such as the adaptive reuse of the Drift Hotel in Santa Barbara and the structural design for BASX Solutions' new welding facility in Oregon. Ashley & Vance Engineering emphasizes practical, smart designs and values strong relationships with clients and within the firm, positioning themselves as a relevant player in the structural engineering industry.


20. T&S Structural

  • Website: tsstructural.com
  • Ownership type: Corporate
  • Headquarters: San Luis Obispo, California, United States (USA)
  • Employee distribution: United States (USA) 100%
  • Latest funding: January 2024
  • Founded year: 1994
  • Headcount: 11-50
  • LinkedIn: taylor-%26-syfan

T&S Structural Engineers, based in San Luis Obispo, California, is a structural engineering firm that has been operational since 1994. With a team of 42 employees, the company specializes in providing structural engineering services across multiple sectors, including residential, commercial, civic, and educational projects. They cater to a wide range of clients, from homeowners to developers and government entities, ensuring that each project meets safety standards and structural integrity requirements. T&S Structural is recognized for its innovative and sustainable design practices, which have been integral to their approach for over three decades. Their extensive portfolio includes notable projects such as the Moxi Wolf Museum of Exploration and Innovation and various residential and commercial developments throughout California. The firm is committed to delivering high-quality engineering solutions while maintaining a focus on collaboration and client support throughout the project lifecycle.



Structural Engineering Insights: Key Companies in California


CompanyHeadquarterSizeFoundedOwnership
Degenkolb EngineersSan Francisco, California, United States (USA)201-5001940Private
Nabih Youssef & AssociatesLos Angeles, California, United States (USA)51-2001989Private
Forell ElsesserSan Francisco, California, United States (USA)11-501960Private
Holmes StructuresSan Francisco, California, United States (USA)51-2002001Private
Saiful Bouquet Structural EngineersLos Angeles, California, United States (USA)51-2001997Private
Bengal EngineeringSanta Barbara, California, United States (USA)1-101996Private
TippingBerkeley, California, United States (USA)11-501983Private
ZFA Structural EngineersSanta Rosa, California, United States (USA)51-2001974Private
Plump Engineering, Inc.Anaheim, California, United States (USA)51-2001989Private
BuehlerSacramento, California, United States (USA)51-2001946Private
EDM Services, Inc.Simi Valley, California, United States (USA)51-2001990Private
Hohbach-Lewin Structural and Civil EngineersPalo Alto, California, United States (USA)51-2001998Private
AQX Engineering, IncSanta Ana, California, United States (USA)11-501981Private
Miyamoto InternationalWest Sacramento, California, United States (USA)201-5001946Private
TETER Architects and EngineersFresno, California, United States (USA)51-2001979Private
KleinfelderSan Diego, California, United States (USA)1001-50001961Private Equity
FICCADENTI WAGGONER and CASTLE Structural Engineers (FWC)Irvine, California, United States (USA)51-2001991Private
John A. Martin & Associates, Inc.Los Angeles, California, United States (USA)51-2001953Private
Ashley & Vance Engineering, Inc.San Luis Obispo, California, United States (USA)51-2002005Private
T&S StructuralSan Luis Obispo, California, United States (USA)11-501994Corporate


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