Who we are

Lee & Lee Structural Engineering Inc. is a Los Angeles–based structural engineering consulting firm established in 1989. From humble beginnings with just two engineers and a drafter, we have grown into a multidisciplinary team trusted by architects, contractors, and developers across California and beyond.

With over three decades of industry experience, we’ve successfully delivered thousands of projects ranging from high-rise commercial towers, hotels, and factories to community churches, multi-unit housing, and adaptive reuse buildings. Our broad portfolio reflects our flexibility across materials, including wood, concrete, structural steel, light-gauge framing, CMU, tilt-up, and hybrid systems.

At the heart of our work is a commitment to safety, practicality, and code compliance. We blend solid engineering principles with state-of-the-art design tools like ETABS, SAP2000, SAFE, and AutoCAD to ensure constructible, economical, and performance driven solutions.

Every project we take on receives direct oversight from a licensed structural engineer. We work closely with our clients to understand their goals, budgets, and constraints and to deliver customized solutions that last.

Whether your project is a ground up development or a seismic retrofit of a historic structure, Lee & Lee is here to guide you from concept to completion with precision and care.

Our values

Our values are the foundation of how we work, collaborate, and deliver. We believe that exceptional engineering is achieved through trusted relationships, technical expertise, and a people-first mindset.


• Our Clients

We are committed to helping our clients realize their vision through collaboration, communication, and tailored structural solutions.

• Our Service

We deliver high-quality, code-compliant design with integrity, precision, and responsiveness—always focused on practical results.

• Our People

Our engineers and staff are dedicated professionals who bring passion, accountability, and deep technical knowledge to every project.

• Our Culture

We foster a culture of continuous learning, innovation, and teamwork—driven by curiosity and a commitment to doing things right.

Founder- sang youck lee, se


Sang Youck Lee is the founder and principal structural engineer of Lee & Lee Structural Engineering Inc. Since establishing the firm in 1989, Mr. Lee has been at the forefront of structural consulting in Southern California, overseeing thousands of projects ranging from residential developments to high-rise commercial towers and institutional facilities.

With over 30 years of experience, Mr. Lee brings deep expertise in structural design, seismic engineering, and building rehabilitation. He has led engineering efforts on complex new builds as well as the restoration and retrofitting of historic and non-ductile structures. His design approach is rooted in engineering fundamentals, and informed by the latest codes, materials, and construction practices.

Mr. Lee holds a Master of Science in Civil Engineering (Structural) from the University of Southern California, and dual M.S./B.S. degrees in Architectural Engineering from Han Yang University in Seoul, Korea. He has also served as a university-level instructor in concrete and steel structure design.

Mr. Lee is a licensed Civil and Structural Engineer in California and Georgia, and continues to mentor younger engineers while maintaining direct involvement in project delivery and client relationships.

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