Business Details
50+ Years
experience
Your Trusted Engineering Partner in Oakland, CA
Yei Engineers was founded in 1975 with a commitment to delivering innovative engineering solutions. Headquartered in Oakland, California, we specialize in mechanical, electrical, and plumbing (MEP) engineering for municipal, institutional, commercial, educational, and federal projects. Our approach emphasizes senior-level involvement, ensuring technical expertise is applied to every project. We prioritize collaboration, cost-effectiveness, and on-time delivery while offering flexible designs to enhance usable space and support construction administration. With over 40 years of experience, our team of 20+ professionals brings the expertise of a large firm while maintaining the agility of a small business.Our engineers have authored over 30 technical papers and hold patents in electrical distribution systems. We maintain branch offices in San Francisco and San Jose to better serve clients across Northern California. Sustainability and energy efficiency are core to our practice, with capabilities in LEED certification, energy management, and renewable energy systems. Our legacy of technical excellence is built on the foundation of Moon H. Yuen, our founder and a Fellow of the IEEE, who pioneered simplified methods for electrical system analysis. Today, we continue to provide reliable, practical, and high-quality engineering services tailored to client needs.
Services
Electrical Engineering
Mechanical Systems
Fire Protection
Plumbing Design
Sustainability Solutions
Details
- Year established: 1975
Highlights and features
- We offer 40+ years of specialized MEP engineering experience
- Our senior engineers provide direct project involvement from concept to completion
- We hold patents in electrical distribution system analysis methods
- Our team has authored over 30 technical papers in engineering journals
- We maintain LEED-certified professionals for sustainable design expertise
Associations and certifications
- IEEE
- LEED Certification
Services
Electrical Engineering
We design complete electrical power systems including medium/high voltage infrastructure, emergency power solutions, and lighting controls. Our engineers specialize in utility coordination, arc flash studies, and solar photovoltaic systems. With expertise in Title 24 compliance and short circuit analysis, we deliver safe, efficient electrical systems for commercial and institutional buildings.
Mechanical Systems
Our mechanical engineering covers HVAC systems, hydronic piping, and industrial exhaust solutions. We design chilled water systems, building automation controls, and energy-efficient heating/cooling systems. Our team specializes in cooling tower applications, fuel storage tanks, and process piping distribution for complex facilities like laboratories and data centers.
Sustainability Solutions
We integrate sustainable design principles through energy modeling, LEED certification support, and renewable energy systems. Our services include photovoltaic installations, cogeneration systems, and energy demand management strategies. We provide detailed payback analysis and tax credit submissions to maximize environmental and economic benefits for clients.
Fire Protection
Our fire protection engineering includes fire alarm systems, suppression systems, and code compliance analysis. We design solutions that integrate with building mechanical systems while ensuring adherence to safety standards. Our team provides comprehensive fire protection strategies for commercial, institutional, and transportation infrastructure projects.
Plumbing Design
We engineer comprehensive plumbing systems including sanitary drainage, water distribution, and medical gas piping. Our designs incorporate greywater conservation, tank storage solutions, and specialized gas distribution systems for healthcare facilities. We ensure code compliance while optimizing water efficiency and system reliability.
People
Patrick R. Mallillin
Principal Mechanical Engineer
With over 25 years of experience, Patrick leads mechanical engineering projects focusing on HVAC systems and energy-efficient building solutions. He specializes in data center cooling and underfloor air distribution systems.
George Cheung
Principal Electrical Engineer
George oversees electrical engineering projects with expertise in power systems and lighting design. He has led electrical upgrades for major transportation infrastructure projects across Northern California.
Brandon Yee
Principal Electrical Engineer
Brandon specializes in medium voltage systems and emergency power solutions. He has extensive experience in utility coordination and arc flash analysis for complex commercial facilities.
Hubert Hidalgo
Principal Mechanical Engineer
Hubert leads mechanical system designs for institutional projects, focusing on hydronic piping and industrial exhaust systems. He has contributed to numerous LEED-certified building projects.
Jennifer Huynh
Principal Electrical Engineer
Jennifer specializes in sustainable electrical systems, including photovoltaic installations and energy management strategies. She has led electrical designs for multiple award-winning educational facilities.
Questions
What engineering services does YEI offer?
We provide mechanical, electrical, plumbing (MEP) engineering, and sustainability solutions for commercial, institutional, and transportation projects.
How long has YEI Engineers been in business?
We've delivered engineering solutions since 1975, with our founding engineer developing simplified electrical analysis methods still used today.
Do you handle large-scale infrastructure projects?
Yes, our portfolio includes transit systems, airports, data centers, and LEED-certified buildings across Northern California.
What makes YEI different from other engineering firms?
We combine senior-level engineer involvement with technical innovation, having authored industry standards and patented electrical system methods.
Can you assist with sustainable building certifications?
Our team includes LEED-certified professionals who provide energy modeling, compliance documentation, and renewable energy system design.
Where are your offices located?
Our headquarters are in Oakland with branch offices in San Francisco and San Jose, serving Northern California clients.
