(314) 238.2040
12 Sunnen Dr., St. 100 St. Louis, MO 63143


M/E 1 was founded to provide the highest level of engineering design, return on investment and customer attention we could deliver. Our talented staff recognizes that businesses continuously grow and with it their system requirements. As we focus on client input to design the systems that best meet their current needs, our ultimate goal is to design the solution for ongoing and future needs. We define our success by the success of our clients, and M/E 1 was designed to thrive.

Formed in 2019, M/E 1 is a specialized engineering group focusing on industries that require unique and complex solutions for mechanical, electrical, plumbing and structural needs. As a CD Companies subsidiary, M/E 1 combines decades of experience and specialized knowledge to maintain high standards in building design and produce efficient solutions for complex projects, all while staying on time and on budget.

With careers spanning over 30 years, M/E 1’s engineering experience covers a wide range of sectors including healthcare, hospitality, government, corporate offices and many more. With the backing of all the CD Companies subsidiaries, we are licensed in 49 states and the District of Columbia, with project experience that spans the U.S. coast-to-coast.

Our team can provide specialized engineering for buildings that require detailed and technical systems. We design and engineer systems that complement each unique building function. Our engineers and designers have extensive experience in conceptual design and development, specification and design, design feasibility, planning development, construction administration, performance criteria and forensic building evaluations.

Community Memorial Hospital - Staunton, IL - Aire Handling Unit (AHU)


Our leadership has maintained a reputation for excellence because of their attention to clients’ needs. We identified a new solution to our clients’ modern needs – M/E 1, a group for specialized, dedicated engineering expertise.

The benefit of experience.

Our clients expect their systems to last for decades. Though it may not be the cheapest option, we have the experience to select the best and most cost effective long-term solution that can support future growth.

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Personalized Solutions

We account for every discipline when designing your systems. Having multiple engineering specialties on staff, we are able to look at the building as a whole to build a cohesive integrated design. Whether your project is 2,000 or 200,000 SF, we have the staff and expertise to engineer the solution for you.

Trusted Professionals

80% of our work comes from repeat work and word of mouth referrals. We pride ourselves on our work and our relationships with clients and aim to be trusted advisers you can turn to for the most cost effective and efficient solution.

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Our Leadership

Tom Grassi, PE, LEED AP, BCxP

Mark Spalinger, PE

Mike Lee, PE

Sarah Bundy, CM-BIM